C conversions.

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Joshua Potter 2024-09-05 19:27:23 -06:00
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* Notes on C's [[conversions#Usual Arithmetic Conversions|usual arithmetic conversions]].

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* Notes on C [[c17/declarations#Initializers|initializers]].

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@ -55,7 +55,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What C logical operator corresponds to $\land$? What C logical operator corresponds to $\land$?
Back: N/A Back: N/A.
Reference: Gries, David. *The Science of Programming*. Texts and Monographs in Computer Science. New York: Springer-Verlag, 1981. Reference: Gries, David. *The Science of Programming*. Texts and Monographs in Computer Science. New York: Springer-Verlag, 1981.
Tags: c17 Tags: c17
<!--ID: 1706994861327--> <!--ID: 1706994861327-->
@ -64,7 +64,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What C logical operator corresponds to $\lor$? What C logical operator corresponds to $\lor$?
Back: N/A Back: N/A.
Reference: Gries, David. *The Science of Programming*. Texts and Monographs in Computer Science. New York: Springer-Verlag, 1981. Reference: Gries, David. *The Science of Programming*. Texts and Monographs in Computer Science. New York: Springer-Verlag, 1981.
Tags: c17 Tags: c17
<!--ID: 1706994861329--> <!--ID: 1706994861329-->
@ -73,7 +73,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What C logical operator corresponds to $\Rightarrow$? What C logical operator corresponds to $\Rightarrow$?
Back: N/A Back: N/A.
Reference: Gries, David. *The Science of Programming*. Texts and Monographs in Computer Science. New York: Springer-Verlag, 1981. Reference: Gries, David. *The Science of Programming*. Texts and Monographs in Computer Science. New York: Springer-Verlag, 1981.
Tags: c17 Tags: c17
<!--ID: 1706994861331--> <!--ID: 1706994861331-->

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@ -323,8 +323,99 @@ Reference: Van der Linden, Peter. _Expert C Programming: Deep C Secrets_. Progra
<!--ID: 1722786892125--> <!--ID: 1722786892125-->
END%% END%%
## Initializers
An **initializer** is an expression that gives an object a value at time of declaration. Only variable-length arrays (VLAs) do not allow for an initializer. The default initializer looks like `{0}`.
%%ANKI
Basic
Which part of the following are initializers?
```c
int a = 3;
```
Back: `3`
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196021580-->
END%%
%%ANKI
Basic
Which part of the following are initializers?
```c
double a = { 7.0 };
```
Back: `{ 7.0 }`
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196021585-->
END%%
%%ANKI
Basic
Which part of the following are initializers?
```c
double a = { 7.0 };
```
Back: `{ 7.0 }`
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
END%%
%%ANKI
Basic
How is the following updated to include initializers `1` and `2` for `a` and `b` respectively?
```c
int a, b;
```
Back:
```c
int a = 1, b = 2;
```
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196021590-->
END%%
%%ANKI
Basic
What object types allow initializers?
Back: All but VLAs.
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196021576-->
END%%
%%ANKI
Basic
What object types do not allow initializers?
Back: Just variable-length arrays.
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196021596-->
END%%
%%ANKI
Basic
What is the default initializer?
Back: `{0}`
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196290195-->
END%%
%%ANKI
Basic
`{0}` is a valid initializer for what object types?
Back: All but VLAs.
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196290203-->
END%%
%%ANKI
Basic
`{0}` is not a valid initializer for what object types?
Back: Just variable-length arrays.
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196290208-->
END%%
## Bibliography ## Bibliography
* Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. * Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
* “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf). * “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
* Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
* Van der Linden, Peter. _Expert C Programming: Deep C Secrets_. Programming Languages / C. Mountain View, Cal.: SunSoft Pr, 1994. * Van der Linden, Peter. _Expert C Programming: Deep C Secrets_. Programming Languages / C. Mountain View, Cal.: SunSoft Pr, 1994.

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@ -107,7 +107,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
Why are lvalues named the way they are? Why are lvalues named the way they are?
Back: The name is an acronym for **l**ocator **value**. Back: The name is an acronym for **l**ocator **value** (or **l**eft **value**).
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf). Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1723510994878--> <!--ID: 1723510994878-->
END%% END%%

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@ -0,0 +1,302 @@
---
title: Conversions
TARGET DECK: Obsidian::STEM
FILE TAGS: c17::type
tags:
- c17
---
## Overview
> Several operators convert operand values from one type to another automatically.
The above quote refers to **implicit conversions**. Alternatively, we can use cast operations to perform **explicit conversions**.
## Usual Arithmetic Conversions
As a general rule, the result of an operation has the type of the operand with wider range. The usual arithmetic conversions behave according to the following pattern:
1. Determine a **common real type** for the operands and result.
2. Convert each operand, without change of type domain, to a type with real type matching the common real type.
3. Unless explicitly stated otherwise, the common real type is the corresponding real type of the result, whose type domain is that of the operands if they are the same and complex otherwise.
Common real types are prioritized in the following order:
1. `long double`
2. `double`
3. `float`
4. If both operands have the same signedness, the higher ranked type.
5. If the unsigned operand has rank $\geq$ than that of the other, the unsigned type.
6. If the signed operand's includes that of the other, the signed type.
7. The unsigned integer type corresponding to that of the signed integer type.
%%ANKI
Basic
What is the common real type of `a` and `b`?
```c
long double a;
long double complex b;
```
Back: `long double`
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203391-->
END%%
%%ANKI
Basic
What is the common real type of `a` and `b`?
```c
long double a;
long complex b;
```
Back: `long double`
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203395-->
END%%
%%ANKI
Basic
What is the type domain of `a + b`?
```c
long double a;
long complex b;
```
Back: Complex.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203398-->
END%%
%%ANKI
Basic
What is the common real type of `a` and `b`?
```c
double complex a;
long b;
```
Back: `double`
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203402-->
END%%
%%ANKI
Basic
What is the type domain of `a + b`?
```c
long double a;
long complex b;
```
Back: Complex.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
END%%
%%ANKI
Basic
What is the common real type of `a` and `b`?
```c
float a;
double b;
```
Back: `double`
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203405-->
END%%
%%ANKI
Basic
What is the common real type of `a` and `b`?
```c
long long a;
float b;
```
Back: `float`
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203408-->
END%%
%%ANKI
Basic
What is the type domain of `a + b`?
```c
long long a;
float b;
```
Back: Real.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203419-->
END%%
%%ANKI
Basic
*Why* is the common real type of `a` and `b` equal to `float`?
```c
long long a;
float b;
```
Back: Because floating-point types have priority over integer types.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203427-->
END%%
%%ANKI
Basic
What is the type domain of `a + b`?
```c
long long a;
long long b;
```
Back: Real.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203431-->
END%%
%%ANKI
Basic
What is the common real type of `a` and `b`?
```c
long long a;
long long b;
```
Back: `long long`
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203436-->
END%%
%%ANKI
Basic
What is the common real type of `a` and `b`?
```c
unsigned int a;
signed short b;
```
Back: `unsigned int`
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203440-->
END%%
%%ANKI
Basic
What is the common real type of `a` and `b`?
```c
unsigned a;
signed int b;
```
Back: `unsigned`
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203445-->
END%%
%%ANKI
Basic
*Why* is the common real type of `a` and `b` equal to `unsigned`?
```c
unsigned a;
signed int b;
```
Back: Because `unsigned` has rank $\geq$ that of `signed int`.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203450-->
END%%
%%ANKI
Basic
What is the type domain of `a + b`?
```c
unsigned a;
signed int b;
```
Back: Real.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203454-->
END%%
%%ANKI
Basic
What is the type domain of `a + b`?
```c
unsigned short a;
signed int b;
```
Back: Indeterminate.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203469-->
END%%
%%ANKI
Basic
*Why* is the type domain of `a + b` indeterminate?
```c
unsigned short a;
int b;
```
Back: Because the rank of `unsigned short` is $<$ that of `int`.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203475-->
END%%
%%ANKI
Basic
What *might* the type domain of `a + b` be?
```c
unsigned short a;
signed int b;
```
Back: `signed int` or `unsigned int`.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203479-->
END%%
%%ANKI
Basic
When is the type domain of `a + b` equal to `signed int`?
```c
unsigned short a;
signed int b;
```
Back: When `signed int` can represent all the values of `unsigned short`.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203484-->
END%%
%%ANKI
Basic
When is the type domain of `a + b` equal to `unsigned int`?
```c
unsigned short a;
signed int b;
```
Back: When `signed int` cannot represent all the values of `unsigned short`.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203488-->
END%%
%%ANKI
Basic
When is the type domain of `a + b` equal to `unsigned short`?
```c
unsigned short a;
signed int b;
```
Back: N/A. It never is.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203492-->
END%%
%%ANKI
Basic
Suppose `a` and `b` has signed and unsigned types. When is `a + b` signed?
Back: When `b`'s type has lower rank and the range of `b` is included in the range of `a`.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203460-->
END%%
%%ANKI
Basic
Suppose `a` and `b` has signed and unsigned types. When is `a + b` unsigned?
Back: When `b`'s type has higher rank or the range of `a` cannot fit the range of `b`.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724762203465-->
END%%
## Bibliography
* “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).

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@ -124,6 +124,39 @@ Reference: ISO: Programming Languages - C,” April 12, 2011, [https://port70.ne
<!--ID: 1723510995023--> <!--ID: 1723510995023-->
END%% END%%
%%ANKI
Basic
Does `x` have complete or incomplete object type in the following?
```c
double x[];
```
Back: Incomplete.
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196021563-->
END%%
%%ANKI
Basic
Does `x` have complete or incomplete object type in the following?
```c
double x[] = { 1, 2, };
```
Back: Incomplete.
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196021568-->
END%%
%%ANKI
Basic
Does `x` have complete or incomplete object type in the following?
```c
double x[2] = { 1, 2, };
```
Back: Complete.
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1725196021572-->
END%%
%%ANKI %%ANKI
Basic Basic
What object type can an lvalue *not* have? What object type can an lvalue *not* have?
@ -199,7 +232,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
The integer types consist of what simple types? The integer types consist of what simple types?
Back: `char`, signed/unsigned integer types, and `enum`s. Back: `char`, (un)signed integer types, and `enum`s.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf). Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724546734436--> <!--ID: 1724546734436-->
END%% END%%
@ -255,7 +288,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
Which types are considered both basic types and integer types? Which types are considered both basic types and integer types?
Back: `char` and the signed/unsigned integer types. Back: `char` and the (un)signed integer types.
Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf). Reference: “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
<!--ID: 1724546734469--> <!--ID: 1724546734469-->
END%% END%%
@ -392,4 +425,5 @@ END%%
## Bibliography ## Bibliography
* “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf). * “ISO: Programming Languages - C,” April 12, 2011, [https://port70.net/~nsz/c/c11/n1570.pdf](https://port70.net/~nsz/c/c11/n1570.pdf).
* Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).

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@ -452,14 +452,6 @@ Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co
<!--ID: 1723937852091--> <!--ID: 1723937852091-->
END%% END%%
%%ANKI
Basic
The first fit rule excludes what subcategory of integer types?
Back: The narrow integers.
Reference: Jens Gustedt, _Modern C_ (Shelter Island, NY: Manning Publications Co, 2020).
<!--ID: 1724506993429-->
END%%
%%ANKI %%ANKI
Basic Basic
What is the signedness of a decimal integer literal? What is the signedness of a decimal integer literal?

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@ -111,7 +111,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What is the maximum element of interval $[0, 1] \subseteq \mathbb{R}$? What is the maximum element of interval $[0, 1] \subseteq \mathbb{R}$?
Back: $1$. Back: $1$
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115133094--> <!--ID: 1724115133094-->
END%% END%%
@ -143,7 +143,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What is the minimum element of interval $[0, 1] \subseteq \mathbb{R}$? What is the minimum element of interval $[0, 1] \subseteq \mathbb{R}$?
Back: $0$. Back: $0$
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115133106--> <!--ID: 1724115133106-->
END%% END%%
@ -203,7 +203,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What distinguishes a supremum from a least upper bound? What distinguishes a supremum from a least upper bound?
Back: They are synonyms of one another. Back: N/A. They are synonyms of one another.
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115953346--> <!--ID: 1724115953346-->
END%% END%%
@ -219,7 +219,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What is the least upper bound of interval $[0, 1] \subseteq \mathbb{R}$? What is the least upper bound of interval $[0, 1] \subseteq \mathbb{R}$?
Back: $1$. Back: $1$
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115953358--> <!--ID: 1724115953358-->
END%% END%%
@ -227,7 +227,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What is the supremum of interval $(0, 1) \subseteq \mathbb{R}$? What is the supremum of interval $(0, 1) \subseteq \mathbb{R}$?
Back: $1$. Back: $1$
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115953364--> <!--ID: 1724115953364-->
END%% END%%
@ -307,7 +307,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
Let $A, B \subseteq \mathbb{R}$. When is $\mathop{\text{sup}} \,\{a + b \mid a \in A, b \in B\}$ defined? Let $A, B \subseteq \mathbb{R}$. When is $\mathop{\text{sup}} \,\{a + b \mid a \in A, b \in B\}$ defined?
Back: When $A$ and $B$ both have a supremum. Back: When $A$ and $B$ both have supremums.
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724523640377--> <!--ID: 1724523640377-->
END%% END%%
@ -315,7 +315,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
Let $A, B \subseteq \mathbb{R}$. When is $\mathop{\text{inf}} \,\{a + b \mid a \in A, b \in B\}$ defined? Let $A, B \subseteq \mathbb{R}$. When is $\mathop{\text{inf}} \,\{a + b \mid a \in A, b \in B\}$ defined?
Back: When $A$ and $B$ both have an infimum. Back: When $A$ and $B$ both have infimums.
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724523640378--> <!--ID: 1724523640378-->
END%% END%%
@ -383,7 +383,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
Consider $\varnothing \subseteq \mathbb{R}$. Why doesn't the completeness axiom of real numbers apply? Consider $\varnothing \subseteq \mathbb{R}$. Why doesn't the completeness axiom of real numbers apply?
Back: It only applies to nonempty sets. Back: $\varnothing$ is not a nonempty set.
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724116323044--> <!--ID: 1724116323044-->
END%% END%%
@ -399,7 +399,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
Consider $\mathbb{R}^+$. Why doesn't the completeness axiom apply? Consider $\mathbb{R}^+$. Why doesn't the completeness axiom apply?
Back: It only applies to nonempty sets that are bounded above. Back: $\mathbb{R}^+$ is not bounded above.
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724116323049--> <!--ID: 1724116323049-->
END%% END%%
@ -426,7 +426,7 @@ A number $B$ is called a **greatest lower bound** (or **infimum**) of a nonempty
%%ANKI %%ANKI
Basic Basic
Let $\varnothing \subset S \subseteq \mathbb{R}$. What is a greatest upper bound of $S$? Let $\varnothing \subset S \subseteq \mathbb{R}$. What is a greatest lower bound of $S$?
Back: A lower bound $B$ for $S$ such that no number greater than $B$ is also a lower bound for $S$. Back: A lower bound $B$ for $S$ such that no number greater than $B$ is also a lower bound for $S$.
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115953392--> <!--ID: 1724115953392-->
@ -459,7 +459,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What distinguishes a greatest lower bound from an infimum? What distinguishes a greatest lower bound from an infimum?
Back: They are synonyms of one another. Back: N/A. They are synonyms of one another.
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115953417--> <!--ID: 1724115953417-->
END%% END%%
@ -467,7 +467,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What distinguishes an infimum from a minimum? What distinguishes an infimum from a minimum?
Back: A supremum is not necessarily a member of the reference set. Back: An infimum is not necessarily a member of the reference set.
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115953422--> <!--ID: 1724115953422-->
END%% END%%
@ -475,7 +475,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What is the infimum of interval $[0, 1] \subseteq \mathbb{R}$? What is the infimum of interval $[0, 1] \subseteq \mathbb{R}$?
Back: $0$. Back: $0$
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115953428--> <!--ID: 1724115953428-->
END%% END%%
@ -483,7 +483,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
What is the greatest lower bound of interval $(0, 1) \subseteq \mathbb{R}$? What is the greatest lower bound of interval $(0, 1) \subseteq \mathbb{R}$?
Back: $0$. Back: $0$
Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980). Reference: Tom M. Apostol, _Calculus, Vol. 1: One-Variable Calculus, with an Introduction to Linear Algebra_, 2nd ed. (New York: Wiley, 1980).
<!--ID: 1724115953433--> <!--ID: 1724115953433-->
END%% END%%

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@ -132,7 +132,7 @@ END%%
%%ANKI %%ANKI
Basic Basic
Consider a B-tree of order $7$. How many children $c$ can each non-root node have? Consider a B-tree of order $7$. How many children $c$ can each internal non-root node have?
Back: $4 \leq c \leq 7$ Back: $4 \leq c \leq 7$
Reference: Donald Ervin Knuth, _Art of Computer Programming, 3: Sorting and Searching_, 2. ed., 34. (Reading, Mass: Addison-Wesley, 1995). Reference: Donald Ervin Knuth, _Art of Computer Programming, 3: Sorting and Searching_, 2. ed., 34. (Reading, Mass: Addison-Wesley, 1995).
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Basic Basic
Consider a B-tree of order $7$. How many children $c$ can the root have? Consider a B-tree of order $7$. How many children $c$ can the root have?
Back: $1 \leq c \leq 7$ Back: $0 \leq c \leq 7$
Reference: Donald Ervin Knuth, _Art of Computer Programming, 3: Sorting and Searching_, 2. ed., 34. (Reading, Mass: Addison-Wesley, 1995). Reference: Donald Ervin Knuth, _Art of Computer Programming, 3: Sorting and Searching_, 2. ed., 34. (Reading, Mass: Addison-Wesley, 1995).
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%%ANKI %%ANKI
Basic Basic
Consider a B-tree of order $7$. How many keys $k$ can each non-root node have? Consider a B-tree of order $7$. How many keys $k$ can each internal non-root node have?
Back: $3 \leq k < 7$ Back: $3 \leq k < 7$
Reference: Donald Ervin Knuth, _Art of Computer Programming, 3: Sorting and Searching_, 2. ed., 34. (Reading, Mass: Addison-Wesley, 1995). Reference: Donald Ervin Knuth, _Art of Computer Programming, 3: Sorting and Searching_, 2. ed., 34. (Reading, Mass: Addison-Wesley, 1995).
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Basic Basic
What does the Church-Rosser theorem state in terms of confluence? What does the Church-Rosser theorem of $\,\triangleright_\beta\,$ state in terms of confluence?
Back: $\beta$-reduction is confluent. Back: $\beta$-reduction is confluent.
Reference: Hindley, J Roger, and Jonathan P Seldin. “Lambda-Calculus and Combinators, an Introduction,” n.d. [https://www.cin.ufpe.br/~djo/files/Lambda-Calculus%20and%20Combinators.pdf](https://www.cin.ufpe.br/~djo/files/Lambda-Calculus%20and%20Combinators.pdf). Reference: Hindley, J Roger, and Jonathan P Seldin. “Lambda-Calculus and Combinators, an Introduction,” n.d. [https://www.cin.ufpe.br/~djo/files/Lambda-Calculus%20and%20Combinators.pdf](https://www.cin.ufpe.br/~djo/files/Lambda-Calculus%20and%20Combinators.pdf).
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Basic Basic
Do all multisets correspond to sets? Is every multiset a set?
Back: No. Back: No.
Reference: “Multiset,” in _Wikipedia_, April 4, 2024, [https://en.wikipedia.org/w/index.php?title=Multiset&oldid=1217165725](https://en.wikipedia.org/w/index.php?title=Multiset&oldid=1217165725). Reference: “Multiset,” in _Wikipedia_, April 4, 2024, [https://en.wikipedia.org/w/index.php?title=Multiset&oldid=1217165725](https://en.wikipedia.org/w/index.php?title=Multiset&oldid=1217165725).
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Basic Basic
Do all sets correspond to multisets? Is every set a multiset?
Back: Yes. Back: Yes.
Reference: “Multiset,” in _Wikipedia_, April 4, 2024, [https://en.wikipedia.org/w/index.php?title=Multiset&oldid=1217165725](https://en.wikipedia.org/w/index.php?title=Multiset&oldid=1217165725). Reference: “Multiset,” in _Wikipedia_, April 4, 2024, [https://en.wikipedia.org/w/index.php?title=Multiset&oldid=1217165725](https://en.wikipedia.org/w/index.php?title=Multiset&oldid=1217165725).
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Cloze Cloze
$\exists u \in A, uFx$ is equivalently written as $x \in$ {$\{v \mid \exists u \in A, uFv\}$}. $\exists u \in A, uFx$ is equivalently written as $x \in$ {$F[\![A]\!]$}.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977). Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
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Cloze Cloze
The {infinity axiom} asserts the existence of an {inductive set}. The {infinity} axiom asserts the existence of an {inductive set}.
Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977). Reference: Herbert B. Enderton, *Elements of Set Theory* (New York: Academic Press, 1977).
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Basic Basic
How many bytes make up the `%rax` register? How many bytes make up the `%rax` register?
Back: $8$. Back: $8$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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Basic Basic
How many bytes make up the `%ax` register? How many bytes make up the `%ax` register?
Back: $2$. Back: $2$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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Basic Basic
How many bytes make up the `%al` register? How many bytes make up the `%al` register?
Back: $1$. Back: $1$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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%%ANKI %%ANKI
Basic Basic
How many bytes make up the `%eax` register? How many bytes make up the `%eax` register?
Back: $4$. Back: $4$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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%%ANKI %%ANKI
Basic Basic
How many bytes make up the `%rsp` register? How many bytes make up the `%rsp` register?
Back: $8$. Back: $8$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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%%ANKI %%ANKI
Basic Basic
How many bytes make up the `%sp` register? How many bytes make up the `%sp` register?
Back: $2$. Back: $2$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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END%% END%%
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%%ANKI %%ANKI
Basic Basic
How many bytes make up the `%spl` register? How many bytes make up the `%spl` register?
Back: $1$. Back: $1$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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%%ANKI %%ANKI
Basic Basic
How many bytes make up the `%esp` register? How many bytes make up the `%esp` register?
Back: $4$. Back: $4$
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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Basic Basic
From smallest to largest, list the four "return value" registers. From smallest to largest, list the four "return value" registers.
Back: `%al`, `%ax`, `%eax`, and `$rax`. Back: `%al`, `%ax`, `%eax`, and `%rax`.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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Basic Basic
From smallest to largest, list the four "stack pointer" registers. From smallest to largest, list the four "stack pointer" registers.
Back: `%spl`, `%sp`, `%esp`, and `$rsp`. Back: `%spl`, `%sp`, `%esp`, and `%rsp`.
Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016. Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
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