13 KiB
| title | TARGET DECK | FILE TAGS | tags | |
|---|---|---|---|---|
| Strings | Obsidian::STEM | c |
|
Overview
A contiguous sequence of characters terminated by the NUL character (refer to ascii). Text data is said to be more platform-independent than endianness data since it is unaffected by word size or byte ordering.
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Basic
What is a C-style string?
Back: A character array terminated with a NUL character.
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
What character terminates all C-style strings?
Back: NUL
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
What is the decimal value of NUL in ASCII encoding?
Back: 0
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 Basic Text is more platform-independent than binary because it is unaffected by what two properties? Back: Word size and byte ordering. 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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printf
The syntax for the format placeholder is %[flags][width][.precision][length]specifier.
| Flag | Description |
|---|---|
- |
Left-aligns the output |
+ |
Prepends a plus for positive signed-numeric types |
␣ |
Prepends a space for positive signed-numeric types |
0 |
Prepends zeros for numeric types |
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Cloze
The {-} flag {left-aligns the output}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Basic
The - flag overrides what default behavior?
Back: Output is right-aligned by default.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Cloze
The {+} flag {prepends a plus for positive signed-numeric types}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Basic
The + flag overrides what default behavior?
Back: Nothing is prepended to positive signed-numeric types by default.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Cloze
The {␣} flag {prepends a space for positive signed-numeric types}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Basic
The ␣ flag overrides what default behavior?
Back: Nothing is prepended to positive signed-numeric types by default.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Basic
How do the + and ␣ flags relate to one another?
Back: Both prepend a character to positive signed-numeric types.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Basic
What happens if both the + and ␣ flags are specified?
Back: The + flag takes precedence.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Cloze
The {0} flag {prepends zeros for numeric types}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Basic
What option must be specified for the 0 flag to take effect?
Back: The "width" option.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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Basic
The 0 flag overrides what default behavior?
Back: Spaces are used to match the "width" option by default.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
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| Specifier | Description |
|---|---|
d, i |
a decimal signed int |
u |
a decimal unsigned int |
x |
a hexadecimal unsigned int (lowercase) |
X |
a hexadecimal unsigned int (uppercase) |
o |
an octal unsigned int |
s |
a NUL-terminated string |
c |
a char character |
p |
void* address in an implementation-defined format |
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Basic
What character do printf format specifiers start with?
Back: %
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
Why is printf named the way it is?
Back: It stands for print formatted.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
The {d and i} format specifers output a {decimal signed int}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
{d and i} are to signed as {u} is to unsigned.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
The {u} format specifier outputs a {decimal unsigned int}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
What distinguishes format specifiers d and i?
Back: Nothing.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
Which format specifiers were probably used to yield printf output -12?
Back: d or i
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
What distinguishes format specifiers d and u?
Back: The former is for signed integers, the latter unsigned.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
The {x} format specifier outputs a {lowercase hexadecimal unsigned int}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
Which format specifier were probably used to yield printf output 7af?
Back: x
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
The {X} format specifier outputs an {uppercase hexadecimal unsigned int}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
Which format specifier were probably used to yield printf output 7AF?
Back: X
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
What distinguishes format specifiers x and X?
Back: The former outputs lowercase hex digits, the latter uppercase.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
The {o} format specifier outputs an {octal unsigned int}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
Why doesn't the o format specifier have a corresponding O specifier?
Back: There is no distinction between lower and uppercase octal digits.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
The {s} format specifiers outputs a {NUL-terminated string}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
Which format specifier was probably used to yield printf output abc?
Back: s
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
The {c} format specifier outputs a {char character}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
Which format specifier was probably used to yield printf output a?
Back: c
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Cloze
The {p} format specifier outputs a {void* address}.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
Which format specifier was probably used to yield printf output 0b80000000?
Back: p
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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Basic
How is the address outputted by the p format specifier written?
Back: In an implementation-specific way.
Reference: “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.
Tags: printf
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References
- Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
- “Printf,” in Wikipedia, January 18, 2024, https://en.wikipedia.org/w/index.php?title=Printf&oldid=1196716962.