More tags. ASCII and c-style strings.

notes/.obsidian/plugins/obsidian-to-anki-plugin/data.json

@@ -78,29 +78,29 @@
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+    "encoding/ascii.md": "c01e50f96d0493d94dc4d520c0b6bb71",
+    "encoding/index.md": "071cfa6a5152efeda127b684f420d438",
+    "c/strings.md": "38f9cf9e2325565589f62e191221a83a"
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notes/_journal/2024-02-12.md

@@ -11,3 +11,4 @@ title: "2024-02-12"
 - [ ] Log Work Hours (Max 3 hours)
 
 * Read 삼 년 고개 (Three-Years Hill).
+* Notes on ASCII and C-style strings.

notes/algorithms/index.md

@@ -1,3 +1,5 @@
 ---
 title: Algorithms
+tags:
+  - algorithm
 ---

notes/bash/index.md

@@ -1,3 +1,5 @@
 ---
 title: Bash
+tags:
+  - bash
 ---

notes/binary/index.md

@@ -1,3 +1,5 @@
 ---
 title: Binary
+tags:
+  - binary
 ---

notes/c/index.md

@@ -1,3 +1,5 @@
 ---
 title: C
+tags:
+  - c
 ---

notes/c/strings.md

@@ -0,0 +1,47 @@
+---
+title: Strings
+TARGET DECK: Obsidian::STEM
+FILE TAGS: c
+tags:
+  - c
+---
+
+## Overview
+
+A contiguous sequence of characters terminated by the `NUL` character (refer to [[ascii|ASCII]]). Text data is said to be more platform-independent than [[endianness|binary]] data since it is unaffected by word size or byte ordering.
+
+%%ANKI
+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.
+<!--ID: 1707758281264-->
+END%%
+
+%%ANKI
+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.
+<!--ID: 1707758281266-->
+END%%
+
+%%ANKI
+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.
+<!--ID: 1707758281268-->
+END%%
+
+%%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.
+<!--ID: 1707758281270-->
+END%%
+
+## References
+
+* Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.

notes/encoding/ascii.md

@@ -0,0 +1,92 @@
+---
+title: ASCII
+TARGET DECK: Obsidian::STEM
+FILE TAGS: encoding::ascii
+tags:
+  - encoding
+  - ascii
+---
+
+## Overview
+
+A character encoding containing 128 code points, 95 of which are printable. Use the Unix command `ascii` to print out the following table:
+
+```text
+Dec Hex    Dec Hex    Dec Hex  Dec Hex  Dec Hex  Dec Hex   Dec Hex   Dec Hex
+  0 00 NUL  16 10 DLE  32 20    48 30 0  64 40 @  80 50 P   96 60 `  112 70 p
+  1 01 SOH  17 11 DC1  33 21 !  49 31 1  65 41 A  81 51 Q   97 61 a  113 71 q
+  2 02 STX  18 12 DC2  34 22 "  50 32 2  66 42 B  82 52 R   98 62 b  114 72 r
+  3 03 ETX  19 13 DC3  35 23 #  51 33 3  67 43 C  83 53 S   99 63 c  115 73 s
+  4 04 EOT  20 14 DC4  36 24 $  52 34 4  68 44 D  84 54 T  100 64 d  116 74 t
+  5 05 ENQ  21 15 NAK  37 25 %  53 35 5  69 45 E  85 55 U  101 65 e  117 75 u
+  6 06 ACK  22 16 SYN  38 26 &  54 36 6  70 46 F  86 56 V  102 66 f  118 76 v
+  7 07 BEL  23 17 ETB  39 27 '  55 37 7  71 47 G  87 57 W  103 67 g  119 77 w
+  8 08 BS   24 18 CAN  40 28 (  56 38 8  72 48 H  88 58 X  104 68 h  120 78 x
+  9 09 HT   25 19 EM   41 29 )  57 39 9  73 49 I  89 59 Y  105 69 i  121 79 y
+ 10 0A LF   26 1A SUB  42 2A *  58 3A :  74 4A J  90 5A Z  106 6A j  122 7A z
+ 11 0B VT   27 1B ESC  43 2B +  59 3B ;  75 4B K  91 5B [  107 6B k  123 7B {
+ 12 0C FF   28 1C FS   44 2C ,  60 3C <  76 4C L  92 5C \  108 6C l  124 7C |
+ 13 0D CR   29 1D GS   45 2D -  61 3D =  77 4D M  93 5D ]  109 6D m  125 7D }
+ 14 0E SO   30 1E RS   46 2E .  62 3E >  78 4E N  94 5E ^  110 6E n  126 7E ~
+ 15 0F SI   31 1F US   47 2F /  63 3F ?  79 4F O  95 5F _  111 6F o  127 7F DEL
+```
+
+%%ANKI
+Basic
+What is a character encoding?
+Back: The assignment of numbers to graphical characters.
+Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
+<!--ID: 1707757786284-->
+END%%
+
+%%ANKI
+Basic
+How many code points are defined in ASCII?
+Back: 128
+Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
+<!--ID: 1707757786288-->
+END%%
+
+%%ANKI
+Basic
+How many *printable* code points are defined in ASCII?
+Back: 95
+Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
+<!--ID: 1707757786289-->
+END%%
+
+%%ANKI
+Basic
+What program can be used to print an ASCII table to the console?
+Back: `ascii`
+Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
+<!--ID: 1707757786291-->
+END%%
+
+%%ANKI
+Basic
+How many bits make up an ASCII character?
+Back: `7`
+Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
+<!--ID: 1707757786292-->
+END%%
+
+%%ANKI
+Basic
+What is the largest ASCII decimal value?
+Back: `127`
+Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
+<!--ID: 1707757786294-->
+END%%
+
+%%ANKI
+Basic
+What is the largest ASCII hexadecimal value?
+Back: `0x7F`
+Reference: Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.
+<!--ID: 1707757786295-->
+END%%
+
+## References
+
+* Bryant, Randal E., and David O'Hallaron. *Computer Systems: A Programmer's Perspective*. Third edition, Global edition. Always Learning. Pearson, 2016.

notes/encoding/index.md

@@ -0,0 +1,5 @@
+---
+title: Encoding
+tags:
+  - encoding
+---

notes/gawk/variables.md

@@ -213,6 +213,36 @@ Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 202
 <!--ID: 1707618833558-->
 END%%
 
+%%ANKI
+Cloze
+Setting `FS` to {`""`} allows examining {each character of a record separately}.
+Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
+<!--ID: 1707756447064-->
+END%%
+
+%%ANKI
+Cloze
+Setting `FS` to {`"\n"`} treats the {record as the single field}.
+Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
+<!--ID: 1707756447067-->
+END%%
+
+%%ANKI
+Basic
+What value of `FS` ensures `$1 = $0`?
+Back: `"\n"`
+Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
+<!--ID: 1707756447069-->
+END%%
+
+%%ANKI
+Basic
+*Why* does `awk` support a CSV mode?
+Back: Because CSV fields may contain commas and newlines.
+Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
+<!--ID: 1707756447071-->
+END%%
+
 ## References
 
 * Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)

notes/logic/index.md

@@ -1,3 +1,5 @@
 ---
 title: Logic
+tags:
+  - logic
 ---

notes/lua/index.md

@@ -1,3 +1,5 @@
 ---
 title: Lua
+tags:
+  - lua
 ---

notes/nix/index.md

@@ -1,3 +1,5 @@
 ---
 title: Nix
+tags:
+  - nix
 ---

notes/posix/index.md

@@ -1,3 +1,5 @@
 ---
 title: POSIX
+tags:
+  - posix
 ---