fix Makefile and README.md for 2015/burton
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Landon Curt Noll committed
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@@ -102,8 +102,8 @@ CINCLUDE=
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#CINCLUDE= -include stdlib.h
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#CINCLUDE= -include stdio.h
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#CINCLUDE= -include stdlib.h -include stdio.h
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#CINCLUDE= -I ${X11_INCDIR}
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#CINCLUDE= -I ${HOMEBREW_PREFIX}/include/SDL2
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#CINCLUDE= -I ${X11_INCDIR} -I ${X11_INCDIR}/X11
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#CINCLUDE= `${SDL2_CONFIG} --cflags`
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# Optimization
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#
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@@ -188,14 +188,14 @@ all: data ${TARGET}
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${PROG}: ${PROG}.c
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${CC} ${CFLAGS} $< -o $@ ${LIBS}
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${PROG}.alt: ${PROG}.alt.c
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${CC} ${CFLAGS} $< -o $@ ${LIBS}
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# alternative executable
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#
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alt: data ${ALT_TARGET}
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@${TRUE}
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${PROG}.alt: ${PROG}.alt.c
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${CC} ${CFLAGS} $< -o $@ ${LIBS}
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# data files
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#
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data: ${DATA}
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+54
-47
@@ -1,52 +1,68 @@
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# Most Useful
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Dave Burton <ioccc@snox.net>
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<http://snox.net/ioccc>
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Dave Burton <ioccc@snox.net>
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<http://snox.net/ioccc>
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## To build:
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# To build:
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make all
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```sh
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make
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```
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### To run
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### To run:
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./prog "expression"
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```sh
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./prog "expression"
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```
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or
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or:
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```sh
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./prog
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```
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Type in expressions on standard input.
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./prog
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(input expressions)
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### Try:
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./prog '?0x3343<<2'
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```sh
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./prog '?0x3343<<2'
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echo '?0x3343<<2' | ./prog
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echo '?0x3343<<2' | ./prog
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./prog
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./prog
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```
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Enter:
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Enter:
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a=0xfeedface
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b=0xcafe
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a << 16 + b
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```sh
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a=0xfeedface
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b=0xcafe
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a << 16 + b
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```
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grep '[0-9]' prog.c
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```sh
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grep '[0-9]' prog.c
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./prog < test.in
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./prog < test.in
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man ./calc.man
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man ./calc.man
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```
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## Alternate code
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An alternate version of this entry, prog.alt.c, is provided. This alternate code is discussed in the "prog.c vs prog.alt.c" section of the author's comments below.
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An alternate version of this entry, `prog.alt.c`, is provided.
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This alternate code is discussed in the "prog.c vs prog.alt.c" section of the author's comments below.
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To compile this alternate version:
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make alt
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```sh
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make alt
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```
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Use `prog.alt` as you would `prog` above.
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### Selected Judges Remarks:
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## Judges' comments:
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"Look, Ma, no ~~hands~~ digits!"
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@@ -57,14 +73,12 @@ We were impressed with the level of detail the author "blogged" the obfuscation
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## Author's comments:
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calc - an integer expression calculator that outputs in both hex and decimal
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----------------------------------------------------------------------------
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### calc - an integer expression calculator that outputs in both hex and decimal
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All useful tools should include sufficient documentation.
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See the included man page. ;-)
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Notes
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-----
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### Notes
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This program is named calc. Onomatopoeia of sorts, in the visual realm.
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The formatting was easier: Form Follows Function (although [Hou][1] did this better).
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@@ -75,8 +89,7 @@ Printed in 8 pt Courier, it makes aesthetically pleasing 8.5 x 11 wall art.
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[1]: http://www.ioccc.org/2011/hou/hint.html "Hou Qiming"
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prog.c vs prog.alt.c
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---------------------
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### prog.c vs prog.alt.c
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Dominik Muth observed a syntax error on `1+1`, `1-1`, `1|1`, and `1^1` when using an
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ARM based computer, although `1*1` and others worked correctly.
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@@ -85,8 +98,7 @@ The original code has this weakness, which can be corrected by adding `-fsigned-
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to the compile line.
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The modified code is agnostic to `char` signed-ness.
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Why is this entry obfuscated/interesting?
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-----------------------------------------
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### Why is this entry obfuscated/interesting?
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Yes, this is another calculator program.
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@@ -99,7 +111,7 @@ Nor are the digits simply obfuscated. There are no character constants.
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There is only one single, short string, and it does not contain any obfuscated digits.
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And yet the output is in decimal and hexadecimal, and it accepts octal, decimal, and hex input.
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Flow control is by `for` and `return`. It is If-less. Switch-less. While-less. Hope-less.
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Flow control is by `for` and `return`. It is If-less. Switch-less. While-less. Hope-less.
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Literally, if not figuratively. ;-)
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The code size is intentionally 2015, as stated by iocccsize -i,
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@@ -109,8 +121,7 @@ Finally, calc is interesting, if for no other reason than it is practically usef
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Hex/decimal conversion, arithmetic, byte-swapping, bit-shifting, and logical operations with memory,
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on the command line, or interactively.
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But the question is why is the entry obfuscated?
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------------------------------------------------
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### But the question is why is the entry obfuscated?
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The code follows many industry best-practices:
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@@ -160,8 +171,7 @@ The code follows many industry best-practices:
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But isn't it unsportsmanlike to rely upon it? However, even with this helpful guide,
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things like reading input lines remain as tricky to read as they are to write.
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Compiler warnings
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-----------------
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### Compiler warnings
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Calc is C99 compliant, and is ANSI/C90 compliant except for wanting 64-bit `long long`.
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Changing the two `long long` typedefs to `long`, and compiling with `gcc -m32`
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@@ -179,16 +189,15 @@ To stifle these complaints:
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When invoked with -ansi -pedantic, there are two warnings, which can be ignored:
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* `ISO C90 does not support 'long long'`
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* `ISO C90 does not support 'long long'`
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With -Wall -std=c99, both are quite noisy, and all can be ignored:
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* `array subscript has type 'char' [-Wchar-subscripts]`
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* `value computed is not used [-Wunused-value]`
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* `operation on 'j' may be undefined [-Wsequence-point]`
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* `array subscript has type 'char' [-Wchar-subscripts]`
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* `value computed is not used [-Wunused-value]`
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* `operation on 'j' may be undefined [-Wsequence-point]`
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Test Suite
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----------
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### Test Suite
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If the program name begins with an "e", it echoes stdin to stdout.
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This allows for a convenient test suite:
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@@ -196,16 +205,14 @@ This allows for a convenient test suite:
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ln -s prog eprog
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PATH=. eprog < test.in | diff - test.out
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Spoilers
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--------
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### Spoilers
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If you do not want to puzzle out how it works, see spoilers.markdown.
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--------------------------------------------------------------------------------
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<!--
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## Copyright:
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(c) Copyright 1984-2016, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved
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This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc].
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[judges]: http://www.ioccc.org/judges.html
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[cc]: http://creativecommons.org/licenses/by-sa/3.0/
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-->
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