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Category: C Questions

Obfuscated C Code Contest 2006. Please explain sykes2.c

Posted on September 1, 2017October 9, 2017 by TFE Times
Posted in C QuestionsTagged 2006, code, contest, explain, obfuscated, please, sykes2c
Obfuscated C Code Contest 2006. Please explain sykes2.c

How does this C program work? main(_){_^448&&main(-~_);putchar(--_%64?32|-~7[__TIME__-_/8%8][">'txiZ^(~z?"-48]>>";;;====~$::199"[_*2

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C Programming Tips

Posted on September 1, 2017April 2, 2018 by TFE Times
Posted in C QuestionsTagged c, Programming, TIPS
C Programming Tips

C is one of the most important and widely used of all programming languages. It is a powerful language that can be used not only to build general-purp

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Improve INSERT-per-second performance of SQLite?

Posted on September 1, 2017June 19, 2022 by TFE Times
Posted in C QuestionsTagged improve, insertpersecond, of, performance, sqlite
Improve INSERT-per-second performance of SQLite?

Optimizing SQLite is tricky. Bulk-insert performance of a C application can vary from 85 inserts-per-second to over 96 000 inserts-per-second! Back

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With C arrays, why is it the case that a[5] == 5[a]?

Posted on September 1, 2017October 9, 2017 by TFE Times
Posted in C QuestionsTagged 5a, a5, arrays, case, is, it, that, the, why, with
With C arrays, why is it the case that a[5] == 5[a]?

As Joel points out in Stack Overflow podcast #34, in C Programming Language (aka: K & R), there is mention of this property of arrays in C: a[5] =

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Best C Questions

Posted on September 1, 2017April 2, 2018 by TFE Times
Posted in C Questions, Q/ATagged best, c, questions
Best C Questions

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Why doesn’t GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?

Posted on September 1, 2017October 9, 2017 by TFE Times
Posted in C QuestionsTagged aaaaaa, doesnt, gcc, optimize, to, why
Why doesn’t GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?

I am doing some numerical optimization on a scientific application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it in

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What is “:-!!” in C code?

Posted on September 1, 2017October 9, 2017 by TFE Times
Posted in C QuestionsTagged code, in, is, what
What is “:-!!” in C code?

I bumped into this strange macro code in /usr/include/linux/kernel.h: /* Force a compilation error if condition is true, but also produce a resul

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