C Archives - Page 21 of 22

What is the difference between ++i and i++?

In C, what is the difference between using ++i and i++, and which should be used in the incrementation block of a for ...

April 15, 2022
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Why does the C preprocessor interpret the word “linux” as the constant “1”?

Why does the C preprocessor in GCC interpret the word linux (small letters) as the constant 1? test.c: #include <stdio.h> int main(void) { ...

April 15, 2022
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How to initialize all members of an array to the same value?

I have a large array in C (not C++ if that makes a difference). I want to initialize all members of the same ...

April 15, 2022
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How do I use extern to share variables between source files?

I know that global variables in C sometimes have the extern keyword. What is an extern variable? What is the declaration like? What ...

April 14, 2022
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How do I determine the size of my array in C?

How do I determine the size of my array in C? That is, the number of elements the array can hold? 2 23

April 13, 2022
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What does “static” mean in C?

I’ve seen the word static used in different places in C code; is this like a static function/class in C# (where the implementation ...

April 13, 2022
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How do function pointers in C work?

I had some experience lately with function pointers in C. So going on with the tradition of answering your own questions, I decided ...

April 13, 2022
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With 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 ...

April 11, 2022
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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 result ...

April 11, 2022
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What does the ??!??! operator do in C?

I saw a line of C that looked like this: !ErrorHasOccured() ??!??! HandleError(); It compiled correctly and seems to run ok. It seems ...

April 10, 2022
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