C Archives - Page 15 of 22

What is the difference between NULL, ‘\0’ and 0?

In C, there appear to be differences between various values of zero — NULL, NUL and 0. I know that the ASCII character ...

May 11, 2022
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Pointers in C: when to use the ampersand and the asterisk?

I’m just starting out with pointers, and I’m slightly confused. I know & means the address of a variable and that * can ...

May 10, 2022
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How to find the ‘sizeof’ (a pointer pointing to an array)?

First off, here is some code: int main() { int days...

May 10, 2022
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MIN and MAX in C

Where are MIN and MAX defined in C, if at all? What is the best way to implement these, as generically and type ...

May 10, 2022
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Concept behind these four lines of tricky C code

Why does this code give the output C++Sucks? What is the concept behind it? #include <stdio.h> double m...

May 9, 2022
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Printing leading 0’s in C

I’m trying to find a good way to print leading 0, such as 01001 for a ZIP Code. While the number would be ...

May 9, 2022
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Printing all global variables/local variables?

How can I print all global variables/local variables? Is that possible in gdb? 3 Answers 3

May 8, 2022
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Why does the order of the loops affect performance when iterating over a 2D array?

Below are two programs that are almost identical except that I switched the i and j variables around. They both run in different ...

May 8, 2022
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Why does a function with no parameters (compared to the actual function definition) compile?

I’ve just come across someone’s C code that I’m confused as to why it is compiling. There are two points I don’t understand. ...

May 8, 2022
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do { … } while (0) — what is it good for? [duplicate]

This question already has answers here: Why use apparently meaningless do-while and if-else statements in macros? (9 answers) Closed 1 year ago. Possible ...

May 8, 2022
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