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C warning implicit declaration of function 'exit'

Answer 1

+9 A:

Add:

#include <stdlib.h>

to the top of your program.

Greg Hewgill 2010-03-09 06:05:24

@Greg Hewgill: In my program, I have not used `#include <stdlib.h>` and I am getting this warning only when I use `-Wall` option. Otherwise the program compiles fine and executable runs properly. This means that gcc is somehow able to link to the file without my including it. How is that happening?

Lazer 2010-05-06 16:13:06

@eSKay: Implicit declarations are *permitted* in C unless you use the `-Wmissing-protypes` warning switch (which is turned on by `-Wall`).

Greg Hewgill 2010-05-06 19:17:09

Answer 2

+1 A:

Do you have this preprocessor? If not, add it.

#include <stdlib.h>

shinkou 2010-03-09 06:06:39

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C warning implicit declaration of function 'exit'

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