Thread: Getting a Warning When I use exit()

There should be an argument with exit, like this exit(0), exit(1), etc.....

Thats because exit() is defined in stdlib.h and before you added it the compiler didnt know what it was, and after you did add it, like BEN10 says, you didn't pass in the value which it expects.

Here is what the standard has to say about exit.

Originally Posted by C Standard, 1999 Edition, Section 7.20.4.3
Code:
#include <stdlib.h>
void exit(int status);The exit function causes normal program termination to occur. If more than one call to the exit function is executed by a program, the behavior is undefined.

First, all functions registered by the atexit function are called, in the reverse order of their registration, except that a function is called after any previously registered functions that had already been called at the time it was registered. If, during the call to any such function, a call to the longjmp function is made that would terminate the call to the registered function, the behavior is undefined.

Next, all open streams with unwritten buffered data are flushed, all open streams are closed, and all files created by the tmpfile function are removed.

Finally, control is returned to the host environment. If the value of status is zero or EXIT_SUCCESS, an implementation-defined form of the status successful termination is returned. If the value of status is EXIT_FAILURE, an implementation-defined form of the status unsuccessful termination is returned. Otherwise the status returned is implementation-defined.