6.19.16 exit Function

Terminates program after clean up.

Include

<stdlib.h>

Prototype

void exit(int status);

Argument

status

the exit status to return

Remarks

The exit function calls any functions registered by atexit in reverse order of registration, flushes buffers, closes streams, closes any temporary files created with tmpfile and then calls _Exit.

Example

See the notes at the beginning of this chapter or section for information on using printf() or scanf() (and other functions reading and writing the stdin or stdout streams) in the example code.

#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include <errno.h>

int main()
{
    double result, x=-9.0;

    result = log(x);
    if(errno) {
        printf("terminating execution\n");
        exit(EXIT_FAILURE);
    } else
	    printf("Log of %g is %g\n", x, result);
}

Example Output

terminating execution