EXIT_SUCCESS, EXIT_FAILURE
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EXIT_SUCCESS, EXIT_FAILURE
Defined in header <stdlib.h>
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The EXIT_SUCCESS
and EXIT_FAILURE
macros expand into integral expressions that can be used as arguments to the exit
function (and, therefore, as the values to return from the main function), and indicate program execution status.
Constant | Explanation |
---|---|
EXIT_SUCCESS
|
successful execution of a program |
EXIT_FAILURE
|
unsuccessful execution of a program |
Notes
Both EXIT_SUCCESS
and the value zero indicate successful program execution status (see exit
), although it is not required that EXIT_SUCCESS
equals zero.
Example
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE *fp = fopen("data.txt","r");
if (fp == NULL)
{
fprintf(stderr,"fopen() failed in file %s at line # %d", __FILE__,__LINE__);
exit(EXIT_FAILURE);
}
/* Normal processing continues here. */
fclose(fp);
printf("Normal Return\n");
return EXIT_SUCCESS;
}
Output:
fopen() failed in file main.cpp at line # 9
References
C11 standard (ISO/IEC 9899:2011):
- 7.22/3 General utilities (p: 340)
C99 standard (ISO/IEC 9899:1999):
- 7.20/3 General utilities (p: 306)
C89/C90 standard (ISO/IEC 9899:1990):
- 4.10 General utilities
See also
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Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/c/program/EXIT_status