C exit() function

C exit() function - Terminate a process

The exit() function is used to return control to the host environment from the program.

Syntax exit() function

void exit(int status)

Parameters exit() function

Return value from exit()

• This function does not return any value.

Example - 1: exit() function

The following example shows the usage of exit() function.

#include <stdio.h>
#include <stdlib.h>
 
FILE *stream;
 
int main(void)
{
  printf("Exit when i = 7");
  for(int i =0; i<=10; i++)
  {
  	printf("\ni = %d",i);
       if (i ==7)
	   exit(1);
   }
}

Output:

Exit when i = 7
i = 0
i = 1
i = 2
i = 3
i = 4
i = 5
i = 6
i = 7

Example - 2: exit() function

In this example, the program ends after deleting buffers and closing any open files if it is unable to open the file 'test.txt'.

#include <stdio.h>
#include <stdlib.h>
 
FILE *stream;
 
int main(void)
{
   if ((stream = fopen("user/test.txt", "r")) == NULL)
   {
      perror("Could not open data file! ");
      exit(EXIT_FAILURE);
   }
}

Output:

Could not open data file! : No such file or directory

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