Header File 

stdlib.h 

Category 

Process Control Routines 

Prototype 

void exit(int status); 

Description 

Terminates program. 

exit terminates the calling process. Before termination, all files are closed, buffered output (waiting to be output) is written, and any registered "exit functions" (posted with atexit) are called. 

status is provided for the calling process as the exit status of the process. Typically a value of 0 is used to indicate a normal exit, and a nonzero value indicates some error. It can be, but is not required, to be set with one of the following:

Return Value 

None. 

Example  

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
   int status;
   printf("Enter either 1 or 2\n");
   status = getchar();
   exit(status - '0'); 
/* Note: this line is never reached */
   return 0;
}

Portability