In this program

#include<stdio.h>
#include<signal.h>
#include<stdlib.h>

int main()
{
    pid_t child;
    child=fork();
    switch(child){
        case -1 :
            perror("fork");
            exit(1);
        case 0 :
            while(1){
                printf("Child Process\n");
                sleep(1);
            }
            break;              
        default :
            sleep(5);
            kill(child,SIGINT);
            printf("The child process has been killed by the parent process\n");
            break;
    }
    return 0;
}