//fork()
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
    pid_t child_pid;

    child_pid=fork();
    switch(child_pid)
    {
        case -1:
            printf("Create process failed!\n");
            break;
        case 0:
            printf("Child process with ID : %d .\n",(int)getpid());
            break;
        default:
            printf("Parent process with ID : %d ,Child process ID : %d .\n",(int)getpid(),(int)child_pid);
            break;
    }
    return 0;
}