#include <stdio.h>
#include <sys/wait.h>
#include <unistd.h>
main() {
    int m, n, k;
    m = fork();
    printf("PID:%d\t", getpid());
    printf("The return value of fork():%d\t\t", m);
    printf("he\n");
    n = fork();
    printf("PID:%d\t", getpid());
    printf("The return value of fork():%d\t\t", n);
    printf("ha\n");
    k = fork();
    printf("PID:%d\t", getpid());
    printf("The return value of fork():%d\t\t", k);
    printf("ho\n");
}