/*
 * @Author: 123123
 * @Date: 2020-07-18 18:30:18
 * @LastEditors: your name
 * @LastEditTime: 2020-07-18 18:35:12
 * @Description: file content
 * @new: 
 */ 

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
/**
 * @description: 
 * @param {type} 
 * @return: 
 */ 
main()
{
    pid_t pid;
    char *msg;
    int k;
 
    pid=fork();
    switch(pid){
        //子进程执行部分
		case 0:
            msg="Child process is running.\n";
            k=3;
            break;
        case -1:
            perror("Process creation failed.\n");
            break;
        //父进程执行部分
		default:
            msg="Parent process is running.\n";
            k=5;
            break;
    }
 
	//父子进程共同执行部分
    while(k>0){
        puts(msg);
        sleep(1);
        k--;
    }
}