编写程序，通过fork生成父子进程，子进程运行中显示当前系统的记录时钟，父进程运行时完成将数字1~100循环显示到标准输出流上。多次运行该程序，观察输出内容的变化。然后修改程序使得：

（1）始终为子进程先输出。

（2）始终为父进程先输出。

-Programming, parent and child processes generated via fork, the child process running clock displays the current system of records, the parent process runs complete cycle will be the number 1 to 100 to the standard output stream. Repeatedly run the program and observe the output changes. Then modify the program such that: (a) the child process is always the first output. (2) is always the first output of the parent process.