返回分割后字符数组的长度，可以通过这个程序结合select函数判断字符数组长度是否在应有范围之内。-Returns the length of the segmented array of characters, you can select functions by combining this procedure to determine whether the proper length array of characters within.

编写程序，要求父进程创建一个子进程，子进程对一个50*50的字符数组赋值，由父进程改变子进程的优先级，观察不同优先级进程使用CPU的时间-Written procedures that require the parent process creates a child process, the child process on a 50* 50 array of characters assigned by the parent process to change the priority o

编写程序，要求父进程创建一个子进程，子进程对一个50*50的字符数组赋值，由父进程改变子进程的优先级，观察不同优先级进程使用CPU的时间-Written procedures that require the parent process creates a child process, the child process on a 50* 50 array of characters assigned by the parent process to change the priority o