return 0；什么意思？
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return 0; 的意思就是退出函数并返回调用函数。
当程序得到一个结果已经无需再往下执行的的时候 或者程序员自己想判断函数执行出错想退出的时候执行 return 0操作; 也可以return 1或其他的值 由程序员自己定义 在调用函数的地方可以取得反回值进行判断 就能知道函数执行的情况。