石头、剪子、布：人和计算机各出其中一个，然后给出比较结果，接着重新进行比较，直到用户输入退出才结束。用多个函数实现。-Stone, scissors, cloth: and the computer from each one of them, and then gives results of the comparison, and then compare again until the user enters quit before the end. Achieved with multi