这是一个简单C语言程序代码，有兴趣的朋友可以按照代码演示一下，看看有什么惊奇的变化，看看本来是笑脸的矩阵能不能变成哭脸。(This is a simple C language program code, interested friends can according to the code shown, to see what was surprising changes, see the smiling faces of the matrix can become a sad face.)