设计算法判断字符串是否中心对称，要求利用栈作为存储结构？-Design algorithm to judge whether the center of the string symmetry, require the use of the stack as the storage structure?

1.使用for循环将9x9乘法表输出到c盘的test1.txt中，要求采用格式化输出。- Use for loop 9x9 multiplication table output to c drive test1.txt, requiring the use of formatted output.