实现一个99乘法表，并且此还有一个扩展功能，就是可以根据自己的喜好输出任何数字的乘法表，如：10*10乘法表，11*11，12*12，-99 realize a multiplication table, and this expansion also has a function that can be output according to their own preferences to any number of multiplication table, such as: 10* 10