定义二维数组存储m名学生n门功课的成绩，m和n键盘输入

* 并计算每个同学的平均成绩。

* 要求捕获以下几种异常：

类型不匹配异常，如输入的是字符串等

输入的数值范围不合理，如>100,或<0

求平均成绩时，要考虑被0除的异常。

-Defined two-dimensional array stored m n subjects of student achievement, m and n keyboard input* and calculate each student' s grade point average.* Requires the capture of the following exception: Type mismatch exception, such as the input string value input range is unreasonable, such as>　100 or < 0 find the average score, we should consider by-zero exception.