设计一个支持矩阵加减乘运算的程序。设计一个具有三个主要功能模块（矩阵相加、矩阵相减、矩阵相乘）的矩阵运算系统。同时，为了配合矩阵运算的需要，该矩阵运算系统必须包含输入和输出矩阵的功能。-Modified design of a support matrix multiplication process. Design has three main functions of a module (matrix add, matrix subtraction, matrix multiplication) of the matrix computing systems. Meanwhile, in order to meet the needs of matrix operations, the matrix computing system must include input and output matrix function.