假定矩阵大小为4×5（整型数组表示）； 定义矩阵初始化函数，可以从cin中输入矩阵元素； 定义矩阵输出函数，将矩阵格式化输出到cout； 定义矩阵相加的函数，实现两个矩阵相加的功能,结果保存在另一个矩阵中； 定义矩阵相减的函数，实现两个矩阵

Packet : rectangle.txt filelist

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