有两个矩阵a和b，均为2 行3列。求两个矩阵之和。重载运算符“+” ，使之能用 于矩阵相加。如c=a+b。初值自拟。#includeclass juzhenprivate:int a23;public:friend juzhen operator +(juzhen &a, juzhen &b);juzhen()for (int i = 0; i aij;void output()for (int i = 0; i 2; i+)for (int j = 0; j 3; j+)std:cout aij ;std:cout std:endl;juzhen operator +(juzhen &a, juzhen &b)juzhen c;for (int i = 0; i 2; i+)for (int j = 0; j 3; j+)c.aij = a.aij + b.aij;return c;void main()juzhen A;juzhen B;A.input();B.input();juzhen C;C = A + B;C.output();system(pause);