题解 | #计算两个矩阵的乘积#

#include<iostream>
#include<cstdio>


using namespace std;

struct Matrix{
    int matrix[3][3];
    int row,col;        //行与列
    Matrix(int r,int c):row(r),col(c){}   //构造函数
};

Matrix Multiply(Matrix x,Matrix y)  //矩阵乘法
{
    Matrix answer(x.row,y.col);
    for(int i=0;i<answer.row;++i){
        for(int j=0;j<answer.col;++j){
            answer.matrix[i][j]=0;
            for (int k=0;k<x.col;++k){
                answer.matrix[i][j]+=x.matrix[i][k]*y.matrix[k][j];
            }
        }
    }
    return answer;
}

void PrintMatrix(Matrix x){           //输出矩阵
    for(int i=0;i<x.row;++i){
        for(int j=0;j<x.col;++j){
            printf("%d ", x.matrix[i][j]);
        }
        printf("\n");
    }
    return;
}

int main()
{
    Matrix x(2,3);
    Matrix y(3,2);
    for(int i=0;i<x.row;++i){
        for(int j=0;j<x.col;++j){
            scanf("%d", &x.matrix[i][j]);
        }
    }
    for(int i=0;i<y.row;++i){
        for(int j=0;j<y.col;++j){
            scanf("%d", &y.matrix[i][j]);
        }
    }
    Matrix answer = Multiply(x,y);
    PrintMatrix(answer);
    return 0;

}