题解 | 计算两个矩阵的乘积

#define _CRT_SECURE_NO_WARNINGS

#include <cstdio>
#include <iostream>

using namespace std;

const int maxn = 10;
struct Matrix {
	int row, col;
	int matrix[maxn][maxn];
	Matrix() {};
	Matrix(int r, int c) :row(r), col(c) {}
};

Matrix Add(Matrix x, Matrix y) {
	Matrix answer = Matrix(x.row, x.col);
	for (int i = 0; i < answer.row; i++) {
		for (int j = 0; j < answer.col; j++) {
			answer.matrix[i][j] = x.matrix[i][j] + y.matrix[i][j];
		}
	}
	return answer;
}

Matrix multuply(Matrix x, Matrix y) {
	Matrix answer = Matrix(x.row, y.col);
	for (int i = 0; i < x.row; i++) {
		for (int j = 0; j < y.col; j++) {
			answer.matrix[i][j] = 0;         //注:将答案矩阵全部初始化为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 answer) {
	for (int i = 0; i < answer.row; i++) {
		for (int j = 0; j < answer.col; j++) {
			printf("%d ", answer.matrix[i][j]);
		}
		printf("\n");
	}
}


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 = multuply(x, y);
	printmatrix(answer);
	return 0;
}