测验一

#include <iostream>
#include <iomanip>
using namespace std;
class matrix {
private:
int row, column;
int** mat;
public:
matrix(const matrix& mx) {
this->row = mx.row;
this->column = mx.column;
this->mat = new int* [row];
for (int i = 0; i < row; ++i) {
this->mat[i] = new int[column];
for (int j = 0; j < column; ++j) {
this->mat[i][j] = mx.mat[i][j];
}
}
}
matrix(int r, int c) {
row = r;
column = c;
mat = new int* [row];
for (int i = 0; i < row; ++i) {
mat[i] = new int[column];
for (int j = 0; j < column; ++j) {
mat[i][j] = 0;
}
}
}
~matrix() {
for (int i = 0; i < row; ++i) {
delete[]mat[i];
}
delete[]mat;
}
void read() {
for (int j = 0; j < row; ++j) {
for (int i = 0; i < column; ++i) {
cin >> mat[j][i];
}
}
}
matrix operator*(matrix& mt) {
if (this->row == 1 && this->column == 1) {
for (int i = 0; i < mt.row; ++i) {
for (int j = 0; j < mt.column; ++j) {
mt.mat[i][j] = this->mat[0][0] * mt.mat[i][j];
}
}
return mt;
}
else {
matrix rs(this->row, mt.column);
for (int i = 0; i < this->row; ++i) {
for (int j = 0; j < mt.column; ++j) {
for (int k = 0; k < mt.row; ++k) {
rs.mat[i][j] += this->mat[i][k] * mt.mat[k][j];
}
}
}
return rs;
}
}
void display() {
for (int i = 0; i < row; ++i) {
for (int j = 0; j < column; ++j) {
cout << setw(10) << mat[i][j];
}
cout << endl;
}
}
};
int main()
{
int r, c;
cin >> r >> c;
matrix m1(r,c);
m1.read();
int r1,c1;
cin>>r1>>c1;
matrix m2(r1,c1);
m2.read();
if(c==r1||r==1&&c==1){
matrix m3=m1*m2;
m3.display();
}
else{
cout<<"Invalid Matrix multiplication!";
}
return 0;
}