c++使用二重指针实现矩阵的储存释放和乘法

#include<iostream>
using namespace std;
//新建一个矩阵
double **allocMatrix(int n) {
double **matrix;
matrix = new double *[n];
for (int i = 0; i < n; i++) {
matrix[i] = new double[n];
}
for (int i = 0; i<n; i++)
for (int j = 0; j<n; j++)
{
cin >> matrix[i][j];
}
return matrix;
}
//释放一个矩阵
void releaseMatrix(double **m, int n) {
for (int i = 0; i<n; i++)
delete[] m[i];
delete[] m;
}
//输出一个矩阵
void printMatrix(double **m, int n) {
for (int x = 0; x < n; x++) {
for (int y = 0; y < n; y++)
{
cout << m[x][y]<<" ";
}
cout << endl;
}
}
//实现两个矩阵的乘法
double **multiple(double **m1, double**m2, int n) {
double **mul;
mul = new double *[n];
for (int i = 0; i < n; i++) {
mul[i] = new double[n];
}
for (int x = 0; x<n; x++)
for (int y = 0; y<n; y++)
{
mul[x][y]=0;
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
for (int k = 0; k < n; k++) {
mul[i][j] = mul[i][j]+m1[i][k]*m2[k][j];
}
}
}
return mul;
}
int main() {
cout << "请输入矩阵的阶数" << endl;
int n;
cin >> n;
cout << "请输入第一个矩阵的参数" << endl;
double **m1 = allocMatrix(n);
cout << "请输入第二个矩阵的参数" << endl;
double **m2 = allocMatrix(n);
cout << "第一个矩阵为" << endl;
printMatrix(m1, n);
cout << "第二个矩阵为" << endl;
printMatrix(m2, n);
double **mul =multiple(m1, m2, n);
printMatrix(mul, n);
releaseMatrix(m1, n);
releaseMatrix(m2, n);
system("pause");
return 0;
}

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