C++中关于二维矩阵和三维矩阵的计算

1、二维数据矩阵的乘法：

#include<iostream>
#include<math.h>
#include<string>
using namespace std;
int main()
{
	int m1, n1, m2, n2;
	cout << "请分别输入第一个矩阵的行数m1和列数n1：";
	cin >> m1 >> n1;
	cout << "请分别输入第二个矩阵的行数m2和列数n2：";
	cin >> m2 >> n2;
	float** M1 = new float* [m1];
	float** M2 = new float* [m2];
	float** M3 = new float* [m1];
	for (int i = 0; i < m1; i++)
	{
		M1[i] = new float[n1];
	}
	for (int i = 0; i < m2; i++)
	{
		M2[i] = new float[n2];
	}
	for (int i = 0; i < m1; i++)
	{
		M3[i] = new float[n2];
	}
	for (int i = 0; i < m1; i++)
	{
		for (int j = 0; j < n1; j++)
		{
			M1[i][j] = i + j;
		}
	}
	for (int i = 0; i < m2; i++)
	{
		for (int j = 0; j < n2; j++)
		{
			M2[i][j] = i + j + 1;
		}
	}
	for (int i = 0; i < m1; i&#