头歌实训项目【矩阵运算】_python头歌第6关:矩阵运算

#include <iostream>
#include <string>
using namespace std;
 
class Matrix
{
    friend Matrix operator+(Matrix& m1, Matrix& m2);
    friend Matrix operator-(Matrix& m1, Matrix& m2);
    friend Matrix operator*(Matrix& m1, Matrix& m2);
 
    //矩阵类的声明
private:
    int m_r;
    int m_c;
    int m_Array[10][10];
public:
    Matrix(int r, int c) 
    {
        m_r = r;
        m_c = c;
        Fill(0);
    }
    void Fill(int value);
    void Set(int r, int c, int value);
    int Get(int r, int c);
    void Print();
};
//Matrix::Matrix(int r,int c):m_r(r),m_c(c){}
//全部设值函数
void Matrix::Fill(int value)
{
    
    for (int i = 0; i < m_r; i++)
    {
        for (int j = 0; j < m_c; j++)
        {
            m_Array[i][j] = value;
        }
    }
    return;
}
 
//指定位置设值函数
void Matrix::Set(int r, int c, int value)
{
    m_Array[r][c] = value;
}
 
//获取元素函数
int Matrix::Get(int r, int c)
{
    return m_Array[r][c];
}
 
//打印函数
void Matrix::Print()
{
    for (int i = 0; i < m_r; i++)
    {
        for (int j = 0; j < m_c; j++)
        {
            cout << m_Array[i][j]<<" ";
            if (j == m_c - 1)
            {
                cout << endl;
            }
        }
    }
}
 
//实现矩阵加法
Matrix operator+(Matrix& m1, Matrix& m2)
{
    Matrix temp(m1.m_r, m1.m_c);
 
    for (int i = 0; i < m1.m_r; i++)
    {
        for (int j = 0; j < m1.m_c; j++)
        {
            temp.m_Array[i][j] = m1.m_Array[i][j] + m2.m_Array[i][j];
        }
    }
    return temp;
}
 
//实现矩阵减法
Matrix operator-(Matrix& m1, Matrix& m2)
{
    Matrix temp(m1.m_r, m1.m_c);
 
    for (int i = 0; i < m1.m_r; i++)
    {
        for (int j = 0; j < m1.m_c; j++)
        {
            temp.m_Array[i][j] = m1.m_Array[i][j] - m2.m_Array[i][j];
        }
    }
    return temp;
}
 
//实现矩阵乘法
Matrix operator*(Matrix& m1, Matrix& m2)
{
    Matrix temp(m1.m_r, m2.m_c);
    temp.Fill(0);
    for (int i = 0; i < m1.m_r; i++) 
    {
        for (int j = 0; j < m2.m_c; j++) 
        {
            for (int k = 0; k < m1.m_c; k++) 
            {
                temp.m_Array[i][j] += m1.m_Array[i][k] * m2.m_Array[k][j];
            }
        }
    }
    return temp;
}
 
int main()
{
    int i, j;
    cin >> i >> j;
    Matrix m1(i, j), m2(i, j), m3(j, i);
    m1.Fill(1);
    m2.Fill(2);
    m3.Fill(0);
    for (int s = 0; s < i; s++) {
        for (int c = 0; c < j; c++) {
            if (s == c)
                m3.Set(s, c, s + 1);
        }
    }
    m1.Print();
    m2.Print();
    m3.Print();
    cout << "m1 + m2 :" << endl;
    (m1 + m2).Print();
    cout << "m1 - m2 :" << endl;
    (m1 - m2).Print();
    cout << "m1 * m3 :" << endl;
    (m1 * m3).Print();
 
}