C++中实现矩阵的加法和乘法实例

C++中实现矩阵的加法和乘法实例

实现效果图:

实例代码:

#include<iostream>

using namespace std;

class Matrix

{

int row;//矩阵的行

int col;//矩阵的列

int **a;//保存二维数组的元素

public:

Matrix();//默认构造函数

Matrix(int r, int c);

Matrix(const Matrix &is);//拷贝构造函数

void Madd(const Matrix &is);//矩阵加

Matrix Mmul(const Matrix &is);//矩阵乘

void display();//显示矩阵元素

};

Matrix::Matrix(int r, int c)

{

row = r;

col = c;

a = (int **)malloc(sizeof(int*)*row);

for (int r = 0; r < row; r++)

{

*(a + r) = (int*)malloc(sizeof(int)*col);

}

printf("请输入数:\n");

for (int i = 0; i < row; i++)

for (int j = 0; j < col; j++)

cin >> a[i][j];

}

Matrix::Matrix(const Matrix & is)

{//拷贝构造函数

row = is.row;

col = is.col;

a = new int*[row];

for (int i = 0; i < row; i++)

{

a[i] = new int[col];

}

a = is.a;

}

void Matrix::Madd(const Matrix & is)

{

if (row != is.row || col != is.col)//判断两矩阵是否符合相加条件

{

cout << "相加的矩阵必须行和列一致";

}

else

{

for (int i = 0; i < row; i++)

{

for (int j = 0; j < col; j++)

{

a[i][j] += is.a[i][j];

}

}

}

}

Matrix Matrix::Mmul(const Matrix & is)

{

Matrix M3(this->row, is.col);

if (this->col != is.row)//判断是否符合相乘条件

{

cout << "不符合两矩阵相乘的条件";

}

else

{

for (int i = 0; i < M3.row; i++)

{

for (int j = 0; j < M3.col; j++)

{

M3.a[i][j] = 0;

for (int n = 0; n < is.row; n++)

{

M3.a[i][j] += this->a[i][n] * is.a[n][j];

}

}

}

}

return M3;

}

void Matrix::display()

{//输出矩阵

for (int i = 0; i < row; i++)

{

for (int j = 0; j < col; j++)

{

cout << a[i][j] << " ";

}

cout << endl;

}

cout << endl;

}

int main()

{

Matrix m1(3, 3);

m1.display();

Matrix m2(3, 3);

m2.display();

Matrix m3(3, 2);

m3.display();

cout << "m1+m2=" << endl;

m1.Madd(m2);

m1.display();

Matrix m4(m1.Mmul(m3));

cout << "m1*m3=" << endl;

m4.display();

system("pause");

return 0;

}

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