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# Program to multiply two matrices

Posted By: Easy Tutor     Category: C++ Programming     Views: 27474

## Code for Program to multiply two matrices in C++ Programming

``` # include <iostream.h>
# include   <stdlib.h>
# include    <conio.h>

/***********************************************************************///-----------------------------  Matrix  ------------------------------///***********************************************************************/class Matrix
{
private:
float matrix_a[3][3];
float matrix_b[3][3];
float matrix_c[3][3];

public:
Matrix( );

void get_matrix_a( );
void get_matrix_b( );
void multiply_matrices( );
void show_result_Matrix( );
};

/***********************************************************************///----------------------------  Matrix( )  ----------------------------///***********************************************************************/

Matrix::Matrix( )
{
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
matrix_a[i][j]=0;
matrix_b[i][j]=0;
matrix_c[i][j]=0;
}
}

gotoxy(1,1);
cout<<" ******************************************************************************"<<endl;
cout<<" * * * * * * * * * * * * * *  Matrix  Multiplication  * * * * * * * * * * * * *"<<endl;
cout<<" ******************************************************************************"<<endl;

gotoxy(1,25);
cout<<" ******************************************************************************";
}

/***********************************************************************///-------------------------  get_matrix_a( )  -------------------------///***********************************************************************/void Matrix::get_matrix_a( )
{
gotoxy(1,6);
cout<<" Enter the values of the Matrix A row by row :\n "<<endl;

cout<<"\t\t\t Ú               ¿"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t À               Ù"<<endl;

gotoxy(18,10);
cout<<" A  = "<<endl;

int x=28;
int y=9;

for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
gotoxy(x,y);
cin>>matrix_a[i][j];

x+=5;
}

x=28;
y++;
}
}

/***********************************************************************///-------------------------  get_matrix_b( )  -------------------------///***********************************************************************/void Matrix::get_matrix_b( )
{
gotoxy(1,15);
cout<<" Enter the values of the Matrix B row by row :\n "<<endl;

cout<<"\t\t\t Ú               ¿"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t À               Ù"<<endl;

gotoxy(18,19);
cout<<" B  = "<<endl;

int x=28;
int y=18;

for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
gotoxy(x,y);
cin>>matrix_b[i][j];

x+=5;
}

x=28;
y++;
}
}

/***********************************************************************///----------------------  multiply_matrices( )  -----------------------///***********************************************************************/void Matrix::multiply_matrices( )
{
for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
floatvalue=0;
float sum=0;

for(int k=0;k<3;k++)
{
value=matrix_a[j][k]*matrix_b[k][j];
sum+=value;
}

matrix_c[i][j]=sum;
}
}
}

/***********************************************************************///---------------------  show_result_Matrix( )  -----------------------///***********************************************************************/void Matrix::show_result_Matrix( )
{
clrscr( );

gotoxy(1,1);
cout<<" ******************************************************************************"<<endl;
cout<<" * * * * * * * * * * * * * *  Matrix  Multiplication  * * * * * * * * * * * * *"<<endl;
cout<<" ******************************************************************************"<<endl;

gotoxy(1,6);
cout<<" The values of Matrix A and B are :"<<endl;

cout<<"\t\t Ú               ¿                  Ú               ¿"<<endl;
cout<<"\t\t ³               ³                   ³               ³"<<endl;
cout<<"\t\t ³               ³                   ³               ³"<<endl;
cout<<"\t\t ³               ³                  ³               ³"<<endl;
cout<<"\t\t À               Ù             À               Ù"<<endl;

gotoxy(45,9);
cout<<" B  = "<<endl;

gotoxy(10,9);
cout<<" A  = "<<endl;

gotoxy(1,15);
cout<<" The Product of Matrix A and B is :\n "<<endl;

cout<<"\t\t\t Ú               ¿"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t ³               ³"<<endl;
cout<<"\t\t\t À               Ù"<<endl;

gotoxy(13,19);
cout<<" A * B  = "<<endl;

int x_1=20;
int y_1=8;

int x_2=55;
int y_2=8;

int x_3=28;
int y_3=18;

for(int i=0;i<3;i++)
{
for(int j=0;j<3;j++)
{
gotoxy(x_1,y_1);
cout<<matrix_a[i][j];

gotoxy(x_2,y_2);
cout<<matrix_b[i][j];

gotoxy(x_3,y_3);
cout<<matrix_c[i][j];

x_1+=5;
x_2+=5;
x_3+=5;
}

x_1=20;
y_1++;

x_2=55;
y_2++;

x_3=28;
y_3++;
}

gotoxy(1,25);
cout<<" ******************************************************************************";
}

int main( )
{
textmode(BW80);
clrscr( );

Matrix Obj;

Obj.get_matrix_a( );
Obj.get_matrix_b( );
Obj.multiply_matrices( );
Obj.show_result_Matrix( );

getch( );
return 0;
}
```
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