C++ | Multiplication of Matrices using 2d arrays

Introduction

This program is to multiply two matrices. The program below is given. The program is extendable. Look at the extending it section in this post. Go enjoy the program. Lets begin………..

Program to multiply two matrices


#include<iostream.h>
#include<conio.h>
void main()
{
//clear the screen.
clrscr();
//declare variable type int
int a[3][3],b[3][3],i,j,k,s;
//Input the numbers of first matix
cout<<"First Matrix"<<endl;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
cout<<"Enter number :";
cin>>a[i][j];
}
}
//Input the numbers of second matix
cout<<"Second Matrix"<<endl;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
cout<<"Enter number :";
cin>>b[i][j];
}
}
//display the multipication of matrices
cout<<"Multiplication is"<<endl;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
for(k=0;k<3;k++)
s=s+a[i][k]*b[k][j];
cout<<s<<"\t";
s=0;
}
cout<<endl;
}
//get character
getch();
}

Output

First Matrix
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1

Second Matrix
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Enter the number
1
Multiplication is
3 3 3
3 3 3
3 3 3

//The above output looks great in c++. but blog does not show “\t” tabs. Sorry….

How does it work

  1. You enter the number.
  2. The number is saved in respective array for first matrix.
  3. The number is saved in respective array for second matrix.
  4. Then numbers are multiplied and printed to form of matrix.

Extending it

The program can be extended by using more numbers and making the matrix more bigger. Go extend it.

Explanation.

  1. Include ‘iostream.h’ and ‘conio.h’ files.
  2. Add void main.
  3. Start program by first clearing the screen.
  4. Declare the variables as int (name them as you want.)
  5. Add the cout and cin of array.
  6. Add for loop to print the multiplication of matrices.

At the end

You learnt creating the C++ program of Multiplication of matrices using 2d array. So now enjoy the program.

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