C++ Program to Multiply Two Matrices using array

By | 27.12.2016

Multiply Two Matrices using array 

Write a C++ Program to Multiply Two Matrices using array. Here’s simple Program to Multiply Two Matrices using array in C++ Programming Language.

What is Matrix ?

Matrix representation is a method used by a computer language to store matrices of more than one dimension in memory. C uses “Row Major”, which stores all the elements for a given row contiguously in memory.

Two-dimensional Arrays : :

The simplest form of multidimensional array is the two-dimensional array. A two-dimensional array is, in essence, a list of one-dimensional arrays. An m × n (read as m by n) order matrix is a set of numbers arranged in m rows and n columns.

To declare a two-dimensional integer array of size [x][y], you would write something as follows −

  • type arrayName [ x ][ y ];

Where type can be any valid C data type and arrayName will be a valid C identifier.

To multiply two matrices in C++ programming, you have to ask to the user to enter the first and second matrix elements.Now start multiplying the two matrices and store the multiplication result inside any variable say sumand finally store the value of sum in the third matrix say mat3[ ][ ]

Below is the source code for C++ Program to Multiply Two Matrices using array which is successfully compiled and run on Windows System to produce desired output as shown below :


/*  C++ Program to Multiply Two Matrices using array  */

using namespace std;

int main()

        int arr1[5][5], arr2[5][5], arr3[5][5], sum=0, i, j, k,m,n;

        cout<<"Enter size of matrix ( Max:5 ) :: ";
    cout<<"\nEnter Elements to Matrix A Below :: \n";

            cout<<"\nEnter arr1["<<i<<"]["<<j<<"] Element :: ";


    cout<<"\nEnter Elements to Matrix B Below :: \n";

            cout<<"\nEnter arr2["<<i<<"]["<<j<<"] Element :: ";


        cout<<"\nMultiplying two matrices.....\n";
        for(i=0; i<3; i++)
                for(j=0; j<3; j++)
                        for(k=0; k<3; k++)
                                sum = sum + arr1[i][k] * arr2[k][j];
                        arr3[i][j] = sum;
        cout<<"\nMultiplication of two Matrices : \n\n";
        for (i = 0; i < m; ++i)
            for (j = 0; j < m; ++j)

        return 0;


/*  C++ Program to Multiply Two Matrices using array  */

Enter size of matrix ( Max:5 ) :: 3

Enter Elements to Matrix A Below ::

Enter arr1[0][0] Element :: 1

Enter arr1[0][1] Element :: 2

Enter arr1[0][2] Element :: 3

Enter arr1[1][0] Element :: 4

Enter arr1[1][1] Element :: 5

Enter arr1[1][2] Element :: 6

Enter arr1[2][0] Element :: 7

Enter arr1[2][1] Element :: 8

Enter arr1[2][2] Element :: 9

Enter Elements to Matrix B Below ::

Enter arr2[0][0] Element :: 1

Enter arr2[0][1] Element :: 2

Enter arr2[0][2] Element :: 3

Enter arr2[1][0] Element :: 4

Enter arr2[1][1] Element :: 5

Enter arr2[1][2] Element :: 6

Enter arr2[2][0] Element :: 7

Enter arr2[2][1] Element :: 8

Enter arr2[2][2] Element :: 9

Multiplying two matrices.....

Multiplication of two Matrices :

        30      36      42

        66      81      96

        102     126     150

Process returned 0

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Thanks for reading the post….

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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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arin elyasi

why did you insert k equal to 3?
maybe i want select matrix [5][5] as example for test the code.
i cant figure out why input the value of k equal to 3.please explain if it possible.