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C Program to Compute the Product of Two Matrices



C Program to Compute the Product of Two Matrices

This C Program computes the product of two matrices. This program accepts the 2 matrices and then find the product of 2 matrices.

    /*
     * Develop functions to read a matrix, display a matrix and compute
     * product of two matrices.
     * Use these functions to read two MxN matrices and compute their
     * product & display the result
     */

    #include <stdio.h>

    #define maxrows 10

    #define maxcols 10

    void readMatrix(int arr[][maxcols], int m, int n);

    void printMatrix(int arr[][maxcols], int m, int n);

    void productMatrix(int array1[][maxcols], int array2[][maxcols],

    int array3[][maxcols], int m, int n);

    void main()

    {

        int array1[maxrows][maxcols], array2[maxrows][maxcols],

        array3[maxrows][maxcols];

        int m, n;

        printf("Enter the value of m and n \n");

        scanf("%d %d", &m, &n);

        printf("Enter Matrix array1 \n");

        readMatrix(array1, m, n);

        printf("Matrix array1 \n");

        printMatrix(array1, m, n);

        printf("Enter Matrix array2 \n");

        readMatrix(array2, m, n);

        printf("Matrix B \n");

        printMatrix(array2, m, n);

        productMatrix(array1, array2, array3, m, n);

        printf("The product matrix is \n");

        printMatrix(array3, m, n);

    }

    /*  Input Matrix array1 */

    void readMatrix(int arr[][maxcols], int m, int n)

    {

        int x, j;

        for (x = 0; x < m; x++)

        {

            for (j = 0; j < n; j++)

            {

                scanf("%d", &arr[x][j]);

            }

        }

    }

    void printMatrix(int arr[][maxcols], int m, int n)

    {

        int x, j;

        for (x = 0; x < m; x++)

        {

            for (j = 0; j < n; j++)

            {

                printf("%3d", arr[x][j]);

            }

            printf("\n");

        }

    }

    /*  Multiplication of matrices */

    void productMatrix(int array1[][maxcols], int array2[][maxcols],

    int array3[][maxcols], int m, int n)

    {

        int x, j, k;

        for (x = 0; x < m; x++)

        {

            for (j = 0; j < n; j++)

            {

                array3[x][j] = 0;

                for (k = 0; k < n; k++)

                {

                    array3[x][j] = array3[x][j] + array1[x][k] *

                    array2[k][j];

                }

            }

        }

    }