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matrix multiplication using pointers in c

Healthy Hare answered on April 17, 2022 Popularity 7/10 Helpfulness 3/10

answer matrix multiplication using pointers in c

matrix multiplication using pointers in c

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/**
 * C program to multiply two matrix using pointers
 */

#include <stdio.h>

#define ROW 3
#define COL 3


/* Function declarations */
void matrixInput(int mat[][COL]);
void matrixPrint(int mat[][COL]);
void matrixMultiply(int mat1[][COL], int mat2[][COL], int res[][COL]);



int main()
{
    int mat1[ROW][COL];
    int mat2[ROW][COL];
    int product[ROW][COL];


    /*
     * Input elements in matrices.
     */
    printf("Enter elements in first matrix of size %dx%d\n", ROW, COL);
    matrixInput(mat1);

    printf("Enter elements in second matrix of size %dx%d\n", ROW, COL);
    matrixInput(mat2);


    // Call function to multiply both matrices
    matrixMultiply(mat1, mat2, product);


    // Print product of both matrix
    printf("Product of both matrices is : \n");
    matrixPrint(product);

    return 0;
}



/**
 * Function to input elements in matrix from user.
 *
 * @mat     Two-dimensional array to store user input.
 */
void matrixInput(int mat[][COL])
{
    int row, col;

    for (row = 0; row < ROW; row++)
    {
        for (col = 0; col < COL; col++)
        {
            scanf("%d", (*(mat + row) + col));
        }
    }
}




/**
 * Function to print elements in a two-dimensional array.
 *
 * @mat     Two-dimensional array to print.
 */
void matrixPrint(int mat[][COL])
{
    int row, col;

    for (row = 0; row < ROW; row++)
    {
        for (col = 0; col < COL; col++)
        {
            printf("%d ", *(*(mat + row) + col));
        }

        printf("\n");
    }
}




/**
 * Function to multiply two matrices.
 *
 * @mat1    First matrix
 * @mat2    Second matrix
 * @res     Resultant matrix to store product of both matrices.
 */
void matrixMultiply(int mat1[][COL], int mat2[][COL], int res[][COL])
{
    int row, col, i;
    int sum;


    for (row = 0; row < ROW; row++)
    {
        for (col = 0; col < COL; col++)
        {
            sum = 0;

            /*
             * Find sum of product of each elements of 
             * rows of first matrix and columns of second 
             * matrix.
             */
            for (i = 0; i < COL; i++)
            {
                sum += (*(*(mat1 + row) + i)) * (*(*(mat2 + i) + col));
            }


            /* 
             * Store sum of product of row of first matrix 
             * and column of second matrix to resultant matrix.
             */
            *(*(res + row) + col) = sum;
        }
    }
}

Popularity 7/10 Helpfulness 3/10 Language whatever

Source: codeforwin.org

Tags: c pointers using whatever

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Contributed on Apr 17 2022

Healthy Hare

0 Answers Avg Quality 2/10

matrix multiplication using pointers in c

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