C program to perform Scalar matrix multiplication

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C program to perform Scalar matrix multiplication

Write a C program to read elements in a matrix and perform scalar multiplication of matrix. C program for scalar multiplication of matrix. How to perform scalar matrix multiplication in C programming. Logic to perform scalar matrix multiplication in C program.

Required knowledge

Basic C programming, C for loop, ArrayS

Scalar multiplication of matrix

Scalar multiplication of matrix is the simplest and easiest way to multiply matrix. Scalar multiplication of matrix is defined by -

(cA)_ij = c . A_ij (Where 1 ≤ i ≤ m and 1 ≤ j ≤ n)

Program to perform scalar matrix multiplication

 
/**
 * C program to perform scalar matrix multiplication
 */
 
#include <stdio.h>

#define SIZE 3 // Maximum size of the array

int main()
{
    int A[SIZE][SIZE]; 
    int num, row, col;

    /* Input elements in matrix from user */
    printf("Enter elements in matrix of size %dx%d: \n", SIZE, SIZE);
    for(row=0; row<SIZE; row++)
    {
        for(col=0; col<SIZE; col++)
        {
            scanf("%d", &A[row][col]);
        }
    }

    /* Input multiplier from user */
    printf("Enter any number to multiply with matrix A: ");
    scanf("%d", &num);

    /* Perform scalar multiplication of matrix */
    for(row=0; row<SIZE; row++)
    {
        for(col=0; col<SIZE; col++)
        {
            /* (cAij) = c . Aij */
            A[row][col] = num * A[row][col];
        }
    }

    /* Print result of scalar multiplication of matrix */
    printf("\nResultant matrix c.A = \n");
    for(row=0; row<SIZE; row++)
    {
        for(col=0; col<SIZE; col++)
        {
            printf("%d ", A[row][col]);
        }
        printf("\n");
    }

    return 0;
}

Output

Enter elements in matrix of size 3x3:

10 20 30
40 50 60
70 80 90

Enter any number to multiply with matrix A: 3
Resultant matrix c.A =

30  60  90
120 150 180
210 240 270

Process returned 0 (0x0) execution time : 44.041 s

/**
 * C program to perform scalar matrix multiplication
 */

#include <stdio.h>

int main()
{
    int A[10][10];
    int num, row, col,m,n;
    printf("Enter no of rows:");
    scanf("%d",&m);
    printf("Enter no of columns:");
    scanf("%d",&n);

    /* Input elements in matrix from user */
    printf("Enter elements in matrix of size %d %d: \n", m, n);
    for(row=0; row<m; row++)
    {
        for(col=0; col<n; col++)
        {
            scanf("%d", &A[row][col]);
        }
    }

    /* Input multiplier from user */
    printf("Enter any number to multiply with matrix A: ");
    scanf("%d", &num);

    /* Perform scalar multiplication of matrix */
    for(row=0; row<m; row++)
    {
        for(col=0; col<n; col++)
        {
            /* (cAij) = c . Aij */
            A[row][col] = num * A[row][col];
        }
    }

    /* Print result of scalar multiplication of matrix */
    printf("\nResultant matrix c.A = \n");
    for(row=0; row<m; row++)
    {
        for(col=0; col<n; col++)
        {
            printf("%d ", A[row][col]);
        }
        printf("\n");
    }

    return 0;
}

Output:

Enter no of rows:3
Enter no of columns:3
Enter elements in matrix of size 3 3:

5 6 7
1 2 3
8 9 4

Enter any number to multiply with matrix A: 2
Resultant matrix c.A =

10 12 14
2  4  6
16 18 8

Process returned 0 (0x0) execution time : 32.117 s

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