WAP Compute the Product of Two Matrices


Levels of difficulty: / perform operation:

This C Program computes the product of two matrices. This program accepts the 2 matrices and then find the product of 2 matrices.
Here is source code of the C program to compute the product of two matrices. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

Program

/*
 * 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 i, j;
	for (i = 0; i < m; i++) {
		for (j = 0; j < n; j++) {
			scanf("%d", &arr[i][j]);
		}
	}
}
void printMatrix(int arr[][MAXCOLS], int m, int n) {
	int i, j;
	for (i = 0; i < m; i++) {
		for (j = 0; j < n; j++) {
			printf("%3d", arr[i][j]);
		}
		printf("\n");
	}
}
/*  Multiplication of matrices */
void productMatrix(int array1[][MAXCOLS], int array2[][MAXCOLS],
int array3[][MAXCOLS], int m, int n) {
	int i, j, k;
	for (i = 0; i < m; i++) {
		for (j = 0; j < n; j++) {
			array3[i][j] = 0;
			for (k = 0; k < n; k++) {
				array3[i][j] = array3[i][j] + array1[i][k] *
				                array2[k][j];
			}
		}
	}
}

Output

Enter the value of m and n
3 3
Enter matrix array1
4 5 6
1 2 3
3 7 8
Matrix array1
  4  5  6
  1  2  3
  3  7  8
Enter matrix array2
5 6 9
8 5 3
2 9 1
Matrix array2
  5  6  9
  8  5  3
  2  9  1
The product matrix is
 72103 57
 27 43 18
 87125 56





Quantitative Aptitude
Reasoning
Programming
Interview