Write a C Program That Uses Functions to Perform Multiplication Of Two Matrices

In this article, we will write a C program that uses functions to perform the Multiplication of two matrices.

ALGORITHM: 

Step 1: Start 

Step2: for i is 0 to 2 by step 1 for j is 0 to 2 by step 1 

Step 3: Read a[i][j],b[i][j] 

Step 4: goto step 2 

Step 5: calculate c[i][j]=c[i][j]+a[i][k]*b[k][j] 

Step 6: goto step 2 

Step 7: Print c[i][j] 

Step 8: Stop 

Write a C Program That Uses Functions to Perform Multiplication Of Two Matrices

#include <stdio.h >
#include <conio.h>

int i, j, k;
void main()
{
	int a[10][10], b[10][10], c[10][10], m, n, p, q;
	void mul(int x[10][10], int y[10][10], int z[10][10], int m, int n, int p, int q);
	void read(int x[10][10], int m, int n);
	void display(int x[10][10], int m, int n);
	clrscr();
	printf("Enter the size of A Mtrix (Row and Col): \n");
	scanf("%d%d", &m, &n);
	printf("Enter the size of B Mtrix (Row and Col): \n");
	scanf("%d%d", &p, &q);
	if (n != p)
	{
		printf("Multiplication Not Possible\n Please re-enter\n");
		printf("correct size and try again .....\n");
	}
	else
	{
		read(a, m, n);
		read(b, m, n);
		mul(a, b, c, m, n, p, q);
		printf("A Matrix is :\n");
		display(a, m, n);
		printf("B Matrix is :\n");

		display(b, m, n);
		printf("C Matrix is :\n");
		display(c, m, n);
	}
	getch();
}
void mul(int x[10][10], int y[10][10], int z[10][10], int m, int n, int p, int q)
{
	for (i = 0; i < m; i++)
		for (j = 0; j < q; j++)
		{
			z[i][j] = 0;
			for (k = 0; k < n; k++)
				z[i][j] += x[i][k] *y[k][j];
		}
}

void read(int x[10][10], int m, int n)
{
	printf("Enter Matrix Value Row by Row\n");
	for (i = 0; i < m; i++)
		for (j = 0; j < n; j++)
			scanf("%d", &x[i][j]);

}

void display(int x[10][10], int m, int n)
{
	for (i = 0; i < m; i++)
	{
		for (j = 0; j < n; j++)
			printf("%5d", x[i][j]);
		printf("\n");
	}
	printf("\n");

}

Input:

Enter the size of A Mtrix (Row and Col): 2 2
Enter the size of B Mtrix (Row and Col): 2 2
Enter Matrix Value Row by Row
1 0
2 6
Enter Matrix Value Row by Row
3 4
4 2
Output:
A matrix is:
1 0
2 6
B Matrix is:
3 4
4 2
C matrix is:
3 4
24 20

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