C Program to multiply two matrix

				
			
					
#include <stdio.h>

int main()
{
    	int r1, c1, r2, c2, i, j, k;

    	printf("Enter rows and column for first matrix: ");
    	scanf("%d %d", &r1, &c1);

    	printf("\nEnter rows and column for second matrix: ");
    	scanf("%d %d",&r2, &c2);

	
   
    	if (c1 != r2)
    	{
        	printf("\ncolumn of first matrix not equal to row of second.\n");
       	}
	else
	{
		int a[r1][c1],b[r2][c2],result[r1][c2];
    
    		printf("\nEnter elements of matrix 1:\n");
    		for(i=0; i<r1; ++i)
        		for(j=0; j<c1; ++j)
        		{
            			scanf("%d", &a[i][j]);
        		}

   
    		printf("\nEnter elements of matrix 2:\n");
    		for(i=0; i<r2; ++i)
        		for(j=0; j<c2; ++j)
        		{
            			scanf("%d",&b[i][j]);
        		}

    
    		for(i=0; i<r1; ++i)
        		for(j=0; j<c2; ++j)
        		{
            			result[i][j] = 0;
        		}
	
	    	for(i=0; i<r1; ++i)
        		for(j=0; j<c2; ++j)
            			for(k=0; k<c1; ++k)
            			{
                			result[i][j]+=a[i][k]*b[k][j];
            			}
    
    		printf("\nOutput Matrix:\n");
    			for(i=0; i<r1; ++i)
        			for(j=0; j<c2; ++j)
        			{
            				printf("%d  ", result[i][j]);
            				if(j == c2-1)
                				printf("\n\n");
        			}
	}

    return 0;
}