Matrix Multiplication

[the_contractor]

#include <stdio.h>
#define M 2
#define N 3
#define K 3

// A[M][N]*B[N][K] = C[M][K]
void main()
{
	int A[M][N]={{1,2,3},{4,5,6}} , B[N][K]={{1,1,1,},{2,2,2,},{1,1,1}} , C[M][K]={0};
	int i, j ;

	for(i=0; i<M; i++)
		for(j=0; j<K; j++)
			for(j=C[i][j]=0; j<N; j++)
				C[i][j] += A[i][j]*B[i][j];

	for(i=0; i<M; i++)
	{
		for(j=0; j<K; j++)
			printf("%3d",C[i][j]);
		printf("\n");
	}
}

why the answer not correct ?

[grumpy]

The two inner loops of your multiplication are using the same controlling variable (j). There is probably another variable (named k to continue with your naming convention) needed to control the innermost loop.

Oh, and main() returns int, not void. Anyone or any documentation that told you main() returns void is deficient.

[rakeshkool27]

TRy out like this for multiplying the matrices

 printf("\n\nTHE EQUIVALENT MULTIPLICATION MATRIX IS:\n\n");
 for(i=0;i<M;i++)
    {
     for(j=0;j<K;j++)
	{
	 sum=0;
	 for(n=0;n<N;n++)
	    {
	     sum = sum + (mat1[i][n] * mat2[n][j]);
	    C[i][j] = sum;
	    }

	 printf("%-5d ",C[i][j]);
	 if(j==c2-1)
	  {
	   printf("\n");
	  }
	}
    }

This will work out.......