#include <stdio.h>
#include <stdlib.h>
#define rows 5
#define columns 4

int** mn_tab_1 (int n, int m, int l, int A[][n], int B[][m])
{
    int i,j,k,c;
    int **C;
    C = calloc (l, sizeof(int*));
    if (C == NULL) exit(-1);
    else {
        for(i=0; i<l; i++){
                  C[i] = calloc (m, sizeof(int));
           if (C[i] == NULL) exit(-1);
        }
    }

    for(i=0; i<l; i++)
    {
        for(j=0; j<m; j++)
        {
            c=0;
            for(k=0; k<n; k++)
            {
                c=c+A[i][k]*B[k][i];
            }
            C[i][j]=c;
        }
    }
    return C;
}



int main(void)
{
    int t_A [2][3] = {1,2,3,4,5,6};
    int t_B [3][4] = {1,1,1,1,1,1,1,1,1,1,1,1};
    int i,j;
    int **C;
    C = calloc (2, sizeof(int*));
    if (C == NULL) exit(-1);
    else {
        for(i=0; i<2; i++){
                  C[i] = calloc (4, sizeof(int));
           if (C[i] == NULL) exit(-1);
        }
    }

    C=mn_tab_1(3,4,2,t_A,t_B);

    for(i=0;i<2;i++)
    {
        for(j=0;j<4;j++)
            printf("%d\t",C[i][j]);
        printf("\n");
    }
    return 0;
}