矩阵相乘(c)

/*
  矩阵相乘
*/
#include  " stdio.h "
#include  " conio.h "

#define  row 2
#define  col 3

main()
{

     int  c[row][row] = { 0 };
     int  a[row][col] = {
                        { 1 , 2 , 3 },
                        { 4 , 5 , 6 }
                    };
     int  b[col][row] = {
                        { 1 , 2 },
                        { 3 , 4 },
                        { 5 , 6 }
                    };
    
     int  i,j,k;

     for (i = 0 ;i < row;i ++ )
    {
        for (j = 0 ;j < row;j ++ )
       {
           c[i][j] = 0 ;

            for (k = 0 ;k < col;k ++ )
           {
               c[i][j] += a[i][k] * b[k][j];
           }

       }
    }

    output(a,row,col);
    output(b,col,row);
    output(c,row,row);
    
    getch();
}


output( int   * arr, int  _row, int  _col)
{
     int  i = 0 ;
     while (i < _row * _col)
    {
         if (i % _col == 0 )printf( " \n " );
        printf( " %d  " , * (arr + i));

        i ++ ;
    }
    printf( " \n==================\n " );
}