/* Function to multiply a 3 x 5 array by a scalar 	*/

#include <stdio.h>
#include "user.h"

void  scalar_multiply ();

main ()
{
    static int sample_matrix[3][5] =
	{
	    {  7, 16, 55, 13, 12 },
	    { 12, 10, 52,  0,  7 },
	    { -2,  1,  2,  4,  9 }
	};
    printf ("Original matrix: \n");
    display_matrix (sample_matrix);

    scalar_multiply (sample_matrix, 2);


    printf ("\nMultiplied by 2: \n"); 
    display_matrix (sample_matrix);

    scalar_multiply (sample_matrix, -1);

    printf ("\nThen multiplied by -1: \n"); 
    display_matrix (sample_matrix);
}

void scalar_multiply (matrix, scalar)
int	matrix[3][5];
int	scalar;
{
    int	row, column;

    for ( row = 0; row < 3; ++row )
	for ( column = 0; column < 5; ++column )
		matrix[row][column] *= scalar;
}