/* this is a quick rewrite of the multiplication table program
   so that it uses a function */
   
#include <stdio.h>
#include <math.h>

#define LOWER 0   /* the lower and upper limit for the multiplication table */
#define UPPER 12

int multiply( int x, int y );

int main()
{
	int i, j, k, l;
	i = j = k = l = 0;
	
	for ( i = LOWER; i <= UPPER; ++i)
		printf("\t%d", i);
		
	printf("\n");
	
	for ( i = LOWER; i <= UPPER; ++i)
	{
		printf("\t");
		k = (log10(i)) + 1; /* k = number of digits, i */
		for ( l = 0; l < k; ++l )
			printf("-");
	}
	
	printf("\n");
	
	for ( i = LOWER; i <= UPPER; ++i)
	{
		printf("%2d |", i);
		for ( j = LOWER; j <= UPPER; ++j)
		{
			printf("\t%d", multiply(i,j));
		} 
		printf("\n");
	}
	
	return 0;
}

int multiply( int x, int y)
{
	return x*y;
}