#include <stdio.h>
#include <math.h>
#include <stdlib.h>

void split (double number, char* sign, int *whole, double *fraction)
{
  /* This function has pointers as parameters. The function cannot change
	values of variables provided by "main" as arguments. But it can change
	variables at addresses pointed to by "sign", "whole" and "fraction"  
  */
	if (number < 0)
		*sign = '-';
	else 
	if (number > 0)
		*sign = '+';
	else 
		*sign = ' ';    

*whole = abs ((int)number);
*fraction = fabs (number) - *whole;
}

int main (void)
{
	double n, f; int w; char s;

	printf ("Enter a double number to split:");
	scanf ("%lf", &n);

       /* See that when a parameter is a pointer, you must send 
          an address of a variable to it. Because "split" function gets
	  addresses of variables, it can modify variables themselves. */

	split (n, &s, &w, &f);

printf ("The sign is: %c\n", s);
printf ("The whole part is: %d\n", w);
printf ("The fraction is: %lf\n", f);

return (0);
}