/*
*  
* Demonstrate using a void pointer to pass different types to a function
*/
#include <stdio.h>

void half(void *, char);
void main()
{
	/* Initialize one variable of each type */
	int i = 20;
	long l = 100000;
	float f = 12.456;
	double d = 123.044444;
	/* Display their initial values */
	printf("\n%d", i);
	printf("\n%ld", l);
	printf("\n%f", f);
	printf("\n%lf\n\n", d);

	/* Call half () for each variable. */
	half(&i, 'i');
	half(&l, 'l');
	half(&d, 'd');
	half(&f, 'f');

	/* Display their new values */
	printf("\n%d", i);
	printf("\n%ld", l);
	printf("\n%f", f);
	printf("\n%lf\n", d);
}

void half (void *x, char type)
{
	/* Depending on the value of type, cast the 
	*  pointer x appropriately and divide by 2. */
	switch (type)
	{
	  case 'i':
	  {
		*((int *) x) /= 2;
		break;
	  }
	  case 'l':
	  {
		*((long *) x) /= 2;
		break;
	  }
	  case 'f':
	  {
		*((float *) x) /= 2;
		break;
	  }
	  case 'd':
	  {
		*((double *) x) /= 2;
		break;
	  }
	}
}