/* Using type void pointers. */

#include <stdio.h>

void half(void *x, char type);

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", d);
     return(0);
}

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;
             }
     }
}