Section 19.12 Practice: Arrays and Pointers

#include <stdio.h>
void swap (char *x, char *y); 
int main(void) {
  char c = 'P';
  char d = 'T';
  printf("%c%c ", c, d);
  swap(&c, &d);
  printf("%c%c", c, d);
  return 0;
}
void swap (char *x, char *y) {
  char temp;
  temp = *x;
  *x = *y;
  *y = temp;
}