#include<stdio.h>
/*
 * Example program that demonstrates that only the
 * values are passed to parameters and the original
 * variable does not change.
 * 06.20.05
 * Sara Sprenkle
 */

/*
 * Swap the values in x and y (does not affect
 * values in calling function)
 */
void swap( int x, int y ) {
  int temp = x;
  x = y;
  y = temp;
  printf("x is %d\n", x );
  printf("y is %d\n", y );
  /* return is not required */
}

int main() {

  int x, y;

  printf("Enter two numbers: ");
  scanf("%d %d", &x, &y);
  
  printf("Before swap:\n");
  printf("x is %d\n", x );
  printf("y is %d\n", y );

  swap( x, y );

  printf("After swap:\n");
  printf("x is %d\n", x );
  printf("y is %d\n", y );

}