#include <stdio.h>
//void swap(int a, int b); Call By Value
void swap(int *a, int *b); //Call By reference

int main()
{
  int num1=10;
  int num2=20;

  swap(&num1,&num2); //Call By Value

  //swap(&num1,&num2); //Call By reference
  //printf("Call By Value 스왑을 한 결과 : num1=%d, num2=%d\n",num1,num2);
  printf("Call By reference 스왑을 한 결과 : num1=%d, num2=%d\n",num1,num2);

}
/*
//Call by Value 스왑 함수!
void swap(int a, int b)
{
  int temp;
  temp = a;
  a = b;
  b = temp;
}
*/

//Call by Refernce 스왑 함수!!
void swap(int *a, int *b)
{
   int temp;
   temp = *a;
   *a = *b;
   *b = temp;
}