Demonstrate the pointer version of swap(): Exchange the values of the variables pointed to by x and y : function parameters « Function « C++ Tutorial

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2. Function
3. function parameters

#include <iostream> 
using namespace std; 
 
void swap(int *x, int *y); 
 
int main() 
{ 
  int i, j; 
 
  i = 10; 
  j = 20; 
 
  cout << "Initial values of i and j: "; 
  cout << i << ' ' << j << '\n'; 
 
  swap(&j, &i); // call swap() with addresses of i and j 
 
  cout << "Swapped values of i and j: "; 
  cout << i << ' ' << j << '\n'; 
 
  return 0; 
} 
 
void swap(int *x, int *y) 
{ 
  int temp; 
 
  temp = *x;
  *x = *y;  
  *y = temp;
}

Initial values of i and j: 10 20
Swapped values of i and j: 20 10