swap.cpp

#include<iostream>
void swap(int x, int y);
void swap2(int* x, int* y); //call by reference

int main()
{
    int i = 2;
    int j = 4;
    swap(i, j);
    std::cout << "i = " << i << " , j = " << j << std::endl;
    swap2(&i, &j);
    std::cout << "i = " << i << " , j = " << j << std::endl;

    return 0;
}


void swap(int x, int y) //call by value
{
    int temp = x;
    x = y;
    y = temp;
}

void swap2(int* x, int* y) //call by reference
{
    int temp = *x; //dereferencing x->value
    *x = *y;
    *y = temp;
}