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#include <iostream>
// C++ can pass arguments are references
// by value
int square(int x)
{
return x * x;
}
// swap by value (passing pointers)
void swap(int *x, int *y)
{
int temp = *x;
*x = *y;
*y = temp;
}
// Swap by reference - function overload
void swap(int& x, int& y)
{
int temp = x;
x = y;
y = temp;
}
int main(void) {
int a = 9, b;
b = square(a);
std::cout << "Square of a: " << b << std::endl;
std::cout << "A: " << a << " B: " << b << std::endl;
swap(&a, &b);
std::cout << "Swapping by addr value:" << std::endl;
std::cout << "New A: " << a << " New B: " << b << std::endl;
swap(a, b);
std::cout << "Swapping by reference:" << std::endl;
std::cout << "New A: " << a << " New B: " << b << std::endl;
return 0;
}
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