2. Address of a C++ variable

The ampersand operator & returns address of the variable:

#include <iostream>
using namespace std;
int main( )
{
    int x = 5;
    double d = 0.1;

    // Taking variable addresses:
    cout << &x << '\n';
    cout << &d << '\n';

    return 0;
}

/* Program might print something like this:
0012FF2C
0012FF1C
*/

expression &x returns address of x

expression &d returns address of d

In C++, taking address of a variable is so common, that a separate punctuation syntax was dedicated to this operation!