/** Cube a variable using pass by reference with a pointer. */
#include <iostream>
using namespace std;
void cubeByReference(int *);   // prototype

int main()
{
    int number = 5;
    cout << "The original value of number is " << number << endl;
    cubeByReference(&number);
    cout << "The new value of number is " << number << endl;
    return 0;
}

/** Cube the integer pointed to by nPtr. */
void cubeByReference(int *nPtr)
{
    // *nptr'' is an alias for the variable passed in.
    *nPtr = (*nPtr) * (*nPtr) * (*nPtr); // parenthesis for readability
}