/* Original author: Michele Co, CS 216, Spring 2007 * Updated by Aaron Bloomfield, CS 2150, Spring 2017 * Filename: pointers.cpp * Description: Examples demonstrating pointers and C++ syntax related to pointers * * To force 64-bit operation, this file will have to be compiled with * the -m64 flag */ #include <iostream> using namespace std; int main() { // declare and initialize some int variables (we use longs to // ensure 64-bit operation) long y = 5; long x = 1; // declare a pointer to int and initialize to the address of x long * x_pointer = &x; // print the values of each of these variables cout << "x = " << x << endl; cout << "y = " << y << endl; cout << "x_pointer = " << x_pointer << endl; cout << "*x_pointer = " << *x_pointer << endl << endl; // change the value of the memory pointed to by x_pointer // by dereferencing and assigning a new value *x_pointer = 2; // print the values of all variables cout << "After *x_pointer = 2 " << endl; cout << "x = " << x << endl; cout << "y = " << y << endl; cout << "x_pointer = " << x_pointer << endl; cout << "*x_pointer = " << *x_pointer << endl << endl; // change the address that x_pointer points to, to y x_pointer = &y; // print the values of all variables cout << "After x_pointer = &y " << endl; cout << "x = " << x << endl; cout << "y = " << y << endl; cout << "x_pointer = " << x_pointer << endl; cout << "*x_pointer = " << *x_pointer << endl << endl; // change the value of the memory pointed to by x_pointer // by dereferencing and assigning a new value *x_pointer = 3; // print the values of all variables cout << "After *x_pointer = 3 " << endl; cout << "x = " << x << endl; cout << "y = " << y << endl; cout << "x_pointer = " << x_pointer << endl; cout << "*x_pointer = " << *x_pointer << endl << endl; return 0; }