demobyref.cpp

Code

/*
 *   demobyref.cpp
 *   CIS 250
 *   David Klick
 *   2006-01-30
 *
 *   Demonstration of passing by reference
 */

#include <iostream>

void change1(int);
void change2(int *);

int main(void) {
    using std::cout;
    using std::endl;

    int x = 0;
    cout << "Before calling functions: " << x << '\n';
    change1(x);
    cout << "After change1() function: " << x << '\n';
    change2(&x);
    cout << "After change2() function: " << x << '\n';

    return 0;
}

void change1(int n) {
    n = 1;
}

void change2(int *n) {
    *n = 2;
}
/*
    Sample output:

    Before calling functions: 0
    After change1() function: 0
    After change2() function: 2
*/