passbyref.cpp

24小时攻克C++课本中的程序

 //Listing 11.6 Demonstrates passing by reference
 // using references!
 #include <iostream>

 void swap(int &x, int &y); 
 // the "&" says that the function expects to get references
 int main()
 {
     int x = 5, y = 10;

     std::cout << "Main. Before swap, x: " << x
                                 << " y: " << y << "\n";
     swap(x,y);
     std::cout << "Main. After swap, x: " << x
                                << " y: " << y << "\n";
     return 0;
 }

 void swap (int &rx, int &ry)
 {
     int temp;

     std::cout << "Swap. Before swap, rx: " << rx
                                 << " ry: " << ry << "\n";

     temp = rx;
     rx = ry;
     ry = temp;

     std::cout << "Swap. After swap, rx: " << rx
                                << " ry: " << ry << "\n";
 }