passbyvar.cpp

24小时攻克C++课本中的程序

 // Listing 5.4 - demonstrates passing by value
 #include <iostream>
 
 void swap(int x, int y);
 
 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 x, int y)
 {
     int temp;
     std::cout << "Swap. Before swap, x: " << x 
                                 << " y: " << y << "\n";
     temp = x;
     x = y;
     y = temp;
     std::cout << "Swap. After swap, x: " << x 
                                << " y: " << y << "\n";
 }