// Listing 5.7 - demonstrates inline functions
 #include <iostream>

 inline int Doubler(int);

 int main()
 {
     int target;

     std::cout << "Enter a number to work with: ";
     std::cin >> target;
     std::cout << "\n";

     target = Doubler(target);
     std::cout << "Target: " << target << std::endl;

     target = Doubler(target);
     std::cout << "Target: " << target << std::endl;

     target = Doubler(target);
     std::cout << "Target: " << target << std::endl;
     return 0;
 }

 int Doubler(int target)
 {
     return 2*target;
 }