Function C++ Tutorial

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#include 
 
 int Doubler(int AmountToDouble);
 
 int main()
 {
     int result = 0;
     int input = 123;
 
     std::cout << "\nBefore doubler is called...";
     std::cout << "\ninput: " << input 
               << " doubled: " << result << "\n";
 
     result = Doubler(input);
 
     std::cout << "\nBack from Doubler...";
     std::cout << "\ninput: " << input 
               << " doubled: " << result << "\n\n";
 
     return 0;
 }
 
 int Doubler(int original)
 {
     if (original <= 10000)
         return original * 2;
     else
         return -1;
     std::cout << "You can't get here!\n";
 }
Before doubler is called...
input: 123 doubled: 0
Back from Doubler...
input: 123 doubled: 246