manyreturns.cpp

24小时攻克C++课本中的程序

 // Listing 5.5 - demonstrates multiple return
 // statements
 #include <iostream>

 int Doubler(int AmountToDouble);

 int main()
 {
     int result = 0;
     int input;

     std::cout << "Enter a number between 0 and "
               << "10,000 to double: ";
     std::cin >> input;

     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";
 }