list0506.cpp

teach yourself C++ in 21 days 第五版

// Listing 5.6 - demonstrates multiple return
// statements
#include <iostream>
  
int Doubler(int AmountToDouble);
  
int main()
{
   using std::cout;
  
   int result = 0;
   int input;
  
   cout << "Enter a number between 0 and 10,000 to double: ";
   std::cin >> input;
  
   cout << "\nBefore doubler is called... ";
   cout << "\ninput: " << input << " doubled: " << result << "\n";
  
   result = Doubler(input);
  
   cout << "\nBack from Doubler...\n";
   cout << "\ninput: " << input << "   doubled: " << result << "\n";
  
   return 0;
}
  
int Doubler(int original)
{
   if (original <= 10000)
      return original * 2;
   else
      return -1;
   std::cout << "You can't get here!\n";
}