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  1.     #include <iostream>
  2.  
  3.     static const double US_TO_MXN = 12.99;
  4.     static const char DATA_DATE[] = "6/12/2014";
  5.  
  6.     void convert(const char* from, const char* to, double exchange)
  7.     {
  8.         std::cout << "Enter the number of " << from << " to convert to " << to << ".\n"
  9.                      "Amount: ";
  10.         int original;
  11.         std::cin >> original;
  12.         std::cout << to << ": " << (original * exchange) << '\n';
  13.     }
  14.  
  15.     int main()  // this is valid since C++2003
  16.     {
  17.         std::cout << "US/MXN Converter\n"
  18.                      "1 US = " << US_TO_MXN << " MXN (" << DATA_DATE << ")\n"
  19.                      "\n";
  20.  
  21.         int choice = 0;
  22.         // Here's a better demonstration of goto
  23.     GET_CHOICE:
  24.         std::cout << "Which conversion do you want to perform?\n"
  25.                     "[1] US to MXN\n"
  26.                     "[2] MXN to US\n"
  27.                     "Selection: ";
  28.         std::cin >> choice;
  29.  
  30.         if (choice == 1)
  31.             convert("US Dollars", "Pesos", US_TO_MXN);
  32.         else if (choice == 2)
  33.             convert("Pesos", "US Dollars", 1 / US_TO_MXN);
  34.         else {
  35.             std::cerr << "Invalid choice. Please try again.\n";
  36.             goto GET_CHOICE;
  37.         }
  38.  
  39.         // this also serves to demonstrate that goto is bad because
  40.         // it's not obvious from the above that you have a loop.
  41.     }
  42.  
Success #stdin #stdout 0s 3344KB
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US/MXN Converter
1 US = 12.99 MXN (6/12/2014)

Which conversion do you want to perform?
[1] US to MXN
[2] MXN to US
Selection: Enter the number of US Dollars to convert to Pesos.
Amount: Pesos: 259.8
https://ideone.com/qwpRtQ
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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