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  1.     #include <iostream>
  2.     using std::cin;
  3.     using std::cout;
  4.  
  5.     static const double USD_TO_MXN = 12.99;
  6.     static const double GBP_TO_MXN = 22.03;
  7.     static const char DATA_DATE[] = "6/12/2014";
  8.  
  9.     void convert(const char* from, const char* to, double exchange)
  10.     {
  11.         cout << "Enter the number of " << from << " to convert to " << to << ".\n"
  12.                      "Amount: ";
  13.         int original;
  14.         cin >> original;
  15.         cout << '\n' << original << ' ' << from << " gives " << int(original * exchange) << ' ' << to << ".\n";
  16.     }
  17.  
  18.     int main()  // this is valid since C++2003
  19.     {
  20.         cout << "Foreign Currency Converter\n"
  21.                 "1 USD = " << USD_TO_MXN << " MXN (" << DATA_DATE << ")\n"
  22.                 "1 GBP = " << GBP_TO_MXN << " MXN (" << DATA_DATE << ")\n"
  23.                 "\n";
  24.  
  25.         for ( ; ; ) {   // continuous loop
  26.             cout << "Which conversion do you want to perform?\n"
  27.                     "[1] USD to MXN\n"
  28.                     "[2] MXN to USD\n"
  29.                     "[3] GBP to MXN\n"
  30.                     "[4] MXN to GBP\n"
  31.                     "[0] Quit\n"
  32.                     "Selection: ";
  33.             int choice = -1;
  34.             cin >> choice;
  35.             cout << '\n';
  36.  
  37.             switch (choice) {
  38.                 case 0:
  39.                     return 0;       // return from main
  40.  
  41.                 case 1:
  42.                     convert("US Dollars", "Pesos", USD_TO_MXN);
  43.                     break;
  44.  
  45.                 case 2:
  46.                     convert("Pesos", "US Dollars", 1 / USD_TO_MXN);
  47.                     break;
  48.  
  49.                 case 3:
  50.                     convert("British Pounds", "Pesos", GBP_TO_MXN);
  51.                     break;
  52.  
  53.                 case 4:
  54.                     convert("Pesos", "British Pounds", 1 / GBP_TO_MXN);
  55.                     break;
  56.  
  57.                 default:
  58.                     cout << "Invalid selection. Try again.\n";
  59.             }
  60.         }
  61.     }
  62.  
Success #stdin #stdout 0s 3304KB
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stdin
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stdout
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Foreign Currency Converter
1 USD = 12.99 MXN (6/12/2014)
1 GBP = 22.03 MXN (6/12/2014)

Which conversion do you want to perform?
[1] USD to MXN
[2] MXN to USD
[3] GBP to MXN
[4] MXN to GBP
[0] Quit
Selection: 
Enter the number of US Dollars to convert to Pesos.
Amount: 
5 US Dollars gives 64 Pesos.
Which conversion do you want to perform?
[1] USD to MXN
[2] MXN to USD
[3] GBP to MXN
[4] MXN to GBP
[0] Quit
Selection: 
Enter the number of Pesos to convert to US Dollars.
Amount: 
130 Pesos gives 10 US Dollars.
Which conversion do you want to perform?
[1] USD to MXN
[2] MXN to USD
[3] GBP to MXN
[4] MXN to GBP
[0] Quit
Selection: 
Enter the number of British Pounds to convert to Pesos.
Amount: 
9 British Pounds gives 198 Pesos.
Which conversion do you want to perform?
[1] USD to MXN
[2] MXN to USD
[3] GBP to MXN
[4] MXN to GBP
[0] Quit
Selection: 
Enter the number of Pesos to convert to British Pounds.
Amount: 
221 Pesos gives 10 British Pounds.
Which conversion do you want to perform?
[1] USD to MXN
[2] MXN to USD
[3] GBP to MXN
[4] MXN to GBP
[0] Quit
Selection:
https://ideone.com/iCXrpU
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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