// Written by Rono - June 27, 2006#include <iostream>  
 using namespace std;  
  
#include <iomanip>  
 using std::setprecision;#include <string>  
int main()  
{  
 double fahrenheitValue = 0; // The temperature in Fahrenheit  
 double celsiusValue = 0; // The temperature in Celsius int unitChoice = 0; // Used to determine which the user wants to convert  
 int whileLoop = 1; // Variable for the loop string badInput; // String used for any bad input handling from user while(whileLoop != 0) // Main loop for conversions  
 {  
  cout << "\nDo you want to convert Fahrenheit to Celsius or Celsius to Fahrenheit?\n\n";  
  cout << "Enter \"1\" for Fahrenheit to Celsius\n" ;  
  cout << "Enter \"2\" for Celsius to Fahrenheit\n\n";  if(!(cin >> unitChoice)) // User enters choice (also error handling if user enters wrong data type)  
  {     
   cin.clear(); // Clears input stream  
   cin >> badInput; // Stores bad input to a string to repair input stream  
   cout << "\nInvalid data type entered!\n";  
   cout << "Please try again.\n" << endl;  
  }  else if(unitChoice == 1) //First conversion method - Fahrenheit to Celsius  
  {  
   cout << "\nYou have chosen to convert Farenheit to Celsius.\nPlease enter the temperature in Farenheit.\n";  
    if(!(cin >> fahrenheitValue))// Error handling again  
    {  
     cin.clear();  
     cin >> badInput;  
     cout << "\nInvalid data type entered!\n";  
     cout << "Please try again.\n" << endl;  
    }    else // Conversion is performed for Fahrenheit to Celsius  
    {  
     celsiusValue = 5 * (fahrenheitValue - 32) / 9; // Conversion of fahrenheit to Celsius  
     cout << "\nThe temperature for " << fahrenheitValue << " degrees Fahrenheit in Celsius is "  
     << setprecision(4) << fixed << celsiusValue << " degrees.\n\n"; // Decimal precision is set to four places using fixed and setprecision from the std namespace and <iomanip> library  
     cout << "To convert another temperature, enter \"1\". To end this program, enter \"0\".\n" << endl;  
     cin >> whileLoop; // User enters whether or not they want to convert another temperature  
    }  
  }  else if(unitChoice == 2) // Second conversion method - Celsius to Fahrenheit  
  {  
   cout << "\nYou have chosen to convert Celsius to Fahrenheit.\nPlease enter the temperature in Celsius.\n";  
  
    if(!(cin >> celsiusValue)) // Error handling again  
    {  
     cin.clear();  
     cin >> badInput;  
     cout << "\nInvalid data type entered!\n";  
     cout << "Please try again.\n" << endl;  
    }    else // Conversion performed for Celsius to Fahrenheit  
    {  
     fahrenheitValue = 9 * celsiusValue / 5 + 32; // Conversion of Celsius to Fahrenheit  
     cout << "\nThe temperature for " << celsiusValue << " degrees Celsius in Fahrenheit is "  
     << setprecision(4) << fixed << fahrenheitValue << " degrees.\n\n";  
     cout << "To convert another temperature, enter \"1\". To end this program, enter \"0\".\n" << endl;  
     cin >> whileLoop;  
    }  
  }  else // If user enters an integer other than 1 or 2, the program loops and asks for another  
  {  
   cout << "You have entered an invalid choice.\n" << endl;  
   whileLoop = 1; // Loop repeats  
  } }  
  
 return 0;  
}