#include <iostream>

int main () {
    const unsigned short ADD_SUBTRACT = 32;
    const float RATIO = 5.0/9.0;
    
    float tempratureIN, tempratureOut;
    char tempTypeIn, tempTypeOut;
    
    std::cout <<"Enter a temprature: [##.#] ";
    while (!(std::cin >> tempratureIN)) {
          std::cin.clear();
          std::cin.ignore(100, '\n');
          std::cout <<"Enter a valid temprature: [##.#] ";
          }
    
    std::cin.ignore(100, '\n');
    
    do {
        std::cout <<"Is this in degrees fahrenheit or Celsius? [F/C] ";
        std::cin >> tempTypeIn;
        std::cin.ignore(100, '\n');
        }
        
    while ((tempTypeIn != 'C')&&(tempTypeIn != 'c')&&(tempTypeIn != 'F')&&(tempTypeIn != 'f'));
    
    std::cout <<"\n";
    
    switch (tempTypeIn) {
           
           case 'C':
           case 'c':
                tempratureOut = (tempratureIN / RATIO) + ADD_SUBTRACT;
           
           tempTypeOut = 'F';
           tempTypeIn = 'C';
           
           break;
           
           case 'F':
           case 'f':
                tempratureOut = (tempratureIN - ADD_SUBTRACT) * RATIO;
                
           tempTypeIn = 'F';
           tempTypeOut = 'C';
           
           break;
           
           default:
                   tempTypeOut = 'E';
                   break;
                   }
    
    if (tempTypeOut != 'E') {
                    std::cout << tempratureIN << " Degrees " << tempTypeIn << " is equal to " << tempratureOut << " Degrees " << tempTypeOut << "\n\n";
                    }
    else {
         std::cout <<"The calculation could not be made duse to an invilad input.\n\n";
         }
         
         std::cout <<"Press Enter or Return to contiue.\n";
         std::cin.get();
         
         return 0;
         
}

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
    cout << "Enter a temperature in degrees Fahrenheit: ";
    float f;
    cin >> f;
    cout << setiosflags( ios::fixed | ios::showpoint ) << setprecision( 3 );
    cout << f << " F = " << (5.0F/9.0F)*(f - 32) << " C" << endl;

    return 0;
}