[c-prog] Re: Help with conversion - from Celsius to Fahrenheit

[drednot]

I wrote this utility in C++:

#include <cstdlib>
#include <iostream>

using namespace std;

int main()
{
    float f = 0.0;
    float c = 0.0;
    float frac = 0.0;
    const float adj = 32.0;
    int uChoice = 0;
    bool lFlag = false;
    
    do
    {
         system("CLS");
         cout << "Temperature conversion utility, F to C and C to F.\n\n";
         cout << "Please choose:\n";
         cout << "  1.  degrees F to degrees C\n";
         cout << "  2.  degrees C to degrees F\n\n";
         
         cout << "Your choice --> ";
         cin >> uChoice;
         
         switch(uChoice)
         {
                case 1: frac = 5.0/9.0;
                        cout << "Please enter the temp in degrees F --> ";
                        cin >> f;
                        c = frac * (f - adj);
                        cout << "\nTemp in degrees C = " << c << "\n";
                        lFlag = true;
                        break;
                case 2: frac = 9.0/5.0;
                        cout << "Please enter the temp in degrees C --> ";
                        cin >> c;
                        f = (frac * c) + adj;
                        cout << "\nTemp in degrees F = " << f << "\n";
                        lFlag = true;
                        break;
                default: cout << "\nExiting...\n\n";
                         lFlag = false;
         };
         
         system("PAUSE");
         
     }while(lFlag != false);
    
    return EXIT_SUCCESS;
}

Notice where the parentheses are within the formulas -- they're important.  
Hope this helps.

Cheers.