Need a little help getting started. Trying to figure out how to convert temps...

[lifeshortlivitup]

I am a java beginner and am trying to tackle a temperature conversion problem but I don't exactly know how to begin. The problem asks that I write a program that allows the user to conver either from degrees Celsius to Fahrenheit or from degrees Fahrenheit to Celsius. I have the following formulas to accomplish this already:
degreesC = 5(degreesF - 32)/9
degreesF = (9(degreesC)/5)+32

Then it asks to prompt the use to enter a temperature and either a C, c, F, or f while ignoring case(im guessing I incorporate ignore.case for this). If other than one of those are entered print an error message and ask to reenter a valid selection. (this i know how to do i think) Then convert the user entered temp to fahrenheit if celsius is entered or vice versa and ask teh user to press Q or q to quit or press any other key to repeat the loop and do another conversion.

My main problem with this problem is just getting started. How should I set up my variables in order to prompt the user to enter a temperature in number format followed by a letter? If anyone could just give me a push in the write direction I would be much obliged. Thanks!

[r035198x]

I am a java beginner and am trying to tackle a temperature conversion problem but I don't exactly know how to begin. The problem asks that I write a program that allows the user to conver either from degrees Celsius to Fahrenheit or from degrees Fahrenheit to Celsius. I have the following formulas to accomplish this already:
degreesC = 5(degreesF - 32)/9
degreesF = (9(degreesC)/5)+32

Then it asks to prompt the use to enter a temperature and either a C, c, F, or f while ignoring case(im guessing I incorporate ignore.case for this). If other than one of those are entered print an error message and ask to reenter a valid selection. (this i know how to do i think) Then convert the user entered temp to fahrenheit if celsius is entered or vice versa and ask teh user to press Q or q to quit or press any other key to repeat the loop and do another conversion.

My main problem with this problem is just getting started. How should I set up my variables in order to prompt the user to enter a temperature in number format followed by a letter? If anyone could just give me a push in the write direction I would be much obliged. Thanks!

All that time and you still had not started?
For starters, use JOptionPane.showInputDialog which asks the user to input their temperature followed by c for degreesC, f for degreesF and tell them that not putting in any units would mean the temp is in degreesC(I think I have posted this before).
your code would go like

boolean inDegreesC = false;
double temperature = 0.0;
String temp = JOptionPane.showInputDialog(null, "Enter a temp .....");
if( temp.endsWith("f") || temp.endsWith("F")) {
    inDegreesC = false;
    temperature = Double.parseDouble(temp.substring(0, temp.length() - 1));
}
else if(temp.endsWith("c") || temp.endsWith("C")) {
     temperature = Double.parseDouble(temp.substring(0, temp.length() - 1));
    inDegreesC = true; 
}
else {
     temperature = Double.parseDouble(temp);
    inDegreesC = true; 
}
 
 
 

After this inDegreesC will tell you whether or not the temperature entered is in degreesC and you can now play around with it as you please.

[lifeshortlivitup]

All that time and you still had not started?
For starters, use JOptionPane.showInputDialog which asks the user to input their temperature followed by c for degreesC, f for degreesF and tell them that not putting in any units would mean the temp is in degreesC(I think I have posted this before).
your code would go like

boolean inDegreesC = false;
double temperature = 0.0;
String temp = JOptionPane.showInputDialog(null, "Enter a temp .....");
if( temp.endsWith("f") || temp.endsWith("F")) {
    inDegreesC = false;
    temperature = Double.parseDouble(temp.substring(0, temp.length() - 1));
}
else if(temp.endsWith("c") || temp.endsWith("C")) {
     temperature = Double.parseDouble(temp.substring(0, temp.length() - 1));
    inDegreesC = true; 
}
else {
     temperature = Double.parseDouble(temp);
    inDegreesC = true; 
}
 
 
 

After this inDegreesC will tell you whether or not the temperature entered is in degreesC and you can now play around with it as you please.

I've never used JOptionPane.showInputDialog or any of the parse at all...my book has all of that listed in the "optional" section of each chapter. I think i'm way in over my head with this java stuff but thank you for this. I'll try and feel my way around in the dark and see if I can't come up with something resembling a program. If you saw the code I had been working on for this I bet you would laugh :(