> Hi again.
>
> I've worked on doing an application to convert celsius to
> fahrenheit and visa-versa but it's not compiling and i
> can't seem to solve the errors. If anyone has a chance to
> take a look here's the code:
> It comes in 2 parts.. 1 class with the equation and 1
> class to control the user input:
> 1st Class:
>
> > import javax.swing.*;
> import java.lang.*;
> import java.io.*;
> import java.util.*;
>
> public class Equation {
>
> public static float convertF(float temp)
>
> { fahrenheit = (centigrade*1.8f) + 32; }
>
> public static float convertC(float temp)
>
> { centigrade = (fahrenheit/32)/1.8f; }
> }
>
> 2nd Class:
>
> > import javax.swing.*;
> import java.lang.*;
> import java.io.*;
> import java.util.*;
>
> public class Temperature {
>
> String input = JOptionPane.showInputDialog(null, "Enter
> which temperature you wish to convert using C or F:");
> String temp = String.parseString(input);
> {
>
> if(temp.equals("C"));
>
> String input1 = JOptionPane.showInputDialog(null, "Enter
> Temperature in Centigrade to convert:");
> float centigrade = Equation.convertF(input1);
>
> {
>
> if(temp.equals("F"));
>
> String input2 = JOptionPane.showInputDialog(null, "Enter
> Temperature in Fahrenheit to convert:");
> float fahrenheit = Equation.convertC(input2);
> }
> }
> }
>
>
> Thanks if anyone can spot my errors.
>
> Chris.
Where do I begin?? The whole program is flawed.
Starting with your method:
public static float convertF(float temp)
The signature is public (meaning it is accessible
from any other class), static means the method can
only be called as follows:
ClassName.convertF(some_value);
float means it *MUST* return *SOMETHING* your method
returns nothing.
Here is an example:
public static float convertF(float value_I_want_to_convert){
float faranheit = 0.0;
faranheit = (do_your_calculation_here);
// return the value you have converted
return farenheit;
}
When you want to retrieve this value you make the
following call if the name of the Class containing
the method is "MyClass":
MyClass.convertF(value_to_convert);
There is no such a String method:
String temp = String.parseString(input);
I assume what you wanted was:
// note the use of Upper and Lower cases
float temp = Float.parseFloat(input);
// Primitive float temp = Object Float.parse blah blah
Your friendly Java reference.
http://java.sun.com/j2se/1.5.0/docs/api/
Go through the classes in the above API.
Go through Float. Note that the signature for the
method parseFloat is static which is why we call
it by: "Float.parseFloat(String)"
As opposed to:
// INCORRECT
Float fizzo - new Float();
fizzo.parseFloat();
You have a lot of work ahead. Go through a Java
Tutorial with regards to Classes and Methods
and refer to the Java API for all classes that
come as part of the standard Java Library.
There are a whole bunch of other errors such as
faranheigh *MUST* be declared in some capacity
(global or local) before its used:
// this is effortless
float faranheit = 0.0;
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