Please help me with my program

[jhawks8]

Hi I am new to Java and I am using jgrasp. My assignment is to convert celsius to fahrenheit and vice versa. I can't seem to get the right calculations, can somebody please see what is wrong?

Here is my driver:

   import java.util.Scanner;

    public class Driver
   {
       public static void main(String args[])
      {
      // Declare variables for user input
      
         double degrees;
         double Celsius;
         String scale;
         String endScale;
         double getCelsius;
         double getFahrenheit;
      // Create a Scanner object to read from the keyboard
         Scanner keyboard = new Scanner (System.in);
      
      // Get the temperature and scale from user
         System.out.print("Enter the temperature: ");
         degrees = keyboard.nextDouble();
         scale = keyboard.nextLine().trim();
      
      // Declare and instantiate an object reference variable
      
         Temperature outsideTemp = new Temperature();
      
      // Set the outside temperature based on the user input
         if (scale.equalsIgnoreCase("C"))
            outsideTemp.setCelsius(degrees);
         else
            outsideTemp.setFahrenheit(degrees);
       
         System.out.print("How would you like the temperature displayed (C or F)?");
         endScale = keyboard.nextLine();
      // Get the scale to display the temperature from the user
      
         if (endScale.equalsIgnoreCase("C"))
            System.out.print("The temperature is " + outsideTemp.getCelsius());
         else
            System.out.print("The temperature is " + outsideTemp.getFahrenheit());
               
      // Display the temperature based on the user's desired scale
         System.out.print(" degrees " + endScale);
      }
   
   }

Here is my class:

    public class Temperature
   {
   // Instance variable
      private double degreesKelvin;      // degrees in Kelvin
      double Celsius;      // degrees in Celsius    
      double Fahrenheit;
    
   // Constructor method: initialize degreesKelvin to zero
       public Temperature()
      {
         degreesKelvin = 0;
            
      }
   
   // Convert and save degreesCelius in the Kelvin scale
       public void setCelsius(double Celsius)
      {
         degreesKelvin = Celsius + 273.16;
      }
   
   // Convert degreesKelvin to Celsius and return the value
       public double getCelsius()
      {
         Celsius = degreesKelvin - 273.16;
         return Celsius;
      }
   
   // Convert and save degreesFahrenheit in the Kelvin scale
       public void setFahrenheit(double Fahrenheit)
      {
         degreesKelvin = (( 5 / 9 ) * (Fahrenheit - 32)) + 273.16;
      }
   
   // Convert degreesKelvin to Fahrenheit and return the value
   
       public double getFahrenheit()
      {
         Fahrenheit    = ((degreesKelvin - 273.16) * (9 / 5 )) + 32;
         return Fahrenheit;
      }
   
   }

Everything compiles, I just dont get the right answer.

[travishein]

I don't get why you created a class for Temperature with instance variables, where to get any conversion needs 2 calls, one to set the input and one to get the output.

would static functions work here ?

class Temperature {
  // no instance variables  (and in practice, we wouldnt create an instance even)
  
  public static double celsiusToKelvin(double celsius)
  {
    return celsius + 273.16;
  }
  
  public static double kelvinToCelsius(double degreesKelvin)
  {
   return degreesKelvin - 273.16;
  }
  
  public static double fahrenheitToKelvin(double fahrenheit)
  {
    return (( 5 / 9 ) * (fahrenheit - 32)) + 273.16;
  }
  
    public static double kelvinToFahrenheit(double degreesKelvin)
  {
   return ((degreesKelvin - 273.16) * (9 / 5 )) + 32;
  }

  public static double celciusToFahrenheit(double degreesCelsius) {
    return kelvinToFahrenheit(celsiusToKelvin(degreesCelsius));
  }
  
  public static double farenheitToCelsius(double degreesFahrenheit) {
    return kelvinToCelsius(farenheitToCelsius(degreesFahrenheit));
  }
}

so, to use this

    double degrees = keyboard.nextDouble();
    String scale = keyboard.nextLine().trim();

    double outsideTemp = 0;

    System.out.print("How would you like the temperature displayed (C or F)?");
    String endScale = keyboard.nextLine();

    // Set the outside temperature based on the user input
    if (scale.equalsIgnoreCase("C")) {
      if (endScale.equalsIgnoreCase("C")) {
        // wow, nothing to do. celcius in celcius out
        outsideTemp = degrees;
      }
      else {
        outsideTemp = Temperature.celciusToFahrenheit(degrees);
      }
    }
    else {
       if (endScale.equalsIgnoreCase("C")) {
        outsideTemp = Temperature.farenheitToCelsius(degrees);
      }
      else {
        // farenheit in, farenheit out
        outsideTemp = degrees;
      }
    }

    // Get the scale to display the temperature from the user

    System.out.print("The temperature is " + outsideTemp + " deg " + endScale);

[Eranga]

Just an info to our thread starter. Please use code tags when you posting again. Un-formatted codes are hard to read.