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Thread: Doing my head in! "for" loops

  1. #1
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    Default Doing my head in! "for" loops

    Hey, i'm stuck on a code. In terms of formatting it is printing out what i need, but the final degree values are displaying all the same. each new 'carbon value' should create a new value for the surface temperature. my equation is correct, but the code to get it to pick up the right carbon value I just cant figure out....

    public class StageFour
    {
          public static void main(String[] args)
          {
              //Adding Carbon
              //Problem Parameters
              final double SOLAR_CONSTANT = 1367.0;
              final double ALBEDO = 0.3;
              final double STEFANBOLTZMANN = 5.67E-8;
              final double ORBITAL_RADIUS = 1.0;
     
              //Declare Variable
              double surfaceTemperature; 
              int number;        
     
              //Create a decimal format object
              DecimalFormat df = new DecimalFormat("#0.00");
     
             //Equation.
              for (number = 280; number <= 400; number += 5)
              {
                  surfaceTemperature = Math.pow((((SOLAR_CONSTANT/4)*(1.0 - ALBEDO))/(STEFANBOLTZMANN*(1.0 - (0.65 + (0.1 + 0.06*Math.log((number)/280)))/2)*(ORBITAL_RADIUS*ORBITAL_RADIUS))), 0.25) - 273.15;
                  System.out.println("For a Carbon Level of " + number + " the Earth's Surface Temperature is " + (df.format(surfaceTemperature)) + "\u00b0" );
              }
          }
    }

    I should be getting lines printed from 280 to 400 with increments of 5, calculating eachof these numbers into my formula to get the appropriate degrees. on paper the equation works..

    I should get something that spits numbers out like
    For a Carbon Level of 280 the Earth's Surface Temperature is 13.49°
    For a Carbon Level of 285 the Earth's Surface Temperature is 13.55°
    For a Carbon Level of 290 the Earth's Surface Temperature is 13.61°
    For a Carbon Level of 295 the Earth's Surface Temperature is 13.67° etc

    but it just spits out all the same degrees values of 13.49 for each carbon level number.

    Is anyway able to point out where I have gone wrong in my coding? I cant find any examples to help me out..

    Cheers guys
    Last edited by helloworld922; May 24th, 2013 at 02:39 PM. Reason: please use [code] tags


  2. #2
    Member angstrem's Avatar
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    Default Re: Doing my head in! "for" loops

    Math.log((double)(number)/280)
    Got it?)
    Int/Int = Int and not Double

  3. The Following User Says Thank You to angstrem For This Useful Post:

    jess91 (May 24th, 2013)

  4. #3
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    Default Re: Doing my head in! "for" loops

    Man I was racking my brain. Cheers, that worked
    So Happy, Thankyou!!!!

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