Floats using BigDecimal

Question

I am trying to float my answer using BigDecimal, anyone have any suggestions? PLease Help.
import java.lang.reflect.*;
import java.awt.*;
import java.io.*;
import java.math.*;
class myMean
          public float myMean(float x)     
               float result = 0;     
               result = (x += result);
               return (result);     
class MethodCalls
     public static void main(String[] args) throws IOException
          // declarations
          BufferedReader in = new BufferedReader (new InputStreamReader(System.in));
          myMean out = new myMean();     
          String sArraySize, strgrade, strdecimal;                    
          double size =2;
          float score = 0, tracker = 0;      
          float FloatConversion;
          float callAverageMethod;
          int x= 0;
          System.out.println("Please enter the number of tests to average:");
          sArraySize = in.readLine();           
          size = Double.parseDouble(sArraySize);      
          System.out.println("Please enter the amount of decial places to use:");
          strdecimal = in.readLine();
          x = Integer.parseInt(strdecimal);
          for (float counter=0; counter < size; counter++)     
               // input on the test scores come here          
               System.out.print("What is the score of the " + (counter+1) + " test: ");
               strgrade = in.readLine();
               score = Float.parseFloat(strgrade);
               tracker += score ;          
          callAverageMethod = out.myMean(tracker);
          System.out.println();      
          BigDecimal bd = new BigDecimal(callAverageMethod);
bd = bd.setScale(x, BigDecimal.ROUND_UP);
          System.out.println(" The average score of the " + size + " tests is: " + bd/size);
}

Answer 1

Try doing the computation ( sum / num grades ) within the BigDecimal. If you create the BigDecimal and then do the integer division, you'll create a new double that isn't subject to the rounding.
public class bdtest {
    public bdtest() {
    public static void main(String[] args) {
        float f = 100.0f;
        int n = 6;
        BigDecimal bd = new BigDecimal( f / n );
        bd = bd.setScale( 2, BigDecimal.ROUND_UP );
        System.out.println( bd );
}