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Thread: GPA calc code... HELP

  1. #1
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    Default GPA calc code... HELP

    public class GPA_Calc 
    {
    	public void addGrade(double x)
        {
        	grade += x;
        	numtest++;
     
        	if (x >= 90)
        		gpagrade += 4;
        	else if (80 >= x && x <=89)
        		gpagrade += 3;
        	else if (70 >= x && x <=79)
        		gpagrade += 2;
        	else if (60 >= x && x <=69)
        		gpagrade += 1;
        	else if (x <= 59)
        		gpagrade += 0;
        }
     
        public GPA_Calc() 
        {
        	grade = 0;
        	numtest = 0;
        	gpagrade = 0;
        }
        public String getGrade()
        {
        	if (grade >= 90)
        		return "A";
        	else if (80 >= grade && grade <=89)
        		return "b";
        	else if (70 >= grade && grade <=79)
        		return "c";
        	else if (60 >= grade && grade <=69)
        		return "D";
        	else
        		return "F";
        }
        public double getGPA()
        {
        	return gpagrade;
        }
        private double grade;
        private double numtest;
        private double gpagrade;


    // no errors, when i enter grades likie 87 in i return F .. only when i return grades like 90+ do i get an A, also the GPA score comes out wrong because of it i think
    help!
    Last edited by helloworld922; October 13th, 2009 at 09:41 PM.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: GPA calc code... HELP

    You're constructor's not quite right. You need to initialize it the the values inputted, not just to 0.

  3. #3
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    Default Re: GPA calc code... HELP

    thats my whole problem?

  4. #4
    Super Moderator helloworld922's Avatar
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    Default Re: GPA calc code... HELP

    Oh wait, no, that's not a problem. I see what it is you're doing. hmm... I don't understand why you're getting the results you are. It seems to me that you should be getting A's almost all the time because you keep adding to grades, and never find an average grade.

    This should work:
    public void addGrade(double x)
    {
         grade = grade * numTest + x;
         numTest++;
         grade /= numTest;
         if (grade >= 90)
         {
              gpa = 4;
         }
         else if (grade >= 80)
         {
              gpa = 3;
         }
         else if (grade >= 70)
         {
              gpa = 2;
         }
         else if (grade >= 60)
         {
              gpa = 1;
         }
         else
         {
              gpa = 0;
         }
    }