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Thread: For loops

  1. #1
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    Default For loops

    I can't figure out what I am missing, I think I need a break somewhere inside the for loops but I don't know exactly where I would put it, because once it gets to the first for loop it just keep looping and won't continue past it.

    import java.util.Scanner;
     
    public class ********CalculateGrades {
    	public static void main(String[] args) {
     
    		Scanner sc = new Scanner(System.in);
     
    		final int Assignments = 6;
    		final int Tests = 2;
    		double AssignmentAvg;
    		double TestAvg;
    		int Final;
    		int Lab;
    		double Avg;
     
    		int[] AGrade = new int[Assignments];
    		int[] TGrade = new int[Tests];
     
    		System.out.println("Would you like to calculate your grades now?(y/n)");
    		String Input = sc.nextLine();
     
    		while(Input.equals("y") || Input.equals("Y")) {
     
    			System.out.println("Enter your" + Assignments + " assignment grades.");
     
    			for(int index = 0; index < Assignments; index++) {
    				System.out.print("Assignment #" + (index + 1) + ": ");
    				AGrade[index] = sc.nextInt();
     
    				double lowest = AGrade[0];
    				if(AGrade[index] < lowest) {
    					lowest = AGrade[index];
    				}
    				AssignmentAvg = (AGrade[index] - lowest) / Assignments;
    			}
    			System.out.println("Enter your" + Tests + " test grades.");
     
    			for(int index = 0; index < Tests; index++) {
    				System.out.print("Test #" + (index + 1) + ": ");
    				TGrade[index] = sc.nextInt();
    				TestAvg = TGrade[index] / Tests;
    			}
     
    			System.out.println("Enter your lab grade");
    			Lab = sc.nextInt();
     
    			System.out.println("Enter your final grade");
    			Final = sc.nextInt();
     
    			Avg = (AssignmentAvg * .25) + (TestAvg * .30) + (Lab * .25) + (Final * .20);
     
    			if(Avg >= 90) {
    				System.out.println("Your grade is an A, and your average is " + Avg + ".");
    			}else if(Avg >= 80) {
    				System.out.println("Your grade is a B, and your average is " + Avg + ".");
    			}else if(Avg >= 70) {
    				System.out.println("Your grade is a C, and your average is " + Avg + ".");
    			}else if(Avg >= 60) {
    				System.out.println("Your grade is a D, and your average is " + Avg + ".");
    			}else if(Avg < 60) {
    				System.out.println("Your grade is an F, and your average is " + Avg + ".");
    			}
     
    			System.out.println("Do you want to calculate the grade of another student?");
    			Input = sc.nextLine();
    		}
    	System.out.println("Thank you for using my Average Calculator, Bye bye!!");
    	}
    }


  2. #2
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    Default Re: For loops

    I have moved your post to a more appropriate category.

    Please explain your problem more. A for loop is a for loop, so it should end unless something from within prevents this. For example, you ask for user input - do you prompt the user for input? Add some more println's in there to determine where the program hangs.

  3. #3
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    Default Re: For loops

    What it is doing is going through the first for loop, asking for the grade of each assignment, but then when it gets to the 6th assignment it won't continue on with the code, it just goes back to the first assignment.

    Edit:/

    Actually I take that back it is not even doing that, I think the reason it was doing that is because the old .class file was from when I compiled it earlier in the code with just the first for statement, I am just getting 2 errors now and I have no clue why and when I try to run it it says cannot find the class file.

    C:\Users\Joseph Chastain\Desktop\CS Class\Assignments\ChastainJosephCalculateGrades.ja va:58: error: variable AssignmentAvg might not have been initialized
    Avg = (AssignmentAvg * .25) + (TestAvg * .30) + (Lab * .25) + (Final * .20);
    ^
    C:\Users\Joseph Chastain\Desktop\CS Class\Assignments\ChastainJosephCalculateGrades.ja va:58: error: variable TestAvg might not have been initialized
    Avg = (AssignmentAvg * .25) + (TestAvg * .30) + (Lab * .25) + (Final * .20);
    ^
    2 errors
    Last edited by JCTexas; September 21st, 2011 at 03:37 PM.

  4. #4
    Super Moderator copeg's Avatar
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    Default Re: For loops

    am just getting 2 errors now and I have no clue why and when I try to run it it says cannot find the class file.
    The description of those errors says it all - one of your variables may not have been initialized. Quick fix is to initialize this variable to a particular value (for example 0)

  5. #5
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    Default Re: For loops

    See Error in code

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