Need help for loooop

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i have to write a Java program to compute the grades of many students. The program
should read the number of students then, for each student, read 3 scores. i did wrote a code to read from user to calculate for a single student.

What I have tried:

public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter Score of TMA :");
        double TMA = input.nextDouble();
        System.out.println("Enter Score of MTA :");
        double MTA = input.nextDouble();
        System.out.println("Enter final exam score :");
        double exam = input.nextDouble();
        String grd=theGrads(TMA,MTA,exam);
        System.out.println("the grade is: " + grd);

    }

    public static String theGrads  (double TMA,double MTA , double exam) {
        double total =TMA + MTA + exam;

        String grade = "";

        if(total>=90)
            grade="A";
        else if(total >=80 && total <90)
            grade="B";
        else if(total >=70 && total <80)
            grade="C";
        else if(total >=60 && total <70)
            grade="D";
        else
            grade="F";

        return grade;

    }
}

Posted 23-Oct-21 7:45am

ventus sol

Updated 23-Oct-21 8:27am

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Comments

Patrice T 23-Oct-21 13:57pm

Did you read the documentation about 'loops' ?
What you don't understand ?

ventus sol 23-Oct-21 14:19pm

i tried to read from user number of students but dont know how

gggustafson 23-Oct-21 14:38pm

First, "of many students" suggests that you need to loop over input until you've read all the data. Second, if there is a need to keep the values for later use, then you need to save the data in some data structure; I assume there is no such need.

Pseudo-code for the program is:

    read number_of_students
    for each student
        {
        read the 3 scores
        compute the letter grade
        print the results
        }

The for loop would expand to

    for ( int i = 0; ( i < number_of_students ); i++ )

I strongly suggest that you write three methods:

    read_scores ( )
    compute_letter_grades ( )
    print_letter_grade ( )

Your method "theGrads" should be renamed "compute_letter_grades". Also why are you using double rather than float or integer. Is there a need for such precision?

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OriginalGriff · Answer 1 · 2021-10-23T08:27:00

Solution 1

You will need a collection to keep "many students" in - and array or List will do (depending on what your teacher has been talking about recently - use that).

Then you will need a loop: Loops in Java | Java For Loop - Javatpoint[^] explains them.

Posted 23-Oct-21 8:27am

OriginalGriff

Comments

gggustafson 23-Oct-21 14:41pm

Only if OP needs to keep the values for later use. Seeing the trivial nature of the problem, I don't think OP is ready for data structures.