Question

Java Language

Question 22 Design an algorithm that will get a test score (0 to 40) from the user. Convert the test score to a percentage and display the student grade based on the following chart Grade Score More than or equals to 80% 60% to below 80% 50 %to below 60% Below 50% с Assume that the user will always enter a valid number and the algorithm You need to show the Defining diagram, algorithm and desk checking (two test cases, one valid and one invalid) (15 marks)

Answer 1

I have provided the defining diagram in handwritten format and provided the code for the same algorithm in Java with proper comments and indentation with screenshots. I hope you find it useful. If you have any doubts then please ask in the comments section. Since you didn't mentioned which question to solve? I have assumed that you are asking mainly for the Q23. Even though I provided with an algorithm and defining diagram for the same.

Defining Diagram:

Algorithm:

- Take the input of the marks

- Check if the marks are valid, if marks are invalid then print an error message and end the program

- Else calculate percentage

- Print grade according to the table given in the question

CODE:

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// Importing scanner class
import java.util.Scanner;

public class abc {
    public static void main(String args[]) {
        // defining scanner class
        Scanner in = new Scanner(System.in);
        // Prompt for asking the marks
        System.out.println("Enter you marks : ");
        // Taking input of the marks
        int marks = in.nextInt();
        // Checking if marks are invalid and printing the error message
        if(marks < 0 || marks > 40){
           System.out.println("You entered invalid marks !");
        }
        // Else calculating the percentage and printing the appropriate grade
        else{
           double percentage = (marks / 40.0) * 100;
           if(percentage >= 80) System.out.println("A Grade");
           else if (percentage >=60) System.out.println("B Grade");
           else if (percentage >=50) System.out.println("C Grade");
           else System.out.println("F Grade");
        }
    }
}

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Screenshots:

Output and Run :

For compiling you can use the following command -- "javac abc.java"

and for running you can use "java abc"