using the while loop, and scenner draft a java code that grades students when they enter makes it grades it with A,B+,B,C,C+ and F grades

Here's a Java code that uses a while loop and a Scanner to grade students based on their scores. The grading system assigns grades as A, B+, B, C+, C, and F.

import java.util.Scanner;

public class StudentGrading {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int score;
        
        while (true) {
            System.out.print("Enter the student's score (0-100) or -1 to exit: ");
            score = scanner.nextInt();

            // If the user inputs -1, exit the loop
            if (score == -1) {
                break;
            }

            // Validate the score range
            if (score < 0 || score > 100) {
                System.out.println("Invalid score! Please enter a score between 0 and 100.");
                continue; // Go back to the beginning of the loop
            }
            
            // Determine the grade based on the score
            String grade;
            if (score >= 90) {
                grade = "A";
            } else if (score >= 85) {
                grade = "B+";
            } else if (score >= 80) {
                grade = "B";
            } else if (score >= 75) {
                grade = "C+";
            } else if (score >= 70) {
                grade = "C";
            } else {
                grade = "F";
            }

            // Output the grade
            System.out.println("The student's grade is: " + grade);
        }

        // Close the scanner
        scanner.close();
        System.out.println("Grading session ended.");
    }
}

Explanation:

1. The program uses a while loop that continuously prompts the user to enter student scores until they input -1 to exit.
2. It checks if the input score is valid (between 0 and 100). If the input is invalid, it prompts the user again.
3. Based on the provided score, it determines the grade using conditional statements.
4. It outputs the corresponding grade for each entered score and terminates the loop upon entering -1.

You can compile and run this Java program to grade students based on their scores.