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Java Program: Grade Evaluation with Combined Logical Expressions

Logic Used

We evaluate grade using combined logical expressions:

Marks Range	Grade
90–100	A
75–89	B
60–74	C
40–59	D
0–39	F

Logical operators used:
&& (AND), || (OR), ! (NOT)

Java

import java.util.Scanner;
 
public class GradeEvaluation {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter marks (0-100): ");
        int marks = sc.nextInt();
 
        String grade;
 
        if (marks >= 90 && marks <= 100) {
            grade = "A";
        }
        else if (marks >= 75 && marks < 90) {
            grade = "B";
        }
        else if (marks >= 60 && marks < 75) {
            grade = "C";
        }
        else if (marks >= 40 && marks < 60) {
            grade = "D";
        }
        else if (marks >= 0 && marks < 40) {
            grade = "F";
        }
        else {
            grade = "Invalid Marks!";
        }
 
        System.out.println("\n------ Grade Evaluation ------");
        System.out.println("Marks Entered : " + marks);
        System.out.println("Grade Awarded : " + grade);
 
        sc.close();
    }
}

Output

 
INPUT :
Enter marks (0-100): 82

OUTPUT :
------ Grade Evaluation ------
Marks Entered : 82
Grade Awarded : B

Explanation

How Grade is Calculated Using Combined Logical Expressions?

1. Check for Grade A

marks >= 90 && marks <= 100

Both conditions must be true → AND (&&)

2. Check for Grade B

marks >= 75 && marks < 90

3. Check for Grade C

marks >= 60 && marks < 75

4. Check for Grade D

marks >= 40 && marks < 60

5. Check for Grade F

marks >= 0 && marks < 40

6. Invalid Input

If marks are less than 0 OR greater than 100:

else {

grade = "Invalid Marks!";

}

This uses NOT of valid range implicitly.

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Operators & Expressions

Java Program: Grade Evaluation with Combined Logical Expressions

Output

Explanation