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Ace the AP Computer Science Exam for High Schoolers

Solution Review: Assign Grades to Students

Explore how to write a Java method that assigns letter grades based on numeric scores using if and else if statements. Understand how conditional logic directs program flow and produces specific output messages. Practice modifying inputs to see real-time changes in grade assignments.

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Rubric criteria

Solution

Java
class GradingSystem 
{
    public static void main(String args[]) 
    {
        System.out.println(assignGrades(75));
    }
    // Function assigning the grades
    public static char assignGrades(double score) 
    {
        if (score == 100) 
        {
            System.out.println("Superb");
            return 'A';
        }
        else if (score >= 90) 
        {
            System.out.println("Excelent");
            return 'A';
        }
        else if (score >= 80) 
        {
            System.out.println("Very Good");
            return 'B';
        }
        else if (score >= 70) 
        {
            System.out.println("Good");
            return 'C';
        }
        else if (score >= 60) 
        {
            System.out.println("Work Hard");
            return 'D';
        }
        else 
        {
            System.out.println("Fail");
            return 'F';
        }
    }
}

Rubric-wise explanation

Point 1:

Look at line 9. We declare the header of the assignGrades() function: public static char assignGrades(double score). We add the static keyword so that we can directly call this method in the main function without any instance.

Point 2, 3, 4:

  • Look at line 11. We add a condition next to an if keyword. If the score is equal to 100100, then we ...