This is Java Programming. This assignment tries to ensure that the students know

Question

This is Java Programming.

This assignment tries to ensure that the students know the if-else statement and switch statement.

Objectives:

1. The structures of if-else branching

2. The structures of switch branching

3. Know that all switch branching can be covert to if-else branching

QUESTION:

Write a game program. The computer will ask the user to input a score. The program will first check if the score is valid (between 0 and 100, inclusive). If the score is not valid, print out the error message and exit the program. Otherwise, display the corresponding letter grade.

REQUIREMENTS:

1. You need first use if statement to decide whether the input is valid. If not, print out the error message and exit the program.

2. You need use if-else structure to display the letter grade.

3. Comment away the code (do NOT delete it) and rewrite it by using switch structure (please notice that in general, you may not be able to rewrite an if-else statement to switch statement. However, in this particular case, there is a trick to do so easily)

4. In this program, we don’t validate user’s input. We assume that user will enter a score between 0 and 100 inclusive. After we study loop, we can validate the input. As long as the user’s input is out of the legal range, the program will keep to prompt the user to enter a legal score

Sample Runs: The user input is in Bold and Italic

Sample Run One:

Enter your score (0 -- 100): 86

Your grade is: B

Sample Run Two:

Enter your score (0 -- 100): 91

Your grade is: A

Explanation / Answer

import java.util.Scanner; public class ScoreGrade { public static void main(String[] args) { Scanner in = new Scanner(System.in); double score = 0; while (true) { System.out.print("Enter your score (0 -- 100): "); score = in.nextDouble(); if(score >= 0 && score = 90) { grade = 'A'; } else if(score >= 80) { grade = 'B'; } else if(score >= 70) { grade = 'C'; } else if(score >= 60) { grade = 'D'; } else { grade = 'F'; } System.out.println("Your grade is: " + grade); } }

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