Letter Grade Console

import java.util.Scanner;

public class PrestonPgm03IfElse {
	
	public static void main (String args[]) {
	
		//Variable
		int testScore = 0;
				
		// Create keyboard scanner
		Scanner keyboard = new Scanner(System.in);
		
		// Get test score
		System.out.println("What is your average test score?");
		testScore = keyboard.nextInt();
		
		//Assign letter grade
		if ( testScore >= 90 && testScore <= 100 ) {
			System.out.println("Your average test score is an 'A'!");
			}
		else if ( testScore >= 80 && testScore <= 89 ) {
			System.out.println("Your average test score is an 'B'!");
			}
		else if	( testScore >= 70 && testScore <= 79 ) {
			System.out.println("Your average test score is an 'C'!");
			}
		else if ( testScore >= 60 && testScore <= 69 ) {
			System.out.println("Your average test score is an 'D'!");
			}
		else if ( testScore <= 59 ) {
			System.out.println("Your average test score is an 'F'!");
			}
		else 
			System.out.println("You did not enter a proper grade.");
	}
}