Java switch statement convert letter grade to number

Question

We would like to write a program that prompts the user to enter a letter grade A, B, C, D, or F.

Display its corresponding numeric value 4, 3, 2, 1, or 0.

Here is a sample run: 

Enter a letter grade: B 
The numeric value for grade B is 3 

Enter a letter grade: T 
T is an invalid grade 

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    // Prompt the user to enter a letter grade A, B, C, D or F
    System.out.print("Enter a letter grade: ");
    String s = input.nextLine();//from  w  ww .j a  v  a  2 s  . co m
    char ch = s.charAt(0);
    ch = Character.toUpperCase(ch);
    
    //your code here
  }
}





import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    // Prompt the user to enter a letter grade A, B, C, D or F
    System.out.print("Enter a letter grade: ");
    String s = input.nextLine();
    char ch = s.charAt(0);
    ch = Character.toUpperCase(ch);
    
    if (ch >= 'A' && ch <= 'F' && ch != 'E')
    {
      System.out.print("The numeric value for grade " + ch + " is ");
      switch(ch)
      {
        case 'A': System.out.println(4); break;
        case 'B': System.out.println(3); break;
        case 'C': System.out.println(2); break;
        case 'D': System.out.println(1); break;
        case 'F': System.out.println(0); 
      }
    }
    else
      System.out.println(ch + " is an invalid grade");
  }
}



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