*4.13 (Vowel or consonant?) Write a program that prompts the user to enter a letter and check whether the letter is a vowel or consonant. Here is a sample run:
Enter a letter: B
B is a consonant
Enter a letter grade: a
a is a vowel
Enter a letter grade: #
# is an invalid input
Enter a letter: B
B is a consonant
Enter a letter grade: a
a is a vowel
Enter a letter grade: #
# is an invalid input
import java.util.Scanner; public class ProgrammingEx4_13 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter a letter: "); String s = input.nextLine(); // Check if the string has exactly one character if (s.length() != 1) { System.out.println("You must enter exactly one character"); System.exit(1); } // Check if input is valid char ch = Character.toUpperCase(s.charAt(0)); if (ch > 'Z' || ch < 'A') { System.out.println(s + " is an invalid input"); System.exit(1); } if (ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U') { System.out.println(s + " is a vowel"); System.exit(1); } System.out.println(s + " is a consonant"); } }
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