18.16 (Find the number of uppercase letters in an array)
Write a recursive method to return the number of uppercase letters
in an array of characters. You need to define the following two methods.
The second one is a recursive helper method.
public static int count(char[] chars)
public static int count(char[] chars, int high)
Write a test program that prompts the user to enter a list
of characters in one line and displays the number of
uppercase letters in the list.
Write a recursive method to return the number of uppercase letters
in an array of characters. You need to define the following two methods.
The second one is a recursive helper method.
public static int count(char[] chars)
public static int count(char[] chars, int high)
Write a test program that prompts the user to enter a list
of characters in one line and displays the number of
uppercase letters in the list.
import java.util.Scanner; public class Exercise_16 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter a string: "); String s = input.nextLine(); System.out.println("The number of uppercase letters = " + count(s.toCharArray())); } public static int count(char[] chars) { return count(chars, chars.length - 1); } public static int count(char[] chars, int high) { int count = Character.isUpperCase(chars[high]) ? 1 : 0; if (high == 0) return count; else return count + count(chars, high - 1); } }
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