Add Ex 18.14

Author: jsquared21

Exercise_18/Exercise_18_14/Exercise_18_14.class

@@ -0,0 +1,40 @@
+/*********************************************************************************
+* (Find the number of uppercase letters in a string) Write a recursive method to *
+* return the number of uppercase letters in a string. Write a test program that  *
+* prompts the user to enter a string and displays the number of uppercase        *
+* letters in the string.                                                         *
+*********************************************************************************/
+import java.util.Scanner;
+
+public class Exercise_18_14 {
+	/** Main method */
+	public static void main(String[] args) {
+		// Create a Scanner
+		Scanner input = new Scanner(System.in);
+	
+		// Prompt the user to enter a string
+		System.out.print("Enter a string: ");
+		String str = input.nextLine();
+
+		// Display the number of uppercase letters in the string
+		System.out.println("There are " + countUppercase(str) 
+			+ " uppercase letters in \"" + str + "\".");
+	}
+
+	/** Method counts the uppercase letters in a string */
+	public static int countUppercase(String str) {
+		int count = 0;
+		int index = str.length() - 1;
+		return countUppercase(str, index, count);
+	}
+
+	/** Helper method */
+	private static int countUppercase(String str, int index, int count) {
+		if (index < 0) // Base case
+			return count;
+		else if (Character.isUpperCase(str.charAt(index))) 
+			return countUppercase(str, index - 1, count + 1); // Recursive call
+		else
+			return countUppercase(str, index - 1, count); // Recursive call
+	}
+}