Rewrite Programming Exercise 18.10 using a helper method to pass the substring high index to the method.
Question:
Rewrite Programming Exercise 18.10 using a helper method to pass the substring high index to the method. The helper method header is:
public static int count(String str, char a, int high)
Write a recursive method that finds the number of occurrences of a specified letter in a string using the following method header:
(public static int count(String str, char a)
For example, count("Welcome", 'e') returns 2. Write a test program that prompts the user to enter a string and a character, and displays the number of occurrences for the character in the string.
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Related Book For 
Introduction to Java Programming, Comprehensive Version
ISBN: 978-0133761313
10th Edition
Authors: Y. Daniel Liang
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