Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 18, Problem 18.10PE
(Occurrences of a specified character in a string) 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
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
1. Recursive Multiplication
Write a recursive function that accepts two arguments into the parameters x and y. The
function should return the value of x times y. Remember, multiplication can be performed
as repeated addition as follows:
7* 4 = 4 + 4 + 4 +4 + 4 + 4 + 4
Problem Description. Arguments for the main method are passed as strings. Strings enclosed in quotation marks are considered as one argument. Write a program to parse arguments from a string. Arguments are separated by spaces. Enclosed strings are considered as one argument. Your program should prompt the user to enter a string and display the arguments, each per line, as shown in the following sample run.
<input>
Enter the arguments: a friend "good morning" "good afternoon" b
<output>
a
friend
good morning
good afternoon
b
please provide the answer in JAVA
Data Structures
the hasBalancedParentheses () method. Note: this can be done both iteratively or recursively,
but I believe most people will find the iterative version much easier.
C++: We consider the empty string to have balanced parentheses, as there is no imbalance. Your
program should accept as input a single string containing only the characters ) and (, and output a
single line stating true or false. The functionality for reading and printing answers is written in the
file parentheses.checker.cpp; your task is to complete the has balanced.parentheses ()
function.
**Hint: There's a pattern for how to determine if parentheses are balanced. Try to see if you can find
that pattern first before coding this method up.
Chapter 18 Solutions
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Ch. 18.2 - What is a recursive method? What is an infinite...Ch. 18.2 - Prob. 18.2.2CPCh. 18.2 - Show the output of the following programs and...Ch. 18.2 - Prob. 18.2.4CPCh. 18.2 - Prob. 18.2.5CPCh. 18.2 - Write a recursive mathematical definition for...Ch. 18.3 - Prob. 18.3.1CPCh. 18.3 - What is wrong in the following methods?Ch. 18.3 - Prob. 18.3.3CPCh. 18.4 - Describe the characteristics of recursive methods.
Ch. 18.4 - Prob. 18.4.2CPCh. 18.4 - Prob. 18.4.3CPCh. 18.5 - Prob. 18.5.1CPCh. 18.5 - Prob. 18.5.2CPCh. 18.5 - What is a recursive helper method?Ch. 18.6 - Prob. 18.6.1CPCh. 18.6 - How does the program get all files and directories...Ch. 18.6 - How many times will the getSize method be invoked...Ch. 18.6 - Will the program work if the directory is empty...Ch. 18.6 - Will the program work if line 20 is replaced by...Ch. 18.6 - Will the program work if lines 20 and 21 are...Ch. 18.7 - Prob. 18.7.1CPCh. 18.8 - Prob. 18.8.1CPCh. 18.8 - Prob. 18.8.2CPCh. 18.8 - How many times is the displayTriangles method...Ch. 18.8 - Prob. 18.8.4CPCh. 18.8 - Prob. 18.8.5CPCh. 18.9 - Which of the following statements are true? a. Any...Ch. 18.9 - Prob. 18.9.2CPCh. 18.10 - Identify tail-recursive methods in this chapter.Ch. 18.10 - Rewrite the fib method in Listing 18.2 using tail...Ch. 18 - Prob. 18.1PECh. 18 - Prob. 18.2PECh. 18 - (Compute greatest common divisor using recursion)...Ch. 18 - (Sum series) Write a recursive method to compute...Ch. 18 - (Sum series) Write a recursive method to compute...Ch. 18 - (Sum series) Write a recursive method to compute...Ch. 18 - (Fibonacci series) Modify Listing 18.2,...Ch. 18 - Prob. 18.8PECh. 18 - (Print the characters in a string reversely) Write...Ch. 18 - (Occurrences of a specified character in a string)...Ch. 18 - Prob. 18.11PECh. 18 - (Print the characters in a string reversely)...Ch. 18 - (Find the largest number in an array) Write a...Ch. 18 - (Find the number of uppercase letters in a string)...Ch. 18 - Prob. 18.15PECh. 18 - (Find the number of uppercase letters in an array)...Ch. 18 - (Occurrences of a specified character in an array)...Ch. 18 - (Tower of Hanoi) Modify Listing 18.8,...Ch. 18 - Prob. 18.19PECh. 18 - (Display circles) Write a Java program that...Ch. 18 - (Decimal to binary) Write a recursive method that...Ch. 18 - (Decimal to hex) Write a recursive method that...Ch. 18 - (Binary to decimal) Write a recursive method that...Ch. 18 - (Hex to decimal) Write a recursive method that...Ch. 18 - Prob. 18.25PECh. 18 - (Create a maze) Write a program that will find a...Ch. 18 - (Koch snowflake fractal) The text presented the...Ch. 18 - (Nonrecursive directory size) Rewrite Listing...Ch. 18 - (Number of files in a directory) Write a program...Ch. 18 - (Game: Knights Tour) The Knights Tour is an...Ch. 18 - (Game: Knights Tour animation) Write a program for...Ch. 18 - (Game: Eight Queens) The Eight Queens problem is...Ch. 18 - Prob. 18.35PECh. 18 - (Sierpinski triangle) Write a program that lets...Ch. 18 - (Hilbert curve) The Hilbert curve, first described...Ch. 18 - (Recursive tree) Write a program to display a...Ch. 18 - Prob. 18.39PE
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Test Average Write a program that asks the user to enter three test scores. The program should display each tes...
Starting Out with Java: From Control Structures through Objects (6th Edition)
Type in and run the program presented in this chapter. Check the programs results by comparing the original fil...
Programming in C
Class B extends class A. (Class A is the superclass and class B is the subclass.) Describe the order in which t...
Starting Out with Java: From Control Structures through Data Structures (3rd Edition)
The refers to the base class. a. friend keyword b. this keyword c. base keyword d. class keyword
Starting out with Visual C# (4th Edition)
This is an operator that raises a number to a power. a. % b. c. d. /
Starting Out with Python (4th Edition)
What does the phrase garbage in, garbage out mean?
Starting Out with Programming Logic and Design (5th Edition) (What's New in Computer Science)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- 1) Simple Calculator: In Python, implement a simple calculator that does the following operations: summation, subtraction, multiplication, division, sqrt, power, natural log and abs. a) Follow the instructions below: To work with the calculator, the user is asked to enter the first number, then the operation, and finally, a second number if required. Your code has to recognize the need for the second number and ask for it if required. After performing one operation, the calculator prints the output of the operation. After performing one operation, the calculator must not exit. It has to start again for the next operation. The calculator will be closed if the user writes 'e' as any input. Use functions to perform the operations and the appropriate conditions to prevent common errors such as entering characters as one of the numbers etc. b) Run your code and provide the results for at least one example per operation. - -arrow_forward?(ls empty string e L(G Yes Noarrow_forwardRecursive Power MethodWrite a method called powCal that uses recursion to raise a number to a power. The method should accept two arguments: The first argument is the exponent and the second argument is the number to be raised (example” powCal(10,2) means 210). Assume that the exponent is a nonnegative integer. Demonstrate the method in a program called Recursive (This means that you need to write a program that has at least two methods: main and powCal. The powCal method is where you implement the requirements above and the main method is where you make a method call to demonstrate how your powCal method work).arrow_forward
- 5- Write a C program that reads a number and check whether its' prime or not. Note: a prime number is the number that can only be divisible by 1 and it's self. Examples: 2, 3, 5, 7, 11, 13... etc.arrow_forwardPython Language Useful websites: : http://en.wikipedia.org/wiki/Radix http://www.purplemath.com/modules/numbbase.htm Special Rules: Use only Boolean/math expressions and conditional statements (if-statements). Do not use built-in functions for converting integers into a string representation. Here to start with: kthDigit(x: int, b: int, k: int) -> int .........arrow_forwardProblem Description: In the Whimsical Library, each book is enchanted with a magical code to ensure the protection of knowledge. The validation process for these magical codes involves a combination of mathematical spells. The validation process is described as follows: Take the sum of the digits at odd positions from left to right. Take the sum of the squared digits at even positions from left to right. If the absolute difference between the results from step 1 and step 2 is a prime number, the book code is considered valid; otherwise, it is invalid. Example 1: Consider the magical book code 86420137. Step 1. Take the sum of the digits at odd positions from left to right. 8+4+0+3=15 Step 2. Take the sum of the squared digits at even positions from left to right. 6^2+2^2+1^2+7^2=36+4+1+49 = 90 Step 3. If the absolute difference between the results from step 1 and step 2 is a prime number. 115-901 = 75 (not a prime number) Book code 86420137 is invalid. Example 2: Now, let's examine the…arrow_forward
- C. Programming language: Python Share code and screenshot Write a python Program that will include the following: • It will read from the user (with the Input method) a string. The user will be able to enter whatever text he wants. • You should then read the string character by character and do the following If the character is any Latin character (lowercase or uppercase A-Z, a-z) you will print "READING ALPHABETIC CHARACTER *", where * is the character you read If the character is a number you will print "READING DIGIT *", where * is the digit read If the character is any other punctuation mark (or the space), you will print "READING SIMPLE CHARACTER *", where * is the character read • For prints please use f-stringarrow_forwardpython nMath: pentagonal numbers) A pentagonal number is defined as n(3n-1)/2 for n=1,2,..., and so on. So, the first few numbers are 1, 5, 12, 22, .... Write a function with the following header that returns a pentagonal number: def getPentagonalNumber(n): Write a test program that uses this function to display the first 100 pentagonal numbers with 10 numbers on each line.arrow_forwardCodeWorkout Gym Course Search exercises... Q Search kola shreya@columbus X275: Recursion Programming Exercise: Check Palindrome X275: Recursion Programming Exercise: Check Palindrome Write a recursive function named checkPalindrome that takes a string as input, and returns true if the string is a palindrome and false if it is not a palindrome. A string is a palindrome if it reads the same forwards or backwards. Recall that str.charAt(a) will return the character at position a in str. str.substring(a) will return the substring of str from position a to the end of str,while str.substring(a, b) will return the substring of str starting at position a and continuing to (but not including) the character at position b. Examples: checkPalindrome ("madam") -> true Your Answer: 1 public boolean checkPalindrome (String s) { 4 CodeWorkout © Virginia Tech About License Privacy Contactarrow_forward
- Q1:Write C code for a program that reads two positive integer number, checks whether these number are co-prime or not, and prints the result.Note: two numbers are co-prime numbers if they do not have a common factor other than 1. For example, 10 and 11 are co-prime.arrow_forward24) If the method is called as patternRecognizer(x) where x is “aa”, what will the result be?a) trueb) falsec) a NullPointerException d) a run-time errore) infinite recursionarrow_forwardWrite the countVowels function which counts the number of vowels using the string class as follows: int countVowels(const string& s) Write a test program that prompts the user to enter a string, invokes the countVowels function and displays the total number of vowels in the string.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781337671385
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
Program to find HCF & LCM of two numbers in C | #6 Coding Bytes; Author: FACE Prep;https://www.youtube.com/watch?v=mZA3cdalYN4;License: Standard YouTube License, CC-BY