In this assignment you will be working with loops. You will be implementing the following methods using loops.
Requirements:
- Every method you created should be tested in the class’s main method. You can copy the tests you wrote for these methods from your previous assignments.
- Every java file should have a header. However, DO NOT PUT YOUR NAME IN YOUR HEADERS. On gradescope we grade your assignments anonymously so including your name in your Java file will defeat that purpose. However, please include your name in your README.txt
- Dont forget to add
public staticto every method signature. If a method does not have these, the autograder will fail and you wont receive any points for that method.
Note, in the examples,
*indicates user input.
WARNING: In this assignment you are NOT ALLOWED to import any packages. For example, you cannot use the builtin
Arraysjava class to reverse an array. Doing so will result in earning ZERO POINTS for a method that uses it.
IF YOUR CODE DOES NOT COMPILE ON GRADESCOPE, YOU WILL NOT RECEIVE ANY POINTS FROM THE AUTOGRADER. When you submit, make sure to check if the autograder compiles and if you test some of the public test cases.
Write a program called NumbersLoops.java that implements the following methods. Make sure to test the methods in the file’s main method.
Write a method called previousEven that takes in an integer and prints out all the previous even numbers. Implement this method using a for loop.
For example, previousEven(6) should print out 6 4 2, previousEven(9) should print out 8 6 4 2 . Make sure to put a space between the numbers and print all the numbers on one line.
It is ok if there is a space after the 2.
Write a method called previousOdd that takes in an integer and prints out all the previous odd numbers.
Implement this method using a while loop.
For example, previousOdd(6) should print out 5 3 1, previousOdd(9) should print out 9 7 5 3 1. Make sure to put a space between the numbers and print all the numbers on one line.
It is ok if there is a space after the 2.
Write a program called WordsLoops.java that implements the following methods. Make sure to test the methods in the file’s main method.
Hint: You will want to use some of the
Stringmethods covered in Lab02 and Lab03.
Write a method called removeLetter that takes in a String and a letter and returns the String but will all instances of that letter removed. Implement this method using a for loop.
For example, removeLetter("asdfghsassaaaae", 'a') should return sdfghssse.
Note: you are not allowed to use the replace method.
Write a method called removeLetters that takes in a String and an array of letters and returns the String but will all instances of the letters removed. Implement this method using a while loop.
For example, removeLetters("asdfghsassaaaae", ['a','s']) should return dfghe.
Your method can call removeLetter from 2.1
Write a method called generateRandWord that takes in an integer and returns a word of that length of random letters from a-z.
Each character should be chosen at random.
You can choose to use either a while loop or a for loop
In a file called ArraysLoops.java, write the following methods.
A palindrome is a word (or an ordered collection) that is the same backwords. For example, madam and "a man, a plan, a canal – Panama are both palindromes.
Write a method called isPalindrome that takes in an array of characters and returns true if the array is a palindrome. If the array is empty, the method should return true since that technically is a palindrome.
Write a method called locationOf that takes in an array of integers, a specific integer, and returns the last index of where that integer appears in the array. If the integer is not in the array, return -1.
You can choose to use a for loop or a while loop.
For example locationOf({2,4,5,1,5}, 5) would return 4 and locationOf({2,4,5,1,5}, 9) would return -1.
In a text file called README.txt answer the following questions:
Dont forget: make sure to fill in the header in all of your java files.
Submit the following files to the assignment called HW07 on Gradescope:
NumbersLoopsjavaWordsLoops.javaArraysLoops.javaREADME.txtMake sure to name these files exactly what we specify here and name the methods exactly what we specify too. Otherwise, our autograders might not work and we might have to take points off.