Problem Set

Implement the method calculateCircleArea that takes the radius of a circle as a float and returns its area.

Implement the method isAnagram that takes two strings and returns true if they are anagrams of each other, otherwise returns false.

Implement the method countOccurrences that takes a string and a character as input and returns the number of times that character appears in the string.

Implement the method removeVowels that takes a string as input and returns the string after removing all vowels from it.

Implement the method sumDigits that takes an integer as input and returns the sum of its digits.

Implement the method isEven that takes an integer as input and returns true if the number is even, and false if it is odd.

Implement the method factorial that takes a non-negative integer as input and returns its factorial.

Implement the method findMax that takes an array of integers and returns the largest (maximum) value in the array.

Implement the method countVowels that returns the number of vowels present in a given string.

Implement the method sumArray that calculates and returns the sum of all integers in an input array.

Write a function named isPalindrome that determines whether a given string is a palindrome.

Implement the reverseString method, which accepts a string and returns its reverse.