Module 4: String Programs

Reverse a given string using a loop.

Check whether a string is a palindrome.

Count the number of vowels in a string.

Count the number of consonants in a string.

Count the number of words in a sentence.

Remove all whitespace characters from a string.

Remove duplicate characters from a string, keeping first occurrences.

Check whether two strings are anagrams of each other.

Check if one string is rotation of another.

Count frequency of each character in a string.

Find the longest word in a sentence.

Find the shortest word in a sentence.

Replace all occurrences of a substring in a string.

Reverse the order of words in a sentence.

Sort characters of a string in ascending order.

Convert a sentence to title case (first letter of each word uppercase).

Count number of uppercase letters in a string.

Count number of lowercase letters in a string.

Extract all numbers (digits) from a string.

Validate email format using a simple regex.

Check if a password meets basic strength rules using regex.

Check whether a sentence is a pangram (contains all letters A–Z).

Split a sentence into words and then join them with a different delimiter.

Compress a string as character followed by count (basic run-length encoding).

Generate all permutations of a string using recursion.