More Problems

• Write a program to check if a string is a valid email address using regex.
• Write a program to find the first unique character in a string using a hash map.
• Write a program to implement a simple text-based adventure game.
• Write a program to check if a number is a prime number using the Sieve of Eratosthenes.
• Write a program to find the sum of the digits of a hexadecimal number.
• Write a program to implement a basic file compression utility.
• Write a program to check if a string contains balanced parentheses using recursion.
• Write a program to find the first duplicate character in a string using a function.