More Problems

• Write a program to check if a number is a Kaprekar number.
• Write a program to find the longest substring without repeating characters.
• Write a program to implement a simple event planner application.
• Write a program to find the first character that is not repeated in a string.
• Write a program to check if a given string is a valid binary number.
• Write a program to find the sum of all multiples of 3 or 5 below a given number.
• Write a program to implement a basic calculator that can handle decimals.
• Write a program to check if a string has all the letters of the alphabet (pangram).