More Problems

• Write a program to check if a number is an abundant number using a function.
• Write a program to implement a basic character frequency analyzer.
• Write a program to find the first character that appears more than once in a string.
• Write a program to check if a string is a valid credit card number using the Luhn algorithm.
• Write a program to calculate the average of a list of numbers using pointers.
• Write a program to implement a simple to-do list application with task prioritization.
• Write a program to find the total number of lines in a text file.
• Write a program to check if a number is a happy number using the tortoise and hare algorithm.