More Problems

• Write a program to implement a simple contact management system using file I/O.
• Write a program to check if a number is a friendly number.
• Write a program to find the smallest prime factor of a number using a function.
• Write a program to calculate the number of days between two dates.
• Write a program to check if a string contains any uppercase letters.
• Write a program to implement a simple online store application.
• Write a program to find the largest palindrome in a number.
• Write a program to check if a string is a valid date in the format DD-MM-YYYY.