More Problems

• Write a program to find the longest substring of unique characters in a string.
• Write a program to check if two strings are anagrams of each other using sorting.
• Write a program to calculate the total cost of items in a shopping cart including tax.
• Write a program to implement a simple online shopping application with user login.
• Write a program to check if a string is a valid floating-point number.
• Write a program to find the first unique word in a string using a function.
• Write a program to implement a basic budget calculator with income and expenses.
• Write a program to check if a number is a prime number using a sieve algorithm.