More Problems

• Write a program to check if a string has balanced parentheses using a function.
• Write a program to implement a simple game of Connect Four.
• Write a program to find the first duplicate character in a string.
• Write a program to convert a hexadecimal number to decimal using a function.
• Write a program to check if two numbers are coprime using the GCD method.
• Write a program to implement a basic shopping list application.
• Write a program to find the total number of uppercase letters in a string using a function.
• Write a program to check if a string is a valid date in the format YYYY-MM-DD.