More Problems

• Write a program to find the sum of all prime numbers up to n.
• Write a program to implement a simple number guessing game with feedback.
• Write a program to check if a string is a valid email address (basic validation).
• Write a program to find the minimum element in a 2D array.
• Write a program to implement a simple text-based calendar.
• Write a program to find the index of the first occurrence of a character in a string.
• Write a program to check if a number is a perfect number.
• Write a program to print all combinations of two digits.