More Problems

• Write a program to calculate the sum of digits of a number using a loop.
• Write a program to check if a string is a valid integer.
• Write a program to find the number of vowels in a string using a function.
• Write a program to convert a hexadecimal number to decimal.
• Write a program to implement a simple text file editor.
• Write a program to check if a given number is a power of three.
• Write a program to find the total number of letters in a sentence.
• Write a program to implement a simple e-commerce application.