Problem
1. Write a program that prompts for an integer not exceeding 255, and then prints A if the number is below 127, B if it is below 224, and C otherwise.
2. Write a program that prompts a user repeatedly to enter a number. When the user enters 0, the program should print the total.
3. Write a program that takes a filename and string as arguments and prints from the file only the first line containing the string.