Part-1

Prepare a program that teaches arithmetic to a young child. The program tests subtraction and addition. In Level 1 it tests only addition of numbers less than 10 whose sum is less than 10. In level 2 it tests addition of arbitrary one-digit numbers. In level 3 it tests subtraction of one-digit numbers with a non-negative difference. Generate random problems and get the player input. The player gets up to two tries per problem. Advance from one level to the next when the player has achieved a score of five points.

Part-2

Write a program that assigns seats on an airplane. Suppose the airplane has 20 seats in first class (5 rows of 4 seats each, separated by an aisle) and 90 seats in economy class (15 rows of 6 seats each, separated by an aisle). Your program could take three commands: add passengers, show seating, and quit. When passengers are added, ask for the class (first or economy) the number of passengers traveling together (1 or 2 in first class; 1 to 3 in economy), and the seating preference (window or aisle in first class; aisle, center, or window in economy). Then try to evaluate a match and assign the seats. If no match exists, print a message. Your solution should include a class Airplane that is not coupled with the Scanner or Print Stream classes.