Design application allows users to choose item from menu by using 1,2 or 3 that corresponds with item.
1.chicken Mayo sandwich R32.95
2.vinna and chips R 29.95
3.tuna tramezini R30.95
Prompt user to choose item from menus using 1,2 or 3; else user enters 0 to quit. If user choose 1,2 or 3 , show input box again and if user choose 0, show cost of item chosen. If user choose two items from menu before entering 0, add prices of two items and show to user.