In an eye-glass shop, a customer can buy either a pair of single prescription glasses (or a pair of non- prescription sunglasses. On each pair of single prescription glasses, the customer is charged additional cost for coating on glasses. He must choose either an anti-glare coating (code-0) or a brown coating (code-1). Write a program that prompts the user to enter a letter for the type of glasses. The letter can be either 'n', 'N', 'p' or 'P'. If the type is 'p' or 'P', the user enters the coating code (0 or 1). The program calculates the total cost of eye glass according to the table below: Additional cost anti-glare coating (code-0) 12.5$ brown coating (code-1) 9.99$ Туре Cost 'P' or 'p' for Prescription glasses 40$ 'N' or 'n' for non-prescription sunglasses 25$ If the type or the code is invalid, the program should display an error message. Sample Run 1: Enter the type of glasses you like to buy: P Enter the coating code: 0 The total cost is $52.5 Using java Sample Run 2: Enter the type of glasses you like to buy: N The total cost is $25.0 omn

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.