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A canteen sells snacks from a fixed menu and cakes made to order. Write interface Priced { int price(); String label(); }. enum Snack implements Priced has SAMOSA(15), VADA_PAV(20), CHAI(10) and POHA(25); its label is its name. class Cake implements Priced has a flavour and a weight in kg; it costs Rs. 600 per kg and its label is <flavour> cake <kg> kg.
Add every bill line through one method that takes a Priced and a quantity.
SNACK_NAME qty (any case) or CAKE flavour kg.label x qty = Rs. amount (a cake always has qty 1), or Unknown item WORD for a word that is neither a snack nor CAKE. Last line: Total: Rs. total.Example
Input
4 samosa 3 CAKE Chocolate 2 chai 2 pizza 1
Output
SAMOSA x 3 = Rs. 45 Chocolate cake 2 kg x 1 = Rs. 1200 CHAI x 2 = Rs. 20 Unknown item pizza Total: Rs. 1265
Pizza is not on the menu; its quantity is still read and ignored.
Try the problem first. Open one hint at a time.
Read the first word; if it equals CAKE (ignoring case), read a flavour and a weight, otherwise try Snack.valueOf(word.toUpperCase()) and read the quantity.
A method static int addLine(Priced item, int qty) can print the line and return the amount for both kinds.
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