Question 5

Design and implement a calculator that can calculate expressions like:
+ 2 4
* 8 ( + 7 12)
( + 7 ( * 8 12 ) ( * 2 (+ 9 4) 7 ) 3 )
(PS:all items are space delimetered.)
Example answers
+ 2 4 => 2 + 4 = 6
* 8 ( + 7 12) => 8 * ( 7 + 12 ) = 152
( + 7 ( * 8 12 ) ( * 2 (+ 9 4) 7 ) 3 ) => 7+8*12+2*(9+4)*7+3 = 148

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