1. In order to write an RPN calculator one needs to declare
A. a single stack capable of holding the numers
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B. a stack for the numbers and a stack for the operators
C. only a stack for the operators since the numbers are immediately output
D. a stack for operators, a stack for numbers and a stack to hold the results of these operations.
RPN means Reverse polish notation, in order to write a RPN calculator one needs to declare:
the answer is A i.e. a single stack of numbers for example
to evaluate expression 5 6 + thefollowing steps will be performed:
- push 5 on the stack
- push 6 on the stack
- pop the two topmost stack values and apply + operator and the push the result(11) on the top of the stack