Parenthesis are never needed in prefix or postfix
expressions. Why?
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Answer Posted / arnoldindia
Evaluation of postfix or prefix notations are done with the
help of stacks. So there is no need for brackets.
In other words, infix notation is human-readable format,
which need brackets based on BODMAS rule to understand the
order of execution. The postfix or prefix are
machine-readable format. The conversion and evaluation of
postfix and prefix are applications of stack model.
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