Solution: Evaluate Postfix Expression Using a Stack
Understand how to evaluate arithmetic expressions written in postfix notation using a stack in JavaScript. Learn to handle digits and operators systematically by pushing operands onto the stack, then applying operators on popped elements to compute the final result efficiently.
We'll cover the following...
Statement
Given a string, exp, represents an arithmetic expression in a
exp and return the resulting integer value.
The rules are given below:
The valid operators are
'+','-','*', and'/'.Each operand may be an integer or another expression.
The division between two integers always truncates toward zero.
There will not be any division by zero.
The input represents a valid arithmetic expression in a postfix notation.
The answer and all the intermediate calculations can be represented in a 32-bit integer.
Each digit is considered to be a separate number, i.e., there are no double digit numbers.
Constraints:
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