Solution: Basic Calculator
Explore how to build a basic calculator that evaluates arithmetic expressions containing integers, plus and minus operators, and nested parentheses. Learn to use stack operations to manage intermediate results and handle nested subexpressions during evaluation. Understand the step-by-step algorithm and its time and space efficiency.
Statement
Given a string containing an arithmetic expression, implement a basic calculator that evaluates the expression string. The expression string can contain integer numeric values and should be able to handle the “+” and “-” operators, as well as “()” parentheses.
Constraints:
Let s be the expression string. We can assume the following constraints:
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s.length