Solution: Basic Calculator
Explore how to use the stack pattern to evaluate arithmetic expressions containing integers, plus and minus operators, and parentheses. Learn step-by-step how to handle nested subexpressions by pushing and popping intermediate results. This lesson helps you implement a basic calculator with a clear approach to managing operator precedence and nested expressions.
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