Solution: Basic Calculator
Explore how to implement a basic calculator that evaluates arithmetic expressions containing integers, plus and minus operators, and nested parentheses. Learn to use the stack pattern to handle intermediate calculations and manage nested subexpressions. This lesson guides you step-by-step through parsing the string expression, managing operands, and applying stack operations to evaluate the result efficiently with linear time complexity.
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