Solution: Basic Calculator
Understand how to evaluate arithmetic expressions containing integers, addition, subtraction, and nested parentheses by applying stack operations. Learn to process the expression in a single pass, managing intermediate results and signs with a stack. This lesson helps you solve complex nested calculations using fundamental stack methods and improve your problem-solving skills for coding interviews.
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:
-
s.length