Solution: Basic Calculator
Explore how to build a basic calculator that evaluates arithmetic expressions containing integers, plus and minus operators, and parentheses. Learn to use stack methods like push and pop to handle nested subexpressions efficiently. This lesson guides you through constructing and understanding the solution step-by-step.
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