Solution: Basic Calculator II
Understand how to implement a basic calculator that evaluates expressions containing addition, subtraction, multiplication, and division using a stack-based approach. Learn to respect operator precedence by deferring addition and subtraction and immediately resolving multiplication and division. This lesson helps you process and compute valid mathematical strings efficiently without using built-in evaluation functions, emphasizing stack operations and integer truncation.
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Statement
Given a string s representing a mathematical expression containing non-negative integers and the operators +, -, *, and /, evaluate the expression and return its result.
Integer division must truncate toward zero. You may assume the expression is always valid, and all intermediate results fall within the
Note: Using any ...