Question Link : https://leetcode.com/problems/basic-calculator/

Difficulty: Hard

Premium: False

Question

Given a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of the evaluation. Note: You are not allowed to use any built-in function which evaluates strings as mathematical expressions …

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Question Link : https://leetcode.com/problems/basic-calculator-ii/n

Difficulty: Medium

Premium: False

Question

Given a string s which represents an expression, evaluate this expression and return its value.  The integer division should truncate toward zero. You may assume that the given expression is always valid. All intermediate results will be …

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Question Link : https://leetcode.com/problems/basic-calculator-iii/

Difficulty: Hard

Premium: True

Question

Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, '+', '-', '*', '/' operators, and open '(' and closing parentheses ')'. The integer division should truncate toward zero. You may assume that the given expression is …

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