{ "data": { "question": { "questionId": "227", "questionFrontendId": "227", "categoryTitle": "Algorithms", "boundTopicId": 1786, "title": "Basic Calculator II", "titleSlug": "basic-calculator-ii", "content": "

Given a string s which represents an expression, evaluate this expression and return its value. 

\n\n

The integer division should truncate toward zero.

\n\n

You may assume that the given expression is always valid. All intermediate results will be in the range of [-231, 231 - 1].

\n\n

Note: You are not allowed to use any built-in function which evaluates strings as mathematical expressions, such as eval().

\n\n

 

\n

Example 1:

\n
Input: s = \"3+2*2\"\nOutput: 7\n

Example 2:

\n
Input: s = \" 3/2 \"\nOutput: 1\n

Example 3:

\n
Input: s = \" 3+5 / 2 \"\nOutput: 5\n
\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "基本计算器 II", "translatedContent": "

给你一个字符串表达式 s ，请你实现一个基本计算器来计算并返回它的值。

\n\n

整数除法仅保留整数部分。

\n\n

你可以假设给定的表达式总是有效的。所有中间结果将在 [-231, 231 - 1] 的范围内。

\n\n

注意：不允许使用任何将字符串作为数学表达式计算的内置函数，比如 eval() 。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：s = \"3+2*2\"\n输出：7\n
\n\n

示例 2：

\n\n
\n输入：s = \" 3/2 \"\n输出：1\n
\n\n

示例 3：

\n\n
\n输入：s = \" 3+5 / 2 \"\n输出：5\n
\n\n

 

\n\n

提示：

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