problem0227

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Published: Jul 25, 2019 License: MIT Imports: 0 Imported by: 0

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227. Basic Calculator II

题目

Implement a basic calculator to evaluate a simple expression string.

The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division should truncate toward zero.

You may assume that the given expression is always valid.

Some examples:

"3+2*2" = 7
" 3/2 " = 1
" 3+5 / 2 " = 5

Note: Do not use the eval built-in library function.

解题思路

见程序注释

100

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