表达式计算 [英] EXPRESSION CALCULATION

问题描述

如何计算c＃中的表达式

HOW TO CALCULATE EXPRESSION IN c#

如51 + 25/28 + 1-（85 * 87）+ 54 + 36 * 98-45

LIKE 51+25/28+1-(85*87)+54+36*98-45

推荐答案

家庭作业问题？

Homework questions?

基于表达式的计算器是中学学习"字符串标记化"的流行作业。和"堆叠操纵"/"树横向"和"树横向操作"。技术。

Expression based calculator is a popular homework for secondary school to practice "string tokenizing" and "stack manipulation"/"tree transversal" technique.

编辑：添加"树横向"因为我已经看到了基于这两种方法的解决方案。

added "tree transversal" because I've seen solutions based on both approach.

提示：在标记字符串的过程中，如果你跟踪运算符优先级和在优先级变化上添加缺少的括号，可以大大简化计算器逻辑。

Tips: On the process of tokenizing the string, if you keep track of the operator precedence level and add missing parenthesis on precedence level change, the calculator logic can be significantly simplified.

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