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使用栈实现算术表达式求值

• 为了更好地理解Foundation，所以没有用NSExpression，而是自己实现一个栈来完成表达式求值。这就是基本运算所依赖的核心算法。

实现的功能

• 项目实现了带有括号计算器的四则运算，并有删除和清空功能。

项目核心代码

• Medel文件夹存放了栈实现数值表达式算法的文件:Stack.h Stack.m Calculate.h Calculate.m 。
• Stack.h和Stack.m是自定义的栈结构文件，Calculate.h定义了一些四则运算需要的成员变量和操作的方法，而Calculate.m则是具体实现了四则运算操作的方法。整个业务逻辑的代码位于ViewController.m的文件中。

算法参考

• 对四则运算算法表示困惑的同学，可以参考下严蔚敏老师的数据结构教材。

运行效果

联系方式

Email: [email protected]

Implement

• We use a customized stack to implement an arithmetic expression evaluation instead of using NSExpression for better understanding Foundation. This is the core algorithm that basic operations depend on.

Function

• The project implements basic four arithmetic operations with parenthesis which has function of deleting and clearing.

Code file structure

• The Medel folder stores the file which implements algorithm of arithmetic expression.
• Stack.h and Stack.m are customized stack struture file .Calculate.h defines a number of member variables and operations for basic arithmetic operations and Calculate.m implements these methods.

Algorithm reference books

• If are puzzled about this algorithm, you can refer to Data Structure by Weimin Yan.

Running effect

Contact

Email: [email protected]