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Example code of hyperf/rpn

Informations about the package rpn

RPN - 逆波兰表示法

RPN 是一种是由波兰数学家扬·武卡谢维奇1920年引入的数学表达式方式，在逆波兰记法中，所有操作符置于操作数的后面，因此也被称为后缀表示法。逆波兰记法不需要括号来标识操作符的优先级。

RPN 逻辑

基本逻辑

实例

中缀表达式 5 + ((1 + 2) * 4) - 3 写作

5 1 2 + 4 * + 3 -

下表给出了该逆波兰表达式从左至右求值的过程，堆栈栏给出了中间值，用于跟踪算法。

输入 操作 堆栈 注释
5 入栈 5
1 入栈 5, 1
2 入栈 5, 1, 2
+ 加法运算 5, 3 1, 2出栈，将结果 3 入栈
4 入栈 5, 3, 4
* 乘法运算 5, 12 3, 4 出栈，将结果 12 入栈
+ 加法运算 17 5, 12 出栈，将结果 17 入栈
3 入栈 17, 3
- 减法运算 14 17, 3 出栈，将结果 14 入栈

计算完成时，栈内只有一个操作数，这就是表达式的结果：14

使用

直接计算 RPN 表达式

设置计算精度

设置变量

中缀表达式转化为后缀表达式

暂时不支持使用变量

All versions of rpn with dependencies

PHP Build Version
Package Version
Requires php Version >=8.1
ext-bcmath Version *
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