Reverse polish notation calculator

Requirements

This program requires installed xxhash library. It must me avalible from pkg-config.

How does it translate to normal math?

2 5 + - 2 + 5

4 3 - 5 * - (4-3)*5

Supported two argument operators

• + addition
• - subtraction
• * multiplication
• \ division
• ^ exponentiation

Supported one argument functions

• sqrt square root
• abs absolute value
• sin
• cos

Supported constants

• PI PI number (3.14...)
• e Euler's number (2.71...) Each constant has 100 digits after .. This is more than enought to fully fill double C++ type(64-bit precision).

Functions

You are able to define your own one argument functions. To do it, write command def <name>. After that you will enter formula with x variable and from now you can call it like other one argument functions. They are much slower than build-in functions, but they are faster than expressions with no functions.

Support for polish notation

RPNParser also supports normal polish notation. To enable that pass --pn command line argument or exectue switch command. Parsing speed will not be affected, but there is some setup before calling parser, so it will take a little bit longer to execute it.