# Engineering Calculator¶

This calculator is noteworthy in that it employs a stack model of computation (Reverse Polish Notation), it supports numbers with SI scale factors and units, and uses a text-only user interface.

## Installing¶

Install with:

```
pip3 install engineering-calculator --user
```

Requires Python version 3.6 or later.

## Features¶

Text-based interactive interface.

Stack-based calculation model

Full scientific/engineering calculator.

Support SI scale factors and units on inputs and outputs.

Supports hexadecimal, octal, and binary formats in both programmers and Verilog notation.

Provides special functionality for electrical engineers.

## Examples¶

Invoke engineering calculator and compute the value of a resistor by dividing the voltage difference across the resistor by the current through it:

```
> ec
0: 2.5V 250mV - 1mA /
2.25k:
```

Here a hexadecimal number is converted to and from decimal:

```
> ec
0: 'hFF
255: vhex
'h00ff:
```

In this example, a frequency is converted to radians and saved into the variable
*omega*, which is then used to compute the impedance of an inductor and
capacitor:

```
> ec
0: 1MHz 2pi * =omega
6.2832M: 100nH *
628.32m: 1 10nF omega * /
15.915:
```