Power Calculator

Power calculator or pcalc is a powerful, feature-heavy console calculator.

Features

Version 2.1.0 of pcalc supports the following features:

• Basic arithmetic alongside exponentiation, float mod, and float factorial
• User-defined variables
• Units - meter, foot, kilogram, pound, second, celsius, fahrenheit, and more

Future releases will implement the following additional features:

• Predefined constants
• Functions

Installation

pcalc is built using bazel: https://bazel.build/.

Ensure that bazel is installed alongside a C++ build compiler. Run the following command to build pcalc:

bazel build //main:pcalc

bazel will install the required dependencies and output a binary as bazel-bin/main/pcalc.

You can copy it to another location as per your convenience.

Usage

If you run pcalc, you should be greeted with the following prompt:

Welcome to Power Calculator!
> _

You can begin typing arithmetic expressions. Pressing Enter will display the result or an error. Here are some examples:

Welcome to Power Calculator!
> 5 * (1 + 4) / 8
= 3.125
> 2 ^ 10 
= 1024
> 625 ^ 0.5
= 25
> 64 ^ (1 / 3)
= 4
> 16 % 7
= 2
> 4.1 % 0.6
= 0.5
> 3!
= 6
> 4.2!
= 32.5781
> let x = 42
= 42
> x * x
= 1764
> x = 5
= 5
> x ^ 5
= 3125
> 1 meter + 2 foot
= 5.28084 foot
> 42 meter / 1 second + 0 kilometer / 1 hour
= 151.2 kilometer / hour

A few things to note:

• You can take square root and cube root of a number using exponentiation.
• a % b gives the remainder when b is divided by a. a and b can be real numbers.
• You can create variables, and reassign to them.
• Variable assignment can be part of an expression: (x = 5) * 3 gives 15.
• When units are involved, the output uses the units of the last operand.
• Units lose their meaning in the context of exponentiation and factorial.

Supported Units

The following units are supported:

Length

• meter
• kilometer
• inch
• foot
• mile
• league

Mass

• kilogram
• gram
• tonne
• pound

Time

• second
• minute
• hour
• day
• week
• fortnight
• year

Temperature

• kelvin
• celsius
• fahrenheit

Information

• bit
• byte
• kilobyte
• megabyte
• gigabyte
• terabyte