rust-percentage-change-calculator

Percentage change calculator written in rust

What is percentage change?

A percentage change is a way to express a change in a variable. It represents the relative change between the old value and the new one.

For example, if a house is worth $100,000 today and the year after its value goes up to $110,000, the percentage change of its value can be expressed as

It can then be said that the worth of the house went up by 10%.

How do you calculate the percentage change?

In simple terms, there are three calculations that we carry out, here's an example:

• The first number minus the second number
• The sum of the previous calculation divided by the first number
• The sum of the previous calculation multipled by 100
• The answer is the percentage changed

50 - 10 = 40
40 / 50 = 0.8
0.8 * 100 = -8%

OR

100 - 200 = 100
100 / 200 = 0.5
0.5 * 100 = +50%

Docker Usage

• docker pull thomaschaplin/rust-percentage-change-calculator
• docker run --rm thomaschaplin/rust-percentage-change-calculator <NUMBER> <NUMBER>

Development Setup

Make sure you have rust installed on your machine by following the getting started guide

Instructions

• Clone this repository git clone git@github.com:thomaschaplin/rust-percentage-change-calculator.git
• Change directory cd rust-percentage-change-calculator
• Build the application cargo build
• Run the application cargo run <NUMBER> <NUMBER>

Final Build

• Build the application in release mode cargo build --release
• Execute the rust-percentage-change-calculator binary file found in target/release/rust-percentage-change-calculator

Example Usage:

./rust-percentage-change-calculator 100 200

+100%

./rust-percentage-change-calculator 200 100

-50%

./rust-percentage-change-calculator 100 100

0%

Local Docker Setup

Build

docker build --rm -f Dockerfile -t thomaschaplin/rust-percentage-change-calculator .

Run

docker run --rm thomaschaplin/rust-percentage-change-calculator <NUMBER> <NUMBER>

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Percentage graphic by Mario Rui from ClipArtKey.