# Session 4: 7segment, useful application

## Review

From previous sessions we have learned to:

* Show a number on a 7segment
* Work with multiple 7segments

## Assignment

For this session we are going show some trading data on 8 7segments.
To do so, we need to take the following steps:

* Connect 8 7segments to the microcontroller. (in simulation.)
* At first, 4 7segments should show the name of the cryptocurrency.
  * For example, we can show `BTC` for Bitcoin.
* second, 4 7segments should show the price of the cryptocurrency.
  * We want to show the price with 2 decimal points.
  * For example, for the price, we can show: `84.32`.
* Data are in 2 arrays:
  * names: contains the names of the cryptocurrencies
  * values: contains the prices of the cryptocurrencies

## Valid charachters

For all of us to be in the same page for the character presentation,
we all use the presentation provided by [this link](https://en.wikipedia.org/wiki/Seven-segment_display_character_representations#Alphabet)

## Example

Data arrays:

```cpp
String names[4] = {"BTC", "ETH", "DOGE", "ADA"};
float values[4] = {79.12, 19.02, 0.17, 0.73};
```

Expected Output:

![s4_goal](figures/s4_goal.gif)