71 lines
1.5 KiB
Markdown
71 lines
1.5 KiB
Markdown
# Eliud's Eggs
|
|
|
|
Welcome to Eliud's Eggs on Exercism's Elixir Track.
|
|
If you need help running the tests or submitting your code, check out `HELP.md`.
|
|
|
|
## Introduction
|
|
|
|
Your friend Eliud inherited a farm from her grandma Tigist.
|
|
Her granny was an inventor and had a tendency to build things in an overly complicated manner.
|
|
The chicken coop has a digital display showing an encoded number representing the positions of all eggs that could be picked up.
|
|
|
|
Eliud is asking you to write a program that shows the actual number of eggs in the coop.
|
|
|
|
The position information encoding is calculated as follows:
|
|
|
|
1. Scan the potential egg-laying spots and mark down a `1` for an existing egg or a `0` for an empty spot.
|
|
2. Convert the number from binary to decimal.
|
|
3. Show the result on the display.
|
|
|
|
Example 1:
|
|
|
|
```text
|
|
Chicken Coop:
|
|
_ _ _ _ _ _ _
|
|
|E| |E|E| | |E|
|
|
|
|
Resulting Binary:
|
|
1 0 1 1 0 0 1
|
|
|
|
Decimal number on the display:
|
|
89
|
|
|
|
Actual eggs in the coop:
|
|
4
|
|
```
|
|
|
|
Example 2:
|
|
|
|
```text
|
|
Chicken Coop:
|
|
_ _ _ _ _ _ _ _
|
|
| | | |E| | | | |
|
|
|
|
Resulting Binary:
|
|
0 0 0 1 0 0 0 0
|
|
|
|
Decimal number on the display:
|
|
16
|
|
|
|
Actual eggs in the coop:
|
|
1
|
|
```
|
|
|
|
## Instructions
|
|
|
|
Your task is to count the number of 1 bits in the binary representation of a number.
|
|
|
|
## Restrictions
|
|
|
|
Keep your hands off that bit-count functionality provided by your standard library!
|
|
Solve this one yourself using other basic tools instead.
|
|
|
|
## Source
|
|
|
|
### Created by
|
|
|
|
- @kahgoh
|
|
|
|
### Based on
|
|
|
|
Christian Willner, Eric Willigers - https://forum.exercism.org/t/new-exercise-suggestion-pop-count/7632/5 |