Contents

# Binary

Convert a binary number, represented as a string (e.g. '101010'), to its decimal equivalent using first principles.

Implement binary to decimal conversion. Given a binary input
string, your program should produce a decimal output. The
program should handle invalid inputs.

## Note
- Implement the conversion yourself.
  Do not use something else to perform the conversion for you.

## About Binary (Base-2)
Decimal is a base-10 system.

A number 23 in base 10 notation can be understood
as a linear combination of powers of 10:

- The rightmost digit gets multiplied by 10^0 = 1
- The next number gets multiplied by 10^1 = 10
- ...
- The *n*th number gets multiplied by 10^*(n-1)*.
- All these values are summed.

So: `23 => 2*10^1 + 3*10^0 => 2*10 + 3*1 = 23 base 10`

Binary is similar, but uses powers of 2 rather than powers of 10.

So: `101 => 1*2^2 + 0*2^1 + 1*2^0 => 1*4 + 0*2 + 1*1 => 4 + 1 => 5 base 10`.

## Running tests

Execute the tests with:

```bash
$ elixir bob_test.exs
```

(Replace `bob_test.exs` with the name of the test file.)

### Pending tests

In the test suites, all but the first test have been skipped.

Once you get a test passing, you can unskip the next one by
commenting out the relevant `@tag :pending` with a `#` symbol.

For example:

```elixir
# @tag :pending
test "shouting" do
  assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
end
```

Or, you can enable all the tests by commenting out the
`ExUnit.configure` line in the test suite.

```elixir
# ExUnit.configure exclude: :pending, trace: true
```

For more detailed information about the Elixir track, please
see the [help page](http://exercism.io/languages/elixir).

## Source

All of Computer Science [http://www.wolframalpha.com/input/?i=binary&a=*C.binary-_*MathWorld-](http://www.wolframalpha.com/input/?i=binary&a=*C.binary-_*MathWorld-)

## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.

Version data entries

96 entries across 96 versions & 1 rubygems

Version	Path
trackler-2.2.1.91	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.90	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.89	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.88	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.87	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.86	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.85	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.84	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.83	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.82	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.81	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.80	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.79	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.78	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.77	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.76	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.75	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.74	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.73	tracks/elixir/exercises/binary/README.md
trackler-2.2.1.72	tracks/elixir/exercises/binary/README.md