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`.

The Scala exercises assume an SBT project scheme. The exercise solution source
should be placed within the exercise directory/src/main/scala. The exercise
unit tests can be found within the exercise directory/src/test/scala.

To run the tests simply run the command `sbt test` in the exercise directory.

For more detailed info about the Scala track see the [help
page](http://exercism.io/languages/scala).


## 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

74 entries across 74 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/scala/exercises/binary/README.md
trackler-2.2.1.179	tracks/scala/exercises/binary/README.md
trackler-2.2.1.178	tracks/scala/exercises/binary/README.md
trackler-2.2.1.177	tracks/scala/exercises/binary/README.md
trackler-2.2.1.176	tracks/scala/exercises/binary/README.md
trackler-2.2.1.175	tracks/scala/exercises/binary/README.md
trackler-2.2.1.174	tracks/scala/exercises/binary/README.md
trackler-2.2.1.173	tracks/scala/exercises/binary/README.md
trackler-2.2.1.172	tracks/scala/exercises/binary/README.md
trackler-2.2.1.171	tracks/scala/exercises/binary/README.md
trackler-2.2.1.170	tracks/scala/exercises/binary/README.md
trackler-2.2.1.169	tracks/scala/exercises/binary/README.md
trackler-2.2.1.167	tracks/scala/exercises/binary/README.md
trackler-2.2.1.166	tracks/scala/exercises/binary/README.md
trackler-2.2.1.165	tracks/scala/exercises/binary/README.md
trackler-2.2.1.164	tracks/scala/exercises/binary/README.md
trackler-2.2.1.163	tracks/scala/exercises/binary/README.md
trackler-2.2.1.162	tracks/scala/exercises/binary/README.md
trackler-2.2.1.161	tracks/scala/exercises/binary/README.md
trackler-2.2.1.160	tracks/scala/exercises/binary/README.md