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# Pascal's Triangle
Compute Pascal's triangle up to a given number of rows.
In Pascal's Triangle each number is computed by adding the numbers to
the right and left of the current position in the previous row.
```text
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
# ... etc
```
## Running tests
In order to run the tests, issue the following command from the exercise
directory:
For running the tests provided, `rebar3` is used as it is the official build and
dependency management tool for erlang now. Please refer to [the tracks installation
instructions](http://exercism.io/languages/erlang/installation) on how to do that.
In order to run the tests, you can issue the following command from the exercise
directory.
```bash
$ rebar3 eunit
```
### Test versioning
Each problem defines a macro `TEST_VERSION` in the test file and
verifies that the solution defines and exports a function `test_version`
returning that same value.
To make tests pass, add the following to your solution:
```erlang
-export([test_version/0]).
test_version() ->
1.
```
The benefit of this is that reviewers can see against which test version
an iteration was written if, for example, a previously posted solution
does not solve the current problem or passes current tests.
## Questions?
For detailed information about the Erlang track, please refer to the
[help page](http://exercism.io/languages/erlang) on the Exercism site.
This covers the basic information on setting up the development
environment expected by the exercises.
## Source
Pascal's Triangle at Wolfram Math World [http://mathworld.wolfram.com/PascalsTriangle.html](http://mathworld.wolfram.com/PascalsTriangle.html)
## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
Version data entries
40 entries across 40 versions & 1 rubygems