Your task is to convert a number into a string that contains raindrop sounds corresponding to certain potential factors. A factor is a number that evenly divides into another number, leaving no remainder. The simplest way to test if a one number is a factor of another is to use the modulo operation.

The rules of raindrops are that if a given number:

has 3 as a factor, add 'Pling' to the result.
has 5 as a factor, add 'Plang' to the result.
has 7 as a factor, add 'Plong' to the result.
does not have any of 3, 5, or 7 as a factor, the result should be the digits of the number.

Examples

28 has 7 as a factor, but not 3 or 5, so the result would be "Plong".
30 has both 3 and 5 as factors, but not 7, so the result would be "PlingPlang".
34 is not factored by 3, 5, or 7, so the result would be "34".

Getting Started

Make sure you have read the "Guides" section of the C track on the Exercism site. This covers the basic information on setting up the development environment expected by the exercises.

Passing the Tests

Get the first test compiling, linking and passing by following the three rules of test-driven development.

The included makefile can be used to create and run the tests using the test task.

make test

Create just the functions you need to satisfy any compiler errors and get the test to fail. Then write just enough code to get the test to pass. Once you've done that, move onto the next test.

As you progress through the tests, take the time to refactor your implementation for readability and expressiveness and then go on to the next test.

Try to use standard C99 facilities in preference to writing your own low-level algorithms or facilities by hand.

Source

A variation on FizzBuzz, a famous technical interview question that is intended to weed out potential candidates. That question is itself derived from Fizz Buzz, a popular children's game for teaching division. https://en.wikipedia.org/wiki/Fizz_buzz

Submitting Incomplete Solutions

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