README.md (1756B)

1 # Difference Of Squares 2 3 Find the difference between the square of the sum and the sum of the squares of the first N natural numbers. 4 5 The square of the sum of the first ten natural numbers is 6 (1 + 2 + ... + 10)² = 55² = 3025. 7 8 The sum of the squares of the first ten natural numbers is 9 1² + 2² + ... + 10² = 385. 10 11 Hence the difference between the square of the sum of the first 12 ten natural numbers and the sum of the squares of the first ten 13 natural numbers is 3025 - 385 = 2640. 14 15 ## Getting Started 16 17 Make sure you have read the "Guides" section of the 18 [C track](https://exercism.io/my/tracks/c) on the Exercism site. This covers 19 the basic information on setting up the development environment expected 20 by the exercises. 21 22 23 ## Passing the Tests 24 25 Get the first test compiling, linking and passing by following the [three 26 rules of test-driven development][3-tdd-rules]. 27 28 The included makefile can be used to create and run the tests using the `test` 29 task. 30 31 make test 32 33 Create just the functions you need to satisfy any compiler errors and get the 34 test to fail. Then write just enough code to get the test to pass. Once you've 35 done that, move onto the next test. 36 37 [3-tdd-rules]: http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd 38 39 As you progress through the tests, take the time to refactor your 40 implementation for readability and expressiveness and then go on to the next 41 test. 42 43 Try to use standard C99 facilities in preference to writing your own 44 low-level algorithms or facilities by hand. 45 46 ## Source 47 48 Problem 6 at Project Euler [http://projecteuler.net/problem=6](http://projecteuler.net/problem=6) 49 50 ## Submitting Incomplete Solutions 51 It's possible to submit an incomplete solution so you can see how others have completed the exercise.