Bowling in Rust
Score a bowling game
exercism fetch rust bowling
Score a bowling game.
Bowling is a game where players roll a heavy ball to knock down pins arranged in a triangle. Write code to keep track of the score of a game of bowling.
The game consists of 10 frames. A frame is composed of one or two ball throws with 10 pins standing at frame initialization. There are three cases for the tabulation of a frame.
An open frame is where a score of less than 10 is recorded for the frame. In this case the score for the frame is the number of pins knocked down.
A spare is where all ten pins are knocked down by the second throw. The total value of a spare is 10 plus the number of pins knocked down in their next throw.
A strike is where all ten pins are knocked down by the first throw. The total value of a strike is 10 plus the number of pins knocked down in the next two throws. If a strike is immediately followed by a second strike, then the value of the first strike cannot be determined until the ball is thrown one more time.
Here is a three frame example:
|Frame 1||Frame 2||Frame 3|
|X (strike)||5/ (spare)||9 0 (open frame)|
Frame 1 is (10 + 5 + 5) = 20
Frame 2 is (5 + 5 + 9) = 19
Frame 3 is (9 + 0) = 9
This means the current running total is 48.
The tenth frame in the game is a special case. If someone throws a strike or a spare then they get a fill ball. Fill balls exist to calculate the total of the 10th frame. Scoring a strike or spare on the fill ball does not give the player more fill balls. The total value of the 10th frame is the total number of pins knocked down.
For a tenth frame of X1/ (strike and a spare), the total value is 20.
For a tenth frame of XXX (three strikes), the total value is 30.
Write code to keep track of the score of a game of bowling. It should support two operations:
roll(pins : int)is called each time the player rolls a ball. The argument is the number of pins knocked down.
score() : intis called only at the very end of the game. It returns the total score for that game.
Refer to the exercism help page for Rust installation and learning resources.
Writing the Code
Execute the tests with:
$ cargo test
All but the first test have been ignored. After you get the first test to
pass, open the tests source file wich is located in the
and remove the
#[ignore] flag from the next test and get the tests to pass
again. Each separate test is a function with
#[test] flag above it.
Continue, until you pass every test.
If you wish to run all tests without editing the tests source file, use:
$ cargo test -- --ignored
To run a specific test, for example
some_test, you can use:
$ cargo test some_test
If the specfic test is ignored use:
$ cargo test some_test -- --ignored
To learn more about Rust tests refer to the online test documentation
Make sure to read the Modules chapter if you haven't already, it will help you with organizing your files.
Feedback, Issues, Pull Requests
The exercism/rust repository on GitHub is the home for all of the Rust exercises. If you have feedback about an exercise, or want to help implement new exercises, head over there and create an issue. Members of the rust track team are happy to help!
If you want to know more about Exercism, take a look at the contribution guide.
The Bowling Game Kata at but UncleBob http://butunclebob.com/ArticleS.UncleBob.TheBowlingGameKata
Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.