Kata: Bowling Game

Create a program, which, given a valid sequence of rolls for one line of American Ten-Pin Bowling, produces the total score for the game. This is a summary of the rules of the game:

• Each game, or "line" of bowling, includes ten turns, or "frames"for the bowler.
• In each frame, the bowler gets up to two tries to knock down all the pins.
• If in two tries, he fails to knock them all down, his score for that frame is the total number of pins Knocked down in his two tries.
• If in two tries he knocks them all down, this is called a "spare" and his score for the frame is ten plus the number of pins knocked down on his next throw (in his next turn).
• If on his first try in the frame he knocks down all the pins, this is called a "strike" His turn is over, and his score for the frame is ten plus the simple total of the pins knocked down in his next two rolls.
• If he gets a spare or strike in the last (tenth) frame, the bowler gets to throw one or two more bonus balls, respectively. - These bonus throws are taken as part of the same turn. If the bonus throws knock down all the pins, the process does not repeat: the bonus throws are only used to calculate the score of the final frame.

Kata: Bowling Game

• The game score is the total of all frame scores.

Here are some things that the program will not do:

• We will not check for valid rolls.
• We will not check for correct number of rolls and frames.
• We will not provide scores for intermediate frames.

The input is a scorecard from a finished bowling game, where "X" stands for a strike, "-" for no pins bowled, and "/" means a spare. Otherwise figures 1-9 indicate how many pins were knocked down in that throw.

Sample games:

12345123451234512345

always hitting pins without getting spares or strikes, a total score of 60

XXXXXXXXXXXX

a perfect game, 12 strikes, giving a score of 300

9-9-9-9-9-9-9-9-9-9-

heartbreak - 9 pins down each round, giving a score of 90

5/5/5/5/5/5/5/5/5/5/5 a spare every round, giving a score of 150