exercism/racket/grains

Grains

Welcome to Grains on Exercism's Racket Track. If you need help running the tests or submitting your code, check out HELP.md.

Instructions

Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.

There once was a wise servant who saved the life of a prince. The king promised to pay whatever the servant could dream up. Knowing that the king loved chess, the servant told the king he would like to have grains of wheat. One grain on the first square of a chess board, with the number of grains doubling on each successive square.

There are 64 squares on a chessboard (where square 1 has one grain, square 2 has two grains, and so on).

Write code that shows:

• how many grains were on a given square, and
• the total number of grains on the chessboard

For bonus points

Did you get the tests passing and the code clean? If you want to, these are some additional things you could try:

• Optimize for speed.
• Optimize for readability.

Then please share your thoughts in a comment on the submission. Did this experiment make the code better? Worse? Did you learn anything from it?

Source

Created by

• @arguello

Contributed to by

• @mbertheau
• @PurityControl
• @yurrriq

Based on

JavaRanch Cattle Drive, exercise 6 - http://www.javaranch.com/grains.jsp