Ch6 Discussion 02

The cityscape function takes in a list of integers representing the heights of buildings and puts out a single string that will show skyscrapers built of X’s in columns whose heights correspond to the integers.

Example:

cityscape [4,2,6,1]

Output:

  x
  x
x x
x x
xxx
xxxx

Make sure you test your program to verify that it works with two skyscrapers of the same height.

Notes

Make multiline output by adding \n characters into a string.

main = do
  putStrLn "Top\nMiddle\nBottom\nUnderground"

Editing Checklist

• Only uses of length are absolutely essential.
• Recursion uses (x:xs) not head and tail.
• Choices are made by patterns and guards, not if...then...else.
• Functions have names that indicate what they do.