Input/Output

Question 1

What is an Action

Answer 1

An action is a value of type IO a that, when performed, may do some input/output, before delivering a value of type a.
Example putStrLn :: String -> IO()

Question 2

What does the bind operator&raquo_space;= do?

Answer 2

Passes the result of performing a first action to a parameterised second action i.e
snooper = readFile “/etc/passwd”&raquo_space;=
putStrLn

Question 3

Do notation

Answer 3

Do notation provides a convenient notation for the&raquo_space;= and&raquo_space; operators

test fn s
= do writeFile fn s
readFile fn

Question 4

Why is traditional parallel programming hard?

Answer 4

One must
conceive of a parallel algorithm
express the algorithm using tasks
map the tasks onto processors
ensure that scheduling avoids deadlock.

Question 5

Why is function parallel programming easier?

Answer 5

One must

conceive of a parallel algorithm

Question 6

Why would a sequential algorithm not work well on multiprocessor machine

Answer 6

Only one processor can get involved.

Question 7

Before creating a task to evaluate an expression one must consider:

Answer 7

is the result going to be useful
is the computation large enough
is there spare processing capacity