Learning Haskell Day2
Today I learned about truth values and
basic types. Truth values similar to other high-level programming
languages. There are two variables such as “True” and “False”.
If a condition is not right it will be false otherwise true. For
example this program print False
sq x = x * x
main=print(sq 2 ==5 )
Or this one will return true
vol x y z = x*y*z
main=print(vol 3 4 5 == 60).
Of course we can do some boolean
operation like “and” and “or”.For and we use && and
if one of the condition is false it will be false.For or we use || it
is enough to being true if one of them is true.For example:
main=do
print(3==3 && 4==2)
print(3==3 || 4==2)
print((==) 3 5 )
the output like
false true false
first two line is seems normal but
third condition is different. The == operator can bu used like a
prefix operator even it take two arguments.
Types in Haskell very similar to other
programming languages char strings... . If you want to learn a type
of a variables on ghci you can use :type ot :t for example :t True
will be return boolean.
