Float numbers are decimal numbers in Haskell. They can be declared and used just like any other data type in Haskell. Here's an example of how to use float numbers in Haskell:
-- Declare a variable of type float
myFloat :: Float
myFloat = 3.14
-- Declare a function that takes in two float numbers and returns their sum
addFloats :: Float -> Float -> Float
addFloats x y = x + y
-- Call the function with two float arguments
result :: Float
result = addFloats 3.14 2.71
-- Print the result to the console
main :: IO ()
main = print result
In this example, we declare a variable myFloat of type Float and assign it the value of 3.14. We also define a function addFloats that takes in two float numbers and returns their sum. We call this function with two numeric arguments, 3.14 and 2.71, and assign the result to the variable result. Finally, we print the result to the console using the print function.
Note that float values are rounded to the nearest binary approximation, and thus can suffer from precision errors over long calculations. For more precision, Haskell offers the Double type, which represents double-precision floating-point numbers.