Body Mass Index program in haskell
- by user364996
Hi there.
I'm trying to write a simple program in Haskell that can determine someone's body mass index.
Here's what I have written:
type Height = Float
type Weight = Float
type PeopleStats = [(String, Height, Weight)]
and...
bmi :: Height -> Weight -> Float
bmi heightCm weightKg = weightKg/(heightCm)^2
healthy :: Height -> Weight -> Bool
healthy heightCm weightKg
| 25 > index && 18 < index = True
| otherwise = False
where index = bmi heightCm weightKg
So far, the function "healthy" can calculate someone's BMI, and the function "healthyPeople" returns a boolean statement determining if the person's BMI falls within the limits which is considered normal for a healthy person.
I want to write a function called "healthyPeople".
healthyPeople :: PeopleStats -> [String]
This function needs to take a list of PeopleStats and returns a list of names (Strings) of people who are deemed to be "healthy" from the "healthy" function.
For example:
If I input [("Lee", 65, 185), ("Wang", 170, 100), ("Tsu", 160, 120)] I will get a list of the names of the people whose BMI returns true form the boolean function in "healthy".
Please help !!!!
