Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Haskell Program to read the height of a person and the print person is taller, dwarf, or average height person
This tutorial will help us in reading the height of a person and printing if the person is taller, dwarf or average height person on being compared. The height value (in centimeters) is passed as argument to the function defined and then the height is being compared with the condition defined in Haskell. And the final output is displayed.
Algorithm
Step 1 − Program execution will be started from main function. The main() function has whole control of the program.
Step 2 − Create user defined function to perform the task
Step 3 − The if-else statement is defined over the height as if height > 180, the person is tall; else if height < 150, the person is dwarf ; else the person has average height.
Step 4 − The final output is displayed after comparing the height value, by using ‘putStrLn’ statement.
Using if-else Statement
In this example, we will use if-else statement to check the value of height and prints the appropriate message.
Example 1
main :: IO ()
main = do
let height = 165
if height > 180
then putStrLn "You are a tall person."
else if height < 150
then putStrLn "You are a dwarf."
else putStrLn "You are an average height person."
Output
You are an average height person.
Using User-defined Function
In this example, the heightDescription function is used to determine the description of the person's height based on their input. The heightDescription function uses guards to check the value of the input against various conditions, and returns the appropriate string based on the input.
Example 2
main :: IO () main = do let height = 185 putStrLn (heightDescription height) heightDescription :: Float -> String heightDescription height | height > 180 = "You are a tall person." | height < 150 = "You are a dwarf." | otherwise = "You are an average height person."
Output
You are a tall person.
Using Pattern Matching
In this example, the pattern matching is used to determine the description of the person's height based on their input.
Example 3
main :: IO ()
main = do
let height = 145
putStrLn (heightDescription height)
heightDescription :: Float -> String
heightDescription height =
case height of
h | h > 180 -> "You are a tall person."
h | h < 150 -> "You are a dwarf."
_ -> "You are an average height person."
Output
You are a dwarf.
Conclusion
In Haskell, there are various ways to read the height of a person and then predict its height description. To check the same we can use, if-else statement, user-defined heightDescription function or by using pattern matching. The height value is passed as an argument to these functions and then the height description of the person is displayed as output.
77 Views
