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+# 20CYS312 - Principles of Programming Languages
+![](https://img.shields.io/badge/Batch-21CYS-lightgreen) ![](https://img.shields.io/badge/UG-blue) ![](https://img.shields.io/badge/Subject-PPL-blue) <br/>
+![](https://img.shields.io/badge/Lecture-2-orange) ![](https://img.shields.io/badge/Practical-3-orange) ![](https://img.shields.io/badge/Credits-3-orange)
+
+## Lecture 5 - Types (Continued)
+![](https://img.shields.io/badge/-06th_Mar-orange)
+
+### Usage Variants
+
+```
+-- Define the Student type
+type Student = (Int, String, String)
+
+-- Function to create an student
+createStudent :: Int -> String -> String -> Student
+createStudent rollNo stuFName stuLName =
+    (rollNo, stuFName, stuLName)
+
+-- Main Function
+main :: IO ()
+main = do
+    let student = createStudent 44 "Ramaguru" "Radhakrishnan"
+    putStrLn $ "Student details: " ++ show student
+
+```
+
+```
+-- Define the Student type
+type Student = (Int, String, String)
+
+-- Function to create a student
+createStudent :: Int -> String -> String -> Student
+createStudent rollNo stuFName stuLName =
+    (rollNo, stuFName, stuLName)
+
+-- Function to get the roll number of a student
+getRollNo :: Student -> Int
+getRollNo (rollNo, _, _) = rollNo
+
+-- Function to get the full name of a student
+getFullName :: Student -> String
+getFullName (_, stuFName, stuLName) = stuFName ++ " " ++ stuLName
+
+-- Function to update the first name of a student
+updateFirstName :: Student -> String -> Student
+updateFirstName (rollNo, _, stuLName) newFirstName = (rollNo, newFirstName, stuLName)
+
+-- Function to update the last name of a student
+updateLastName :: Student -> String -> Student
+updateLastName (rollNo, stuFName, _) newLastName = (rollNo, stuFName, newLastName)
+
+-- Main Function
+main :: IO ()
+main = do
+    let student = createStudent 44 "Ramaguru" "Radhakrishnan"
+    putStrLn $ "Student details: " ++ show student
+    putStrLn $ "Roll number: " ++ show (getRollNo student)
+    putStrLn $ "Full name: " ++ getFullName student
+    let updatedStudent = updateFirstName student "Rama"
+    putStrLn $ "Updated student details: " ++ show updatedStudent
+```
+
+### Home Work
+Write a Haskell Program to define a new type ```Employee``` is defined as a type synonym for a tuple containing an ```Int(employee ID)```, two ```Strings (employee name and department)```
+, a ```Float (salary)```, and an ```Int (years of service)```. The ```createEmployee``` function creates a new Employee tuple with the given values. The ```calculateTotalSalary``` function 
+calculates the ```total salary``` of an employee by multiplying their ```salary``` with their ```years of service```.