This document outlines the pre-lab, in-lab, and post-lab activities for a Scala programming lab session. The pre-lab questions cover the differences between functional and object-oriented programming, illustrating data types in Scala, and writing a program to calculate the sum, difference, and product of two numbers. The in-lab activities involve initializing variables of all data types and writing a program to find the minimum and maximum values in an array. The post-lab question involves parsing values from a string into their corresponding types in Scala.

1. 19CS3056S Functional and Concurrent Programming
6
LAB SESSION 01: Introduction to Scala
Date of the Session: _ / / Time of the Session: _ to
Prerequisite:
• Basics of Scala – data types
• Statements and expressions
• Declarations
Pre-Lab:
Answer the following questions:
1. As we stepped into a new programming language, first of all we need to know how
functional programming is differ from object oriented programming language.so draft
some differences
A:
functional programming:-
* This programming paradigm emphasizes on the use of functions where each function
performs a specific task.
* Importance is not given to data but to functions.
* It uses recursion for iteration.
object oriented programming:-
* This programming paradigm is based on object oriented concept. Classes are used
where instance of objects are created
*
Importance is given to data rather than procedures.
* The statements in this programming paradigm need to follow a order i.e., bottom up
approach while execution.
2. Below is a programwhich illustrates thedata types. Executethecode and understand the output.

2. 19CS3056S Functional and Concurrent Programming
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// Scala programto illustrate Data types object Test
{
def main(args: Array[String])
{
var a: Boolean = true var
a1: Byte = 126
var a2: Float = 2.45673f
var a3: Int = 3

3. 19CS3056S Functional and Concurrent Programming
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var a4: Short = 45
var a5: Double = 2.93846523
var a6: Char = 'A'
if (a == true)
{
println("boolean: welcome to functional programming!!")
}
println("byte:" + a1)
println("float:" + a2)
println("integer:" +
a3) println("short:" +
a4) println("double:"
+ a5) println("char:"
+ a6)
}
}
A:
3. As Harry is in charge for Scala laboratory. He wants to check the basics for his students and
asked them to print the sum, difference and product of two numbers by taking input from
console.
Input format:
The first line contains n(first no) and m(second number)
Constraints:
n < 1000
m < 1000
A:
object harry {
def main(args: Array[String]) {

4. 19CS3056S Functional and Concurrent Programming
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var n=20;
var m=10;
println("The sum is : "+(n+m));
println("The product is : "+(n*m));
println("The difference is : "+(n-m));
}
}

5. 19CS3056S Functional and Concurrent Programming
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6. 19CS3056S Functional and Concurrent Programming
11
In-Lab:
1. Grace is new to programming and she wants to learn Scala programming. You need to help her
to initialize variables of all the data types and print the values on console.
Example: An example is shown for single variable. This has to be applied for all the data types
var a3: Int = 3
println("integer:" + a3)
A:
Code:-
object MyClass {
def main(args: Array[String])
{
var a: Boolean = true
var a1: Byte = 126
var a2: Float = 2.45673f
var a3: Int = 3
var a4: Short = 45
var a5: Double = 2.93846523
var a6: Char = 'A'
if (a == true)
{
println("boolean: welcome to functional programming!!")
}
println("byte:" + a1)
println("float:" + a2)
println("integer:" +a3)
println("short:" +a4)
println("double:"+ a5)
println("char:"+ a6)
}
}

7. 19CS3056S Functional and Concurrent Programming
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8. 19CS3056S Functional and Concurrent Programming
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2. Rohit wants to find the maximum and minimum of salaries that his firm pays which are
inputted in the form an array. Can you help him by writing a Scala program that completes
the task for him.
A:code:-
object MyClass {
val array = Array(3,4,62,8,9,2,1)
if(array.isEmpty) throw new IllegalArgumentException
val (minimum, maximum) = array.foldLeft((array.head, array.head)) {
case ((min, max), next) =>
if(next > max) (min, next)
else if(next < min) (next, max)
else (min, max)
}
println(minimum, maximum);
}

9. 19CS3056S Functional and Concurrent Programming
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3. Dora wants to remember week days with the help of numbers. She wants your help to make
a program that prints numbers according to week days.
Example: 0-Sunday 1-Monday 2-Tuesday so on
A:

10. 19CS3056S Functional and Concurrent Programming
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Post-Lab:
1. Your friend gave you a String "Vanilla Donut 10 2.25", where the literal Vanilla Donut is a
particular donut, the 10 literal is the quantity purchased, and 2.25 is the unit price of each Vanilla
Donut. You further need to cast each token from the input String to their corresponding types, such
as, an Int, Double or String. Parse the corresponding values usingScala.
A:

11. only)
Signature of the Evaluator Date of Evaluation:
19CS3056S Functional and Concurrent Programming
Viva – voice:
1. WhichScala libraryis used for functional programming?
A:
2. What is a ‘Scala set’?What are methods throughwhichoperationsets are
expressed?
A:
3. HowisScala aprogramming languagewitha combinationof bothfunctionaland object-
orientedprogramming?
A:
4. Explainthe functionalityof
Yield? A:
5. What is the advantageofusingScala overotherfunctional programming
languages?Define the features of ImmutableVariables?
A:
(For Evaluator’s use
Comment of the Evaluator (if Any) Evaluator’s Observation
Marks Secured: out of
Full Name of the Evaluator: