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Scala Solved Examples, Programs, Source Code Snippets.

SCALA stands for scalable programming language; SCALA is an object oriented, hybrid functional programming language. It has the features of an Object Oriented and Functional programming language. SCALA programming language was created by Martin Odersky.

Reference: https://www.tutorialspoint.com/scala/scala_overview.htm

How to compile & run Scala program

To compile and run a scala program, use follow commands:

\>scalac prg_name.scala
\>scala prg_name 

Here are the few example programs on Scala Programming Language:

  1. Scala program to print your name.
  2. Scala program to find largest number among two numbers.
  3. Scala program to find a number is positive, negative or positive.
  4. Scala program to declare string variable and print the string.
  5. Scala program to demonstrate example of multiple variables declarations and assignments.
  6. Scala program to print numbers from 1 to 100 using for loop.
  7. Scala program to print numbers from 1 to 100 using for loop with until to determine loop range.
  8. Scala program to demonstrate example of collection list and for loop.
  9. Scala program to create a user define function to return largest number among two numbers.
  10. Scala program of array - Declare, print and calculate sum of all elements.

1) Scala program to print your name.

/*Scala program to print your name*/
    object ExPrintName {
       def main(args: Array[String]) {
           println("My name is Mike!")
       }
    }
    

Output

My name is Mike!

2) Scala program to find largest number among two numbers.

/**Scala  Program to find largest number among two numbers.*/

    object ExFindLargest {
       def main(args: Array[String]) {
          var number1=20;
          var number2=30;
          var x = 10;

          if( number1>number2){
             println("Largest number is:" + number1);
          }
          else{
              println("Largest number is:" + number2);
          }
       }
    }
    

Output

Largest number is:30

3) Scala program to find a number is positive, negative or positive.

/**Scala program to find a number is positive, negative or positive.*/

    object ExCheckNumber {
       def main(args: Array[String]) {
        
            /**declare a variable*/
            var number= (-100);
       
           if(number==0){
               println("number is zero");
           }
           else if(number>0){
               println("number is positive");
           }
           else{
               println("number is negative");
           }
       }
    }
    

Output

number is negative

4) Scala program to declare string variable and print the string.

object ExampleString {
   def main(args: Array[String]) {
        
        //declare and assign string variable "text"
        val text : String = "You are reading SCALA programming language.";
        
        //print the value of string variable "text"
        
        println("Value of text is: " + text);
        
   }
}

Output

Value of text is: You are reading SCALA programming language.

5) Scala program to demonstrate example of multiple variables declarations and assignments.

In this example we will learn, how we can declare and assign multiple variables together?

/*Scala program to demonstrate example of multiple 
variables declarations and assignments.*/

object ExampleVarDecAndAssin {
   def main(args: Array[String]) {
      
      var (name: String, age: Int) = Pair("Mike",21);

      //print values
      println("Name:   "+name);
      println("Age:    "+age);
      
      //declaration without specifying data type
      var (address,mobile)=Pair("New Delhi, India",1234567890);
      
      //print values
      println("Address:   "+address);
      println("Mobile:    "+mobile);      
            
   }
}

Output

Name:   Mike
Age:    21
Address:   New Delhi, India
Mobile:    1234567890

6) Scala program to print numbers from 1 to 100 using for loop.

In this example we will learn, how we can print number from 1 to 100 in Scala using to keyword?

/*Scala program to print numbers from 1 to 100 
using for loop.*/

object ExampleForLoop1 {
   def main(args: Array[String]) {
      var counter: Int=0;
      
      for(counter <- 1 to 100)
        print(counter + " ");
    
      // to print new line
      println();
   }
}

Output

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 
92 93 94 95 96 97 98 99 100 

7) Scala program to print numbers from 1 to 100 using for loop with until to determine loop range.

In this example we will learn, how we can print number from 1 to 100 in Scala using until keyword?

/*Scala program to print numbers from 1 to 100 
using for loop with until to determine loop range.*/

object ExampleForLoop2 {
   def main(args: Array[String]) {
      var counter: Int=0;
      
      for(counter <- 1 until 101)
        print(counter + " ");
    
      // to print new line
      println();
   }
}

Output

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 
92 93 94 95 96 97 98 99 100 

8) Scala program to demonstrate example of collection list and for loop.

In this program we will learn, how we can declare integers collection and print using for loop?

/*Scala program to demonstrate example of 
collection list and for loop.*/

object ExampleForAndCollection {
   def main(args: Array[String]) {
      //declare an integer
      var N: Int=0;
      
      //declare integer list
      var numbers = List(100,200,300,400);
      
      //to print all numbers using for loop
      for(N<-numbers){
          println(N);
      }
      
   }
}

Output

100
200
300
400

9) Scala program to create a user define function to return largest number among two numbers.

In this example we will learn, how to create a user define function in Scala?

/*Scala program to create a user define function 
to return largest number among two numbers.*/

object ExampleUDFToGetLargestNumber {
    //function definition
    def getLargestNumber(x: Int, y: Int) : Int ={
        var largestNumber: Int=0;
        if(x>y)
            largestNumber=x;
        else
            largestNumber=y;
        
        return largestNumber;
    }
    
    def main(args: Array[String]) {
        var a: Int=10;
        var b: Int=20;
        
        //function calling
        println("Largest number from "+ a+" and "+ b +" is: "+ getLargestNumber(a,b));
        
    }
}

Output

Largest number from 10 and 20 is: 20

10) Scala program of array - Declare, print and calculate sum of all elements.

/*Scala program of array - Declare, print 
and calculate sum of all elements.*/

object ExampleArray1 {
    
   def main(args: Array[String]) {
       
      var numbers = Array(10,20,30,40,50);
      var N:Int=0;
      
      //print all array elements
      println("All array elements: ");
      for ( N <- numbers ) {
         println(N);
      }
      //calculating SUM of all elements
      var sum: Int=0;
      for ( N <- numbers ) {
         sum+=N;
      }      
      println("Sum of all array elements: "+sum);

   }
}

Output

    All array elements: 
    10
    20
    30
    40
    50
    Sum of all array elements: 150
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