Question

How to declare a variable in Scala?

Answer 1

The following is an example program that explains the process of variable declaration in Scala. This program declares four variables — two variables are defined with type declaration and the remaining two are without type declaration.

Example

object Demo {
   def main(args: Array[String]) {
      var myVar :Int = 10;
      val myVal :String = "Hello Scala with datatype declaration.";
      var myVar1 = 20;
      val myVal1 = "Hello Scala new without datatype declaration.";
      
      println(myVar); println(myVal); println(myVar1); 
      println(myVal1);
   }
}

Save the above program in Demo.scala. The following commands are used to compile and execute this program.

Command

\>scalac Demo.scala
\>scala Demo

Output

10
Hello Scala with datatype declaration.
20
Hello Scala without datatype declaration.