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Boolean data type in Scala

Boolean in Scala: A Boolean is a data type that consists of only two values. Scala also supports Boolean values. In this Scala tutorial, we will learn about Boolean data types with a working example.
Submitted by Shivang Yadav, on July 14, 2019

Scala type | Boolean

A Boolean is a data type in Scala programming language (and another programming also), that is used or Boolean algebra. It has two valid values i.e. true and false.

• We declare it using the var keyword, with optional data type specified as Boolean.
• The default value for this data type is false.
• Also, for the compiler, the true value is treated as 1 and false is treated as 0.
• The size of the Boolean datatype is 1 bit.
• Boolean values are used to check for checking conditions of conditional statements, loops, etc.

Syntax:

    //Syntax with data type 
    var bool : Boolean = true; 
    
    //Syntax without data type
    var a = false;

When we don't specify the data type explicitly the compiler assigns the variable data type based on the value.

Example for Boolean data type in Scala

object MyClass {
    def add(x:Int, y:Int) = x + y;
    
    def main(args: Array[String]) {
        
        var bool = true; 
        var a : Boolean = false
        
        if(bool){
            println("the value of the bool variable is true");
        }
        if(a){
            println("the value of the a variable is true")
        }
        else
            println("the value of the a variable is false");
        
        bool = false //this is also possible 
    }
}

Output

the value of the bool variable is true
the value of the a variable is false

Code logic:

The code is to show the use of a Boolean variable. There are two boolean variables defined a and bool. bool is created without specifying the data type and a is created with data type and two if statements check for their value that leads to the generation of output.