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Scala while loop

In Scala, while loop is used to iterate code till the specified condition. It tests boolean expression and iterates again and again. You are recommended to use while loop if you don't know number of iterations prior.

Syntax

while(boolean expression){
	// Statements to be executed
}

Flowchart:

Scala while loop Example

object MainObject {
   def main(args: Array[String]) {
      var a = 10;      	 				// Initialization
      while( a<=20 ){      			// Condition
         println(a);
         a = a+2               			// Incrementation
      }
   }
}

Output:

Scala Infinite While Loop Example

You can also create an infinite while loop. In the below program, we just passed true in while loop. Be careful, while using infinite loop.

object MainObject {
   def main(args: Array[String]) {
      var a = 10;       	// Initialization
      while( true ){    	// Condition
         println(a);
         a = a+2        	// Incrementation
      }
   }
}

Output:

10
12
14
16
...
Ctr+Z	// To stop execution

Scala do-while loop example

object MainObject {
   def main(args: Array[String]) {
        var a = 10;         // Initialization
        do {
            println( a );
            a = a + 2;      // Increment
        }
        while( a <= 20 )     // Condition
   }
}

Output:

Scala Infinite do-while loop

In scala, you can create infinite do-while loop. To create infinite loop just pass true literal in loop condition.

Let's see an example.

object MainObject {
   def main(args: Array[String]) {
        var a = 10;         				// Initialization
        do {
            println( a );
            a = a + 2;      				// Increment
        }
        while( true)    					 // Condition
   }
}

Output:

10
12
14
16
...
Ctrl+Z	// To stop execution of program

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Scala Tutorial

Scala Functions

Scala OOPs Concepts

Scala Abstract Class

Scala Trait

Scala Access Modifiers

Scala Array

Scala String

Scala Exceptions

Scala Collections

Scala Tuple

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Scala Multihreading

Akka Tutorial

Scala while loop

Flowchart:

Scala while loop Example

Scala Infinite While Loop Example

Scala do-while loop example

Scala Infinite do-while loop

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