Scala While Loop

by Online Tutorials Library July 14, 2022

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

Flowchart:

Scala While loop 1

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:

10  12  14  16  18  20

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:

10  12  14  16  18  20

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

Next TopicScala for loop

Scala While Loop

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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