Scala while Loop


A while loop statement repeatedly executes a target statement as long as a given condition is true.


The syntax of a while loop in Scala is:


Here, statement(s) may be a single statement or a block of statements. The condition may be any expression, and true is any nonzero value. The loop iterates while the condition is true. When the condition becomes false, program control passes to the line immediately following the loop.

Flow Diagram:

Scala while loop

Here, key point of the while loop is that the loop might not ever run. When the condition is tested and the result is false, the loop body will be skipped and the first statement after the while loop will be executed.


object Test {
   def main(args: Array[String]) {
      // Local variable declaration:
      var a = 10;

      // while loop execution
      while( a < 20 ){
         println( "Value of a: " + a );
         a = a + 1;

When the above code is compiled and executed, it produces the following result:

C:/>scalac Test.scala
C:/>scala Test
value of a: 10
value of a: 11
value of a: 12
value of a: 13
value of a: 14
value of a: 15
value of a: 16
value of a: 17
value of a: 18
value of a: 19