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Scala while(condition) { Conditional code; } Condition If condition is true Conditional Code If Condition is false 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. Try the following example program to understand loop control statements (while statement) in Scala Programming Language. object Demo { 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; 56
Scala } } } Save the above program in Demo.scala. The following commands are used to compile and execute this program. \>scalac Demo.scala \>scala Demo Output 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 do-while loop Unlike while loop, which tests the loop condition at the top of the loop, the do-while loop checks its condition at the bottom of the loop. A do-while loop is similar to a while loop, except that a do-while loop is guaranteed to execute at least one time. Syntax The following is the syntax for do-while loop. do{ statement(s); }while( condition ); Notice that the conditional expression appears at the end of the loop, so the statement(s) in the loop execute once before the condition is tested. If the condition is true, the flow of control 57
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Scala About the Tutorial Scala is a
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Scala 4. SCALA - DATA .............
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Scala Higher-Order Functions ......
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Scala Regular-Expression Examples .
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Scala Scala can Execute Java Code S
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Scala We assume that the readers of
Page 14 and 15: Scala Windows \>scala -version Scal
Page 16 and 17: Scala Welcome to Scala version 2.9.
Page 18 and 19: Scala $salary, 123abc, -salary Oper
Page 20 and 21: Scala Newline Characters Scala is a
Page 22 and 23: 4. SCALA - DATA Scala Scala has all
Page 24 and 25: Scala "Hello,\nWorld!" "This string
Page 26 and 27: 5. SCALA - VARIABLES Scala Variable
Page 28 and 29: Scala } Save the above program in D
Page 30 and 31: Methods Variables 6. SCALA - CLASSE
Page 34 and 35: Scala \>scala Demo Output Point x l
Page 36 and 37: Scala Implicit classes may not be
Page 38 and 39: 7. SCALA - ACCESS MODIFIERS Scala T
Page 40 and 41: Scala } Scope of Protection Access
Page 42 and 43: 8. SCALA - OPERATORS Scala An opera
Page 44 and 45: Scala == (Equal) 1 Checks if the va
Page 46 and 47: Scala It is called Logical AND oper
Page 48 and 49: Scala Ex: (A & B) will give 12, whi
Page 50 and 51: Scala \>scala Demo Output: a & b =
Page 52 and 53: Scala Try the following example pro
Page 54 and 55: Scala c &= a = 0 c ^= a = 10 c |= a
Page 56 and 57: 9. SCALA - IF ELSE STATEMENT Scala
Page 58 and 59: Scala if(Boolean_expression){ //Exe
Page 60 and 61: Scala }else if( x == 30 ){ println(
Page 62 and 63: 10. SCALA - LOOP STATEMENTS Scala T
Page 66 and 67: Scala jumps back up to do, and the
Page 68 and 69: Scala object Demo { } def main(args
Page 70 and 71: Scala } } Save the above program in
Page 72 and 73: Scala Scala's for loop allows to fi
Page 74 and 75: Scala \>scalac Demo.scala \>scala D
Page 76 and 77: Scala object Demo { def main(args:
Page 78 and 79: Scala Output: Value of a: 1 Value o
Page 80 and 81: 11. SCALA - FUNCTIONS Scala A funct
Page 82 and 83: Scala var sum:Int = 0 sum = a + b r
Page 84 and 85: Scala println("Arg value[" + i + "]
Page 88 and 89: Scala logWithDateBound("message3" )
Page 90 and 91: Scala \>scala Demo Output Factorial
Page 92 and 93: Scala Currying Functions Currying t
Page 94 and 95: 12. SCALA - CLOSURES Scala A closur
Page 96 and 97: 13. SCALA - STRINGS Scala This chap
Page 98 and 99: Scala "My name is ".concat("Zara");
Page 100 and 101: Scala val name = “James” printl
Page 102 and 103: Scala b String Methods Following is
Page 104 and 105: Scala 27 28 29 30 31 32 33 34 35 36
Page 106 and 107: 14. SCALA - ARRAYS Scala Scala prov
Page 108 and 109: Scala } println("Total is " + total
Page 110 and 111: Scala Save the above program in Dem
Page 112 and 113: Scala print( " " + x ) } println()
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15. SCALA - COLLECTIONS Scala Scala
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Scala val nums = Nil println( "Head
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Scala } Save the above program in D
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Scala 1 2 3 4 5 6 7 8 9 10 11 12 13
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Scala 34 35 36 37 38 39 40 41 42 43
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Scala Find Common Values Insets You
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Scala 14 def diff(that: Set[A]): Se
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Scala 39 def sum: A Returns the sum
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Scala val nums: Map[Int, Int] = Map
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Scala colors.keys.foreach{ i => pri
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Scala 5 def iterator: Iterator[(A,
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Scala 30 def min: (A, B) Finds the
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Scala You can use Tuple to write a
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Scala Concatenated String: (1,hello
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Scala } } Save the above program in
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Scala 2 def isEmpty: Boolean Return
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Scala number of words Find Min & Ma
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Scala 4 def ++[B >: A](that :=> Gen
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Scala 28 def max: A Finds the large
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16. SCALA - TRAITS Scala A trait en
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Scala Value classes and Universal T
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17. SCALA - PATTERN MATCHING Scala
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Scala val charlie = new Person("Cha
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18. SCALA - REGULAR EXPRESSIONNS Sc
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Scala \\n Back-reference to capture
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Scala val pattern = new Regex("abl[
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Scala } } } } Save the above progra
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20. SCALA - EXTRACTORS Scala An ext
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Scala def main(args: Array[String])
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Scala print("Please enter your inpu
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