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Unlike other for loop constructs, however, foreach loops [1] usually maintain no explicit counter: they essentially say "do this to everything in this set", rather than "do this x times". This avoids potential off-by-one errors and makes code simpler to read.
A loop is a sequence of statements which is specified once but which may be carried out several times in succession. The code "inside" the loop (the body of the loop, shown below as xxx) is obeyed a specified number of times, or once for each of a collection of items, or until some condition is met, or indefinitely. When one of those items is ...
[for x in 0... 100. do if x ** 2. > 3. then yield 2.* x] [| for x in 0... 100. do if x ** 2. > 3. then yield 2.* x |] List comprehensions are the part of a greater family of language constructs called computation expressions.
x.hash: x.object_id: Windows PowerShell x.ToString() x.Clone() x.Equals(y) x.CompareTo(y) x.GetHashCode() OCaml Oo.copy x: x = y: Hashtbl.hash x: Oo.id x: F# string x or x.ToString() or sprintf "%O" x: sprintf "%A" x: x.Clone() x = y or x.Equals(y) compare x y or x.CompareTo(y) hash x or x.GetHashCode() COBOL —
COBOL uses the STRING statement to concatenate string variables. MATLAB and Octave use the syntax "[x y]" to concatenate x and y. Visual Basic and Visual Basic .NET can also use the "+" sign but at the risk of ambiguity if a string representing a number and a number are together. Microsoft Excel allows both "&" and the function "=CONCATENATE(X,Y)".
Number End Sub Public Property Get Number As Long Number = mlngNumber End Property Public Property Get Description As String Description = mstrDescription End Property [ 12 ] Debug.Assert condition
However, since x is initialized to 0 and the value of x is never changed in the loop, the loop will never end (infinite loop). int x = 0 ; while ( x != 3 ) { // code that doesn't change x } The while loop below will execute the code in the loop 5 times.
When a statement in one iteration of a loop depends in some way on a statement in a different iteration of the same loop, a loop-carried dependence exists. [1] [2] [3] However, if a statement in one iteration of a loop depends only on a statement in the same iteration of the loop, this creates a loop independent dependence. [1] [2] [3]