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In most computer programming languages, a while loop is a control flow statement that allows code to be executed repeatedly based on a given boolean condition. The while loop can be thought of as a repeating if statement. Computer programming (often shortened to programming or coding) is the process of writing, testing, and maintaining the source code of computer programs. ...
In computer science control flow (or alternatively, flow of control) refers to the order in which the individual statements or instructions of an imperative program are performed or executed. ...
A statement is the minimal unit of structuring in imperative programming languages. ...
In computer science, the Boolean datatype, sometimes called the logical datatype, is a primitive datatype having two values: one and zero (which are equivalent to true and false). ...
In computer science, conditional statements are a vital part of a programming language. ...
The while construct consists of a block of code and a condition. The condition is first evaluated - if the condition is true the code within the block is then executed. This repeats until the condition becomes false. Because while loops check the condition before the block is executed, the control structure is often also known as a pre-test loop. Compare with the do while loop, which tests the condition after the loop has executed. In logic and mathematics, a logical value, also called a truth value, is a value indicating to what extent a proposition is true. ...
False is the antonym of the adjective true. ...
In most computer programming languages, a do while loop, sometimes just called a do loop, is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. ...
Note that it is possible, and in some cases desirable, for the condition to always evaluate to true, creating an infinite loop. When such a loop is created intentionally, there is usually another control structure (such as a break statement) that controls termination of the loop. An infinite loop is a sequence of instructions in a computer program which loops endlessly. ...
For example, in the C programming language, the code fragment C is a general-purpose, procedural, imperative computer programming language developed in 1972 by Dennis Ritchie at the Bell Telephone Laboratories for use with the Unix operating system. ...
x = 0; while (x < 3) { x++; } first checks whether x is larger than 3, which it is not, so it increments x by 1. It then checks the condition again, and executes again, repeating this process until the variable x has the value 3. In computer science and mathematics, a variable (IPA pronunciation: ) (sometimes called a pronumeral) is a symbolic representation denoting a quantity or expression. ...
Demonstrating while loops
These while loops will calculate the factorial of a number: For factorial rings in mathematics, see unique factorisation domain. ...
'Initialize the variables Dim counter as Integer : counter = 5 Dim factorial as Long : factorial = 1 Do While counter > 0 factorial = factorial * counter 'Multiply counter = counter - 1 'Decrement Loop Print factorial 'Prints out the result. QBasic is an IDE and interpreter for a variant of the BASIC programming language which is based on QuickBasic. ...
Visual Basic (VB) is an event driven programming language and associated development environment from Microsoft for its COM programming model. ...
Dim counter as Integer = 5 Dim factorial as Integer = 1 While counter > 0 factorial = factorial * counter //Multiply counter = counter - 1 //Decrement Wend MsgBox Str( factorial ) // Prints out the result. REALbasic (RB) is an object-oriented dialect of the BASIC programming language developed and commercially marketed by REAL Software, Inc in Austin, Texas for Mac OS X, Microsoft Windows, and Linux. ...
unsigned int counter = 5; unsigned long factorial = 1; while (counter > 0) { factorial *= counter--; /*Multiply, then decrement.*/ } printf("%i", factorial); C is a general-purpose, procedural, imperative computer programming language developed in 1972 by Dennis Ritchie at the Bell Telephone Laboratories for use with the Unix operating system. ...
C++ (pronounced see plus plus, IPA: ) is a general-purpose, high-level programming language with low-level facilities. ...
my $counter = 5; my $factorial = 1; while ( $counter > 0 ) { $factorial *= $counter--; # Multiply, then decrement } print $factorial; Very similar to C and C++, but the while loop could also have been written on one line: Perl is a dynamic programming language created by Larry Wall and first released in 1987. ...
$factorial *= $counter-- while $counter > 0; While loops are frequently used for reading data line by line (as defined by the $/ line separator) from open filehandles: open IN, "<test.txt"; while ( <IN> ) { print; } close IN;
$counter = 5; $factorial = 1; while($counter > 0) { $factorial *= $counter--; // Multiply, then decrement. } echo $factorial; PHP (PHP:Hypertext Preprocessor) is a reflective programming language originally designed for producing dynamic web pages. ...
Tcl (Tool command language) set counter 5 set factorial 1 while {$counter > 0} { set factorial [expr $factorial * $counter] incr counter -1 } puts $factorial Tcl (originally from Tool Command Language, but nonetheless conventionally rendered as Tcl rather than TCL; and pronounced like tickle) is a scripting language created by John Ousterhout. ...
The code for the loop is the same for Java and Csharp: Java is an object-oriented applications programming language developed by Sun Microsystems in the early 1990s. ...
The title given to this article is incorrect due to technical limitations. ...
int counter = 5; long factorial = 1; while (counter > 0) factorial *= counter--; // Multiply, then decrement. For Java the result is printed as follows: System.out.println(factorial); The same in C# System.Console.WriteLine(factorial);
program Factorial var Counter, Factorial: integer; begin Counter := 5; Factorial := 1; while Counter > 0 do begin Factorial := Factorial * Counter; Counter := Counter - 1; end; Write(Factorial); end. Pascal is an imperative computer programming language, developed in 1970 by Niklaus Wirth as a language particularly suitable for structured programming. ...
Contrary to other languages, in Smalltalk a while loop is not a language construct but defined in the class BlockClosure as a method with one parameter, the body as a closure, using self as the condition. For other uses, see Small Talk (disambiguation). ...
For closure in computer science, see closure (computer science). ...
| count factorial | count := 5. factorial := 1. [ count > 0 ] whileTrue: [ factorial := factorial * (count := count - 1) ]
counter = 5 factorial = 1 while counter>0: factorial *= counter counter -= 1 print factorial Python is a high-level programming language first released by Guido van Rossum in 1991. ...
Dim $counter = 5, $factorial = 1 While $counter > 0 $factorial *= $counter $counter -= 1 WEnd MsgBox(0,"Factorial", $factorial) AutoIt official logo AutoIt is a freeware Microsoft Windows automation language. ...
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