Prab at 13:30, 18 March 2025

2025-03-18T13:30:09Z

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'''While''' is a keyword in many [[programming languages]] that is used to create a [[control flow]] structure known as a [[loop]]. The while loop is a fundamental concept in [[computer programming]], and is used to repeatedly execute a block of code as long as a certain condition is true.

== Syntax ==
The syntax of the while loop varies between different programming languages, but the general structure is the same. A condition is specified in parentheses after the while keyword, and the code to be executed is enclosed in braces. For example, in the [[C (programming language)|C programming language]], the syntax would look like this:

```
while (condition) {
// code to be executed
}
```

== Usage ==
The while loop is used when a programmer wants to repeat a block of code an unknown number of times until a certain condition is met. This could be, for example, when reading data from a file until the end of the file is reached, or when asking for user input until valid input is received.

== Comparison with other loops ==
While loops are similar to [[for loop|for loops]] and [[do while loop|do while loops]]. The main difference is that the condition in a while loop is checked before the loop is executed, whereas in a do while loop, the condition is checked after the loop is executed. This means that a do while loop will always execute at least once, whereas a while loop may not execute at all if the condition is not met initially.

== See also ==
* [[Control flow]]
* [[Loop (computer science)|Loop]]
* [[For loop]]
* [[Do while loop]]

[[Category:Programming constructs]]
[[Category:Control flow]]
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Prab at 13:30, 18 March 2025

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