While
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[edit | edit source]
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, the syntax would look like this:
``` while (condition) {
// code to be executed
} ```
Usage[edit | edit source]
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[edit | edit source]
While loops are similar to for loops and 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[edit | edit source]
This programming related article is a stub. You can help WikiMD by expanding it.
Navigation: Wellness - Encyclopedia - Health topics - Disease Index - Drugs - World Directory - Gray's Anatomy - Keto diet - Recipes
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available.
Advertise on WikiMD
WikiMD is not a substitute for professional medical advice. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.
Translate this page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
Contributors: Prab R. Tumpati, MD