While

• while
• Description

While loops will loop continuously, and infinitely until the expression inside the parenthesis becomes false. Something must change the tested variable, or the while loop will never exit. This could be in your code, such as an incremented variable, or an external condition, such as testing a sensor.

• Syntax

while(expression){
   //statements
}

• Parameters

Expression：an outcome true or false

• • Example

var = 0;
while(var < 200){
//repeat one thing for 200 times
var++
}

[Return to Arduino Syntax Manual]