while loop in Lua

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A while loop statement in Lua programming language repeatedly executes a target statement as long as a given condition is true.

Syntax:

The syntax of a while loop in Lua programming language is:

while(condition)
do
   statement(s)
end

Here, statement(s) may be a single statement or a block of statements. The condition may be any expression, and true is any nonzero value. The loop iterates while the condition is true.

When the condition becomes false, program control passes to the line immediately following the loop.

Flow Diagram:

while loop in Lua

Here, key point of the while loop is that the loop might not ever run. When the condition is tested and the result is false, the loop body will be skipped and the first statement after the while loop will be executed.

Example:

a=10
while( a < 20 )
do
   print("value of a:", a)
   a = a+1
end

When the above code is built and executed, it produces the following result:

value of a:	10
value of a:	11
value of a:	12
value of a:	13
value of a:	14
value of a:	15
value of a:	16
value of a:	17
value of a:	18
value of a:	19


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