nested loops in Lua

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Lua programming language allows to use one loop inside another loop. Following section shows few examples to illustrate the concept.

Syntax:

The syntax for a nested for loop statement in Lua is as follows:

for init,max/min value, increment
do
   for init,max/min value, increment
   do
      statement(s)
   end
   statement(s)
end

The syntax for a nested while loop statement in Lua programming language is as follows:

while(condition)
do
   while(condition)
   do
      statement(s)
   end
   statement(s)
end

The syntax for a nested repeat...until loop statement in Lua programming language is as follows:

repeat
   statement(s)
   repeat
      statement(s)
   until( condition )
until( condition )

A final note on loop nesting is that you can put any type of loop inside of any other type of loop. For example, a for loop can be inside a while loop or vice versa.

Example:

The following program uses a nested for loop:

j =2
for i=2,10 do
   for j=2,(i/j) , 2 do
      if(not(i%j)) 
      then
         break 
      end
      if(j > (i/j))then
         print("Value of i is",i)
      end
   end
end
   

When you build and run the above code, it produces the following result.

Value of i is	8
Value of i is	9
Value of i is	10


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