counter in while loop

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how could I create a variable that increase in every iteration in while loop in vop. something like this:

int x=0
while(…)
x += 1;

how could I define something like x in vop.
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Here's one way. The key thing is that if you attach to the suboutput, then your subinput will use the values from the previous iteration.

Attachments:
whileLoopVOP.hipnc (61.9 KB)

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thank you edward I got it
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