Eloquent way to iterate in Basic?

Let's say I want to implement a Prime Number Generator which returns a list of numbers, one at a time. I want to be able to run two or more generators simultaneously, so I can't use globals. I would imagine I'd need to implement three functions:

PNG_start.PNG(begin%, end%)
PNG_next(g.PNG)
PNG_get(g.PNG)

And use them like so:

g.PNG = PNG_start(1, 100)
While PNG_next(g)
	n = PNG_get(g)
	Print n
Wend

Three lines to start a loop seems excessive to me. Can anyone think of a more concise/eloquent way to write this? Or a better API?


Putting these statements on one line looks awful to me, mostly because the line doesn't start with a loop keyword so it's not immediately evident that a loop is beginning.

g.PNG = PNG_start(1, 100) : While PNG_next(g) : n = PNG_get(g)
	Print n
Wend

In C, you can use for(;;), which - although a little wordy - still looks good to me:

for( PNG g = PNG_start(1, 100); PNG_next(g); int n = PNG_get(g) ) {
	printf(n);
}

Any thoughts?