How to make this loop?

dimkasmir

I have multiple integer variables and several conditions that they have to meet. How would I make a loop that would go through all the possible values for the variables until they meet my conditions?

NogDog

That's a bit vague for me to make any specific suggestions. Sounds like you may be talking about some nested "for" loops, but I'm not really sure (plus that can lead to very inefficient code if there are many values to loop through with many levels of nesting).

bradgrafelman

In other words, can you show us some samples of these values and explain what conditions they must meet?

dimkasmir

Well the pogram calculates variables $W and $D based on $X and $n but that doesnt really matter. I want it find the values for $X and $n so that $X <= 100000 and $W == $D.

zingbats

I would assume the logic would go:

while(($x<100000) && ($W != $D)) {
 setnext $x and $W var
}

dimkasmir

I am not sure what setnext does. Could you please explain?

zingbats

Well I assume that you want your script to do this:

1) Calculate $W and $D based on $X and $n (We will call this MakeNew()😉
2) Test and see if the values of $X, $W and $D match your criteria
3) If yes, then keep the values, if not, generate new ones.

So the basic code would be:

MakeNew();
while(($x<100000) && ($W != $D)) {
   MakeNew();
}

dimkasmir

So what would MakeNew do?
Thanks.

zingbats

MakeNew() would calculate the values of $W and $D

dimkasmir

My main question is how to make the script generate new values for $X and $n. I want it to go through all the possible combo. For example:
$n $X
1 1
1 2
1 3
...
1 100,000
2 1
etc.

dimkasmir

Anyone?

laserlight

Have an outer loop cycle through all the possible values for $n, then have an inner loop that cycles through all the possible values of $X. In the inner loop body, print the combination (or rather, permutation).