How do I add indefinite scaling?

[Duomax]

So basically, I want to make a variable {extra} a number between 0 and the amount of levels a player/100 has, like this:
Level 0-100- between 0 and 1
100-200- between 0 and 2
200-300- between 0 and 3
and so on, with a 5% chance of even activating, or a 5% chance for it to be not 0, and equal chance to be the rest, every time a player mines a block.
I have no idea how to make this without making the skript for every single scale, is it possible? if so, how do I do this?

 

[Merrical]

So just to be clear, you just want an easy way to calculate {extra}? if so, this is what I'm thinking:

function getExtra(lvl:integer) :: integer:
    set {_level} to round(({_lvl} / 100) + 0.5)
    set {extra} to random integer between 0 and {_level}
    return {extra}

 

[Duomax]

thanks! it works!
btw, can you tell be, what does the ":: integer:" do?

 

[Shroob]

thanks! it works!
btw, can you tell be, what does the ":: integer:" do?

lets you return an integer

 

[Merrical]

I'm glad!