How is the itemchance calculated?

[hyperionb]

Hello,
I'm wondering right now how the itemchance is calculated.
The "itemchance" is set here with the array itemchance for each item, buildin, loottype etc... for example line 329.
https://github.com/R4Z0R49/DayZMod/blob/Release_1.7.6/SQF/dayz_code/config.cpp

Obviously the number set in itemchance for each item isn't the real itemchance. The real itemchance is calculated here:
https://github.com/R4Z0R49/DayZMod/blob/Release_1.7.6/SQF/dayz_code/init/loot_init.sqf

To be accurate it is between line 12 and 19.
here:

            _weighted = [];
            _j = 0;
            for "_l" from 0 to ((count _itemChances) - 1) do {
            _weight = round ((_itemChances select _l) * 100);
                for "_k" from 0 to _weight - 1 do {
                    _weighted set [_j + _k, _l];
                };
            _j = _j + _weight;

My Problem: I fail to understand what is calculated how etc. because I also only know a bit C++. The end result of the calculation seems to be _weighted which is also the real itemchance.
Please help.

regards