C++ Explain Formula level

[Obito]

Greetings OTLanders can someone explain in math this formula and how it works?

    static uint64_t getExpForLevel(int32_t level)
    {
        int64_t x = level;
    return ((50*x/3 - 100)*x + 850/3)*x - 200;
       
    }

And how to edit it to reach the maximum level to 1300 for example because the level stuck at 638 with 12,999,891 exprience


Thanks in advance!

 

[Alpha]

The formula is on Tibia Wiki
See these links:

Experience Table (https://tibia.fandom.com/wiki/Experience_Table)
Experience Formula (https://tibia.fandom.com/wiki/Experience_Formula)

 

[Obito]

The formula is on Tibia Wiki
See these links:

Experience Table (https://tibia.fandom.com/wiki/Experience_Table)
Experience Formula (https://tibia.fandom.com/wiki/Experience_Formula)

is there's some way to make the max level 1300 in c++? because in my server the max level 638

 

[Alpha]

is there's some way to make the max level 1300 in c++? because in my server the max level 638

The function works fine, the issue lies elsewhere in your source code. See: C++ Shell (http://cpp.sh/3t4n6l)

 

[Infernum]

Not sure why it works in cpp.sh, probably some weird optimizations, but your formula for some reason doesn't use unsigned long long literals for integer calculation. The max xp you can have is 4,294,967,295 which is why you're only able to get up to 638, if you look at @Alpha's code snippet you can see after 638 you go past that value up to 4,307,967,187 at level 639, but it will overflow and cause you to not gain levels anymore.
Look at the default TFS calculation:

static uint64_t getExpForLevel(int32_t lv) {
    lv--;
    return ((50ULL * lv * lv * lv) - (150ULL * lv * lv) + (400ULL * lv)) / 3ULL;
}

By using the ULL literal, it converts the integer on the left to uint64_t, allowing the following calculation to result in that data type instead of the default int type (usually int32_t).

You should just be able to return 0 if lv is > 1300 as well to make that the max level.