[Q] overflow negative price

[glogos13]

Is any way to overflow negative price ? because smth cost -15kk and when i try to overflow it normal then price i low but " - 60 k "

[mohm195]

Should be like this

//	SendKoemV2(0x18,"dbbww",NPC ID,Tax Rate,1,Item Index,Item Amount);
SendKoemV2(0x18,"dbbww",Npc[i].dwNpcID,85,1,9050,-23991);

[RunzelEier]

you can overflow/underflow negative prices in the same way you overflow prices > 0

[haha13337]

Originally Posted by RunzelEier

you can overflow/underflow negative prices in the same way you overflow prices > 0

How do I over/underflow an item?

[pleaX]

Integer overflow - Wikipedia, the free encyclopedia

[haha13337]

Originally Posted by pleaX

Integer overflow - Wikipedia, the free encyclopedia

Sorry, it didn't help me :8 Thanks anyways

[RunzelEier]

buy it 63883 times

new price 51559

Edit: wrote a small application just to calculate the overflow

source:

 Spoiler

PHP Code:

int calcOverflow(DWORD price)
{
    DWORD lowestPrice = 0xFFFFFFFF;
    DWORD timesbought;
    DWORD highestPrice = 0xFFFFFFFF;
    for(DWORD i = 1; i<=0xFFFF;i++){
        if(i*price < lowestPrice){
            lowestPrice = i*price;
            timesbought = i;
        }
    }
    return timesbought;
}


int main( int argc, const char* argv[] )
{
    int price;
    std::cout<<( "\treally really 1337 Overflow calculator by RunzelEier\n" );
    while(true){
        
        std::cout<<( "\nWrite Itemprice: " );
        std::cin>>price;
        int timesToBuy = calcOverflow(*((DWORD*)&price));
        std::cout << "Buy the Item: "<<timesToBuy <<" times" << std::endl;
        std::cout << "New Itemprice: " << timesToBuy*price << std::endl<< std::endl;
    }
} 


[haha13337]

Originally Posted by RunzelEier

buy it 63883 times

new price 51559

Edit: wrote a small application just to calculate the overflow

source:

 Spoiler

PHP Code:

int calcOverflow(DWORD price)
{
    DWORD lowestPrice = 0xFFFFFFFF;
    DWORD timesbought;
    DWORD highestPrice = 0xFFFFFFFF;
    for(DWORD i = 1; i<=0xFFFF;i++){
        if(i*price < lowestPrice){
            lowestPrice = i*price;
            timesbought = i;
        }
    }
    return timesbought;
}


int main( int argc, const char* argv[] )
{
    int price;
    std::cout<<( "\treally really 1337 Overflow calculator by RunzelEier\n" );
    while(true){
        
        std::cout<<( "\nWrite Itemprice: " );
        std::cin>>price;
        int timesToBuy = calcOverflow(*((DWORD*)&price));
        std::cout << "Buy the Item: "<<timesToBuy <<" times" << std::endl;
        std::cout << "New Itemprice: " << timesToBuy*price << std::endl<< std::endl;
    }
} 


Wooow! Don't know what to say, it worked. Thanks a lot! Your programs have helped me in many situations.

[katze123]

whats the sense of negative prices on items?

[pleaX]

I guess he thought he could underflow it.
But kal uses a WORD = unsigned short = lowest value is 0.