Question

I have a strange problem. I have created a simple function to convert from decimal to binary. The argument is a int value that represents the number in decimal, and the function returns a bitset that represent the binary number.

The problem is that conversion for a binary number smaller than 10000000000000000000000000000000 (2,147,483,648 in decimal) works perfectly, but when the number to be converted is higher, the conversion doesn’t work properly. Where is the mistake???

Here I send you the function:

bitset<15000> Utilities::getDecToBin(int dec)
{
    bitset<15000> columnID; 
 int x;
    for(x=0;x<columnID.size();x++)
    {
       columnID[x]=dec%2;
       dec=dec/2;
    }

    return columnID;
}

Thanks in advance for all your help! 😀

Answer 1

You should use a long int, an array of long int or even a string as input to your method (depending on the source of your data and how you will call your function).