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c++bitset

My VS 2022 doesn't handle over than 32 bit bitset

I am trying to convert 45 bit binary number into a hex number but when compiling, I get overflow error, but when applying the code on online C++ compiler, it works. My platform is X64. Any help please.

int main()
{
    stringstream ss;
    string binary_str("111000000100010010100000110101001000100011000");
    bitset<45> n(binary_str);

    string f;
    ss << hex << n.to_ulong() << endl;  // error happens here 
    f = ss.str();
    cout << f;
    return 0;
}

When compile this code above on online C++ compiler I get a correct result which is OX1c08941a9118.

Solution

  • unsigned long is 32bit with MSVC. Also when compiling for x64. You need unsigned long long to get a 64bit integer, so in this case you can use to_ullong:

    ss << hex << n.to_ullong() << endl;