Binary String in to Integer in c++

[MukeshZ]

hi

I want convert Binary String to intger Format in c++.
like "00000100" should give me as "04" or "4"
could anyone suggest me the solution for it.

thanks
Mukesh:)

[vijayan121]

construct a bitset using the string and then convert it to a ulong.

#include <iostream>
#include <string>
#include <bitset>
#include <limits>
using namespace std ;

int main()
{
  string str = "00000100" ;
  cout << bitset<numeric_limits<unsigned long>::digits>(str).to_ulong() 
         << '\n' ;
}