c++ string을 이용한 2진수에서 10진수 변환 프로그램

/*

made by hahahia

main.cpp */

#include <iostream>

#include <vector>

#include <cstdlib>

#include <cmath>

#include <iterator>

#include <algorithm>

#include <string>

 

using namespace std;

 

int main(){

        int result = 0;

        string str;

        cin >> str;

        int e=1;

        for(int i=str.length()-1; i>=0; i--)

        {

               for(int j=0; j<str.length()-i-1; j++)

                       e*=2;

               if(str[i] == '1')

                       result += e;

               e=1;

        }

        cout << result << endl;

        return 0;

}

---

출력 결과

0011

3

1001

9

1100

12