Решение задачи String 24

#include <bits/stdc++.h>

using namespace std;

int main()
{
    int res = 0;
    string s;
    cin >> s;
    reverse(s.begin(), s.end());
    for(int i = s.size() - 1; i >= 0; --i)
        if(s[i] == '1')
            res+=pow(2, i);
    cout << res;
    return 0;
}

# -*- coding: utf-8 -*-
import random

def RndBinary():
    N = random.randrange(1,11)
    return ''.join(random.choice('01') for _ in range(N))

for i in range(0,5):
    s_binary = RndBinary()
    print()
    print(s_binary, "=" ,int(s_binary, 2))
    decimal = 0
    for digit in s_binary:
        decimal = decimal*2 + int(digit)
    print(s_binary, "=" ,decimal)
									

program String24;
var
  i:integer;
  S:string;
  rez:real;
begin
 Write('S:');
 Readln (S);
 Rez:=0;
 
 for i:=0 to Length(S)-1 do
   if (ord(S[length(s)-i]) = 49) then rez:=rez+exp(ln(2)*i);
 
 Writeln(trunc(Rez));
end.