ZZULIOJ 1068: 二进制数，Java

1068: 二进制数

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
    Scanner cin = new Scanner(System.in);String s=cin.next();int result=0;for(int i=0;i<s.length();i++){
    char ch=s.charAt(i);result=result*2+ch-'0';}System.out.println(result);}
}