uva575 Skew Binary

水题，不解释！

#include<stdio.h>
#include<string.h>
int main()
{
    char s[100];
    while(scanf("%s",s) && s[0] != '0')
    {
        int temp = 2, sum = 0, k, i;
        k = strlen(s);
        for(i = k-1;i >= 0; i--)
        {
            sum += (s[i]-'0')*(temp-1);
            temp *= 2;
        }
        printf("%d\n",sum);
    }
    return 0;
}