POJ1565 水题

#include <stdio.h>#include <string.h>int main(){char str[33];while(scanf("%s",str)==1&&strcmp(str,"0")){int len = strlen(str);int sum = 0;for(int i=0;i<len;i++){sum += (int)(str[i]-'0') * ((1<<len-i)-1);}printf("%d\n",sum);}return 0;}