×Ö·û´®×ªunsigned intº¯Êý-CÓïÑÔʵÏÖ

unsigned string_to_unsigned(char *s)
{
 unsigned result = 0;
 for (int i = strlen(s) - 1; i >= 0; --i){
  unsigned temp = 0;
  int k = strlen(s) - i - 1;
  if (isdigit(s[i])){
   temp = s[i] - '0';
   while (k--){
    temp *= 10;
   }
   result += temp;
  }
  else{
   break;
  }
 }
 return result;
}