String to Integer (atoi)

String to Integer (atoi)

int myAtoi(string str) {    int result = 0;    int sign = 1;    int i = str.find_first_not_of(' ');    for(i; i<str.size(); i++)    {        if(0 == result)        {            if('+' == str[i] || '-' == str[i])            {                sign = ('-' == str[i]) ? -1 : 1;                continue;            }        }        if(('0' <= str[i]) && (str[i] <= '9'))        {            result = result*10 + (str[i] - '0');        }else        {            printf("str format error !\n");            return 0;        }    }    return sign*result;}