Conversion of character string to integer (long long type)
long long atoll(const char *str);
Returns the converted value if the partial character string could be converted. If it could not, 0 is returned.
This function converts the first part of the character string indicated by str into a long long int type representation. atol is the same as "strtol (str, NULL, 10)".
This function cannot be used when the -lang=c option and -strict_std option are both specified.