Conversion of character string to integer (unsigned long long type) and storing pointer in last character string
unsigned long long strtoull(const char *str, char **ptr, int base);
Returns the converted value if the partial character string could be converted. If it could not, 0 is returned.
If an overflow occurs, ULLONG_MAX is returned, and macro ERANGE is set to global variable errno.
This function is the same as strtol except that the type of the return value is of unsigned long long type.
This function cannot be used when the -lang=c option and -strict_std option are both specified.