Unidata

6.4 NetCDF-4 Atomic Types

NetCDF-4 files support all of the atomic data types from netCDF-3, plus additional unsigned integer types, 64-bit integer types, and a string type.

Type	C #define	Bits
byte	NC_BYTE	8
unsigned byte	NC_UBYTE^	8
char	NC_CHAR	8
short	NC_SHORT	16
unsigned short	NC_USHORT^	16
int	NC_INT	32
unsigned int	NC_UINT^	32
unsigned long long	NC_UINT64^	64
long long	NC_INT64^	64
float	NC_FLOAT	32
double	NC_DOUBLE	64
char **	NC_STRING^	string length + 1

^This type was introduced in netCDF-4, and is not supported in netCDF classic or 64-bit offset format files, or in netCDF-4 files if they are created with the NC_CLASSIC_MODEL flags.