Comparison of integer data types: FreeBASIC vs. C/C++ (using GCC)

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=TblComparisonCTypes
• Last revised: 2022-10-07

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	C int	C long long [int]	C long [int]	FB Long	FB LongInt	FB Integer
32bit win32	32	64	32 (ILP32)	32	64	32
32bit linux-x86	32	64	32 (ILP32)	32	64	32
64bit win64	32	64	32 (LLP64)	32	64	64
64bit linux-x86_64	32	64	64 (LP64)	32	64	64

Some public symbols (like namespaces, and user defined type member procedures) will have data type information encoded in to the public name (also known as name mangling or name decoration). Specific mapping of data types between FreeBASIC and gcc is required when linking fbc compiled object modules with gcc compiled object modules.

Target	fbc data type	c data type	bits
all	byte	signed char	8
all	ubyte	unsigned char	8
all	byte alias "char"	char	8
all	ubyte alias "char"	char	8
all	short	[signed] short [int]	16
all	ushort	unsigned short [int]	16
all	long	[signed] int	32
all	ulong	unsigned int	32
x86	integer	[signed] long [int]	32
x86	uinteger	unsigned long [int]	32
win64	long alias "long"	[signed] long [int]	32
win64	ulong alias "long"	unsigned long [int]	32
win64	integer	INTEGER	64
win64	uinteger	UINTEGER	64
linux-x86_64	integer	[signed] long [int]	64
linux-x86_64	uinteger	unsigned long [int]	64
all	longint	[signed] long long [int]	64
all	ulongint	unsigned long long [int]	64

See also

• Creating FB bindings for C libraries - How to translate C data types to FB

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