The size of basic data types

ID:51269 · 發表于 2014-11-11 00:29

This table gives the size and natural alignment of the basic data types in ARM C or C++.

Type	Size in bits	Natural alignment in bytes
char	8	1 (byte-aligned)
short	16	2 (halfword-aligned)
int	32	4 (word-aligned)
long	32	4 (word-aligned)
long long	64	8 (doubleword-aligned)
float	32	4 (word-aligned)
double	64	8 (doubleword-aligned)
long double	64	8 (doubleword-aligned)
All pointers	32	4 (word-aligned)
bool (C++ only)	8	1 (byte-aligned)
_Bool (C only[1])	8	1 (byte-aligned)
wchar_t (C++ only)	16	2 (halfword-aligned)
[1] stdbool.h can be used to define the bool macro in C.

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