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