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Compiler storage of data objects by natural byte alignment

C data types are aligned on specific byte boundaries, depending on their type.

By default, the compiler stores data objects by byte alignment as shown in the following table.

Table 5-9 Compiler storage of data objects by byte alignment

Type Bytes Alignment
char, bool, _Bool 1 Located at any byte address.
short, wchar_t 2 Located at any address that is evenly divisible by 2.

float, int, long, pointer

4 Located at an address that is evenly divisible by 4.

long long, double, long double

8 Located at an address that is evenly divisible by 8.
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