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When structures are defined, the compiler is allowed to add paddings (spaces without actual data) so that members fall in address boundaries that are easier to access for the CPU.
For example, on a 32-bit CPU, 32-bit members should start at addresses that are multiple of 4 bytes in order to be efficiently accessed (read and written). The following s...
struct S {int16_t member1;int32_t member2;};The structure in memory of the above structure in a 32-bit architecture is (~ = padding):
+---------+---------+Content Under CC-BY-SA license What is a "packed" structure in C? - Stack Overflow
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