c++ - struct size not as expected when using bit fields -

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this question has answer here:

with below code:

struct s { unsigned char b1 : 3; int i; };

i can deduce char b1 of 1 byte , using 3 bits of , int 4 bytes when try print out size of s, 8 bytes instead of 5 bytes(1 char+4 int) expected , not understanding obvious. can explain why size of s 8 bytes?


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