Thread: bit fields

Originally Posted by grumpy

It probably means the compiler is smart enough to pack b and c into one 32-bit word (which isn't possible if c is 3 bits, as 33 bits won't fit in a 32 bit word). a is in another 32 bit word. With 8-bit bytes, that means sizeof your struct yields 8.

Then why doesnt it do the same thing when only 1 bit is increased I mean why on increasing size with just one bit it straight away increases the total size by 4 bytes??