Discussion
What is the output of this program?
void main()
{
struct bitfields {
int bits_1: 2;
int bits_2: 9;
int bits_3: 6;
int bits_4: 1;
}bit;
printf("%d", sizeof(bit));
}
Answer: B
Correct answer: 3
The bit-fields total \(2 + 9 + 6 + 1 = 18\) bits. Rounded up to whole bytes that is 3 under the packing this question assumes. (In practice most compilers align bit-fields to their underlying type and would report 4, which is why bit-field layout is implementation-defined and not portable.)
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