Structures and bit fields

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struct abc
{
int d;
int m;
int y;
}date;
if i use bit fields and suppose 33 bits are taking both date.d and date.m together
and date.m taking 16 bit than a new block of 32 bit memory created for storing 1 bit of date.d and date.m than did compiler will allocates remaing memory to date.y

What I have tried:

i have no idea wheter compiler allocates memory or not

Posted 11-Nov-17 15:08pm

keshav desai

Updated 11-Nov-17 18:04pm

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Peter_in_2780 · Answer 1 · 2017-11-11T18:04:00

When you use bit fields in a struct, you get to specify the width of each field, but the compiler is free to arrange them in "storage units" as it sees fit. Different compilers will behave differently, but most will try to be "reasonable", so that things like machine registers and I/O device registers are mapped more or less intuitively.