C- Size of structure when bit field is used and how it is stored in memory

Question

void main()
{
  struct bitfield
  {
    signed int a :3;
    unsigned int b :13;
    unsigned int c :1;
  };

  struct bitfield bit1 = { 2, 14, 1 };
  clrscr();
  pr         


        

Answer 1

How bit-field is stored in memory is implementation dependent.

One possible reason is, the bit-field which has 17 bits, should hold at least 3 bytes, but the compiler choose to pad it to 4 bytes.

Again, almost everything about bit-field is implementation dependent, including the size of them and memory layout.

Last, don't use void main, always stay with int main