Struct - Explain the output:

Question

I have the following C code.

struct values{
  int a:3;
  int b:3;
  int c:2;
};

void main(){
  struct values v={2,-6,5};
  printf(\"%d %d %d\",v.a,v.b,v.c);         


        

Answer 1

-6 exceeds the range of a 3-bit signed int. Therefore you're observing an artifact of undefined implementation-defined behaviour (in practice, the most-significant bits of your value are being thrown away).