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Output in C

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What is the output of following program?
main ( )
{
union a
  {
    int i;
    char ch[z];
  }
union a,u;
u∙i=256
  printf (%d%d%d,u∙i,u∙ch[0],u∙ch[1] ); 
}

  1.  255 1 0
  2.   256 0 1
    Explanation:
    In union all elements refer to the same slot of memory. Thus in ▁(union a) if 2 bytes say 4501 & 4502 are allocated to ▁(int i) then ch[0] refers to 4501 & ch[1], to 4502.
    image:n71.PNG
  3.  256 1 0
  4.  255 0 1

How are they deciding u.ch[0] = 0  or u.ch[1] =1 ????

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