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Function for macros (Switch case)

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What is the function for this macros below? What's the advantage for this?

Code: 
#define MYCASE(_item,_id) \ 
   case _id: \ 
     _item##_##_id=_id;\ 
   break 

  switch(x) { 
      MYCASE(widget,23); 
  }

How can we add another..
- MYCASE(widget,24);
- MYCASE(widget,35);
- MYCASE(high,168);

and can we add more case in one MYCASE? Can you please rewrite the program and show it?

Thank You.

ThanK You
 

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