Some msb bit extraction

msb.c

#include <stdio.h>

#define extract_msb(val, size)				\
     val >> ((size/2) * 4);				\
     
int main()
{
     int i = 0xffff;
     short j = extract_msb(i,4)
     printf("\n %d, %d", i, j);
     return 0;
}