To find greater number without using of Logical and relational Operators

To find greater number without using of Logical & relational Operators

int maximum(int x, int y)
 {  
   int fNum[2],temp,num[2];
   num[0] = x;
   num[1] = y;  
   temp=fNum[ Fun4Sign(x - y)];  
   return( temp);
}

int Fun4Sign(int sgn)
{  
     int temp;  
     temp= unsigned(sgn) >>  (sizeof(int)*8-1);    return(temp);
}