Detect months with 31 days

Question

Is there an analogous form of the following code:

if(month == 4,6,9,11)
{
  do something;
}

Or must it be:

if(month == 4 ||         


        

Answer 1

if( 0x0A50 & (1<

dude, this is ridiculous. (month==4||month==6||month==9||month==11) is perfectly ok.