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

In Icon, you can do

if month = (4|6|9|11) then ...

You can also do

if a < b < c then ...

See also

• Wikipedia: Icon (programming language)