How to find the number of elements in a set? CPLEX OPL

Question

Lets say I have a set:

{int} A ={1,2,3,4};

How can I get the number of elements in this set in CPLEX?

Thanks in advance!

Answer 1

{int} A ={1,2,3,4};

int n=card(A);

execute
{
  writeln(n);
}

gives

4