Cannot write the recursive function in PL/SQL

I'm down to the following without interest in PL/SQL script:

Set serveroutput on;

Set feedback off;

DECLARE

recursion_counter NUMBER: = 0;

function countNum (OUT int counter) return a Boolean value is

Start

dbms_output.put_line (Counter);

If counter > 10 then

Returns true;

on the other

counter: = counter + 1;

countNum (counter);

end if;

end countNum;

BEGIN

dbms_output.put_line (case when countNum (recursion_counter) then end if 'false' to 'true');

END;

I get the following error:

PLS-00221: 'COUNTNUM' is not a procedure or is not defined

and I would really like to know why. The error refers to this line:

countNum (counter);

DECLARE

recursion_counter NUMBER: = 0;

function countNum (int counter) return a Boolean value is

Start

dbms_output.put_line (Counter);

If counter > 10 then

Returns true;

on the other

Return countNum (counter + 1);

end if;

end countNum;

BEGIN

dbms_output.put_line (case when countNum (recursion_counter) then end if 'false' to 'true');

END;

true

SQL >

SY.

Tags: Database

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XMLSERIALIZE(DOCUMENTXMLELEMEN
--------------------------------------------------------------------------------

  
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```

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