PLS-00103 during Oracle stored procedure: the sign '/' appears when the following is required :(

Oracle Stored Procedure mdash; PLS-00103: The symbol ldquo; rdquo; when the following is required :(

Oracle Stored Procedure mdash; PLS-00103: The symbol ldquo;/rdquo; when the following is required :(

Write a stored procedure in Oracle: the following error occurs,

PLS-00103: the sign '/' appears when you need the following :(

After a variety of Google Baidu, defining variables in the stored procedure does not allow the use of keywords, And I have defined the variable sum, resulting in errors.

The compiled code is as follows:

Create or replace procedure avg_sal (result out char)
Is
I number (5 );
Summ number (20 );
Countnum number (20 );
Begin
I: = 10;
While I <40 loop
I: = I + 10;
Select sum (salary), count (*) into summ countnum from emp where deptno = I;
Result: = summ/countnum;
End loop;
End;
/

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