How to find sum in oracle pl SQL

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Hi,
I am doing a find average code in pl sql but getting error.
Below i am giving tried code with error.

C#

DECLARE
   type namearray IS VARRAY(5) OF VARCHAR2(10);
   type grade IS VARRAY(5) OF INTEGER;
   names namearray;
   marks grade;
   total integer;
   sum integer := 0;
BEGIN
   names := namearray('Kavita', 'Pritam', 'Ayan', 'Rishav', 'Aziz');
   marks := grade(98, 97, 78, 87, 92);
   total := names.count;
   dbms_output.put_line('Total '|| total || ' Students');
   FOR i in 1 .. total LOOP
sum:= sum + marks(i);
dbms_output.put_line(marks(i));
  END LOOP;
dbms_output.put_line(sum / total);
END;

Error
---------------------

C#

ORA-06550: line 14, column 11:
PLS-00103: Encountered the symbol "+" when expecting one of the following:

   (
The symbol "(" was substituted for "+" to continue.
ORA-06550: line 14, column 21:
PLS-00103: Encountered the symbol ";" when expecting one of the following:

   . ( ) * % & - + / at mod remainder rem  ||
The symbol ")" was substituted for ";" to continue.
ORA-06550: line 17, column 26:
PLS-00103: Encountered the symbol "/" when expecting one of the following:

   (

What I have tried:

...................................................................................................

Posted 31-Oct-16 8:12am

Abinashi.btech

Updated 31-Oct-16 9:17am

Sean Ewington

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Wendelius · Answer 1 · 2016-10-31T09:17:00

The problem is that sum is a reserved word (see Summation - Wikipedia[^]).

Try to change the variable name. For example mysum:

SQL

DECLARE
   type namearray IS VARRAY(5) OF VARCHAR2(10);
   type grade IS VARRAY(5) OF INTEGER;
   names namearray;
   marks grade;
   total integer;
   mysum integer := 0;
BEGIN
   names := namearray('Kavita', 'Pritam', 'Ayan', 'Rishav', 'Aziz');
   marks := grade(98, 97, 78, 87, 92);
   total := names.count;
   dbms_output.put_line('Total '|| total || ' Students');
   FOR i in 1 .. total LOOP
      mysum := mysum + marks(i);
      dbms_output.put_line(marks(i));
  END LOOP;
dbms_output.put_line(mysum / total);
END;
/