PL/SQL sum of 2 numbers

-
program
---------------------------------------------------------------------------------------------

declare
a number:=10;
b number:=20;
c number;
begin
c:=a+b;
dbms_output.put_line('Sum is' ||c);
end;
/

Run in sql developer::----------------


                                               (Click on the photo to zoom in)

if  it is showing procedure is created but not showing any output,run the following commands
--------------------------------------------------------------------------
set serveroutput on;

 Then again run
-----------------------------------------------------------------------
declare
a number:=10;
b number:=20;
c number;
begin
c:=a+b;
dbms_output.put_line('Sum is' ||c);
end;
/

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