Pragma EXECPTION_INIT and its usage ?

The PRAGMA EXECPTION_INIT tells the complier to associate an exception with an oracle error. To get an error message of a specific oracle error.

 

     e.g. PRAGMA EXCEPTION_INIT (exception name, oracle error number)

 

Pragma exception_init Allow you to handle the Oracle predefined message by you'r own message. means you can instruct compiler toassociatethe specific message to oracle predefined message at compile time.This way you Improve the Readbility of your program and handle it accoding to your own way.
It should be declare at the DECLARE section.
example
declare
salary number;
FOUND_NOTHING exception;
Pragma exception_init(FOUND_NOTHING 100);
begin
select sal in to salaryfrom emp where ename ='ANURAG';
dbms_output.put_line(salary);
exception
WHEN FOUND_NOTHING THEN
dbms_output.put_line(SQLERRM);
end;