create or replace procedure gcd
IS
a number;
b number;
begin
a:=&a;
b:=&b;
while b!=0 loop
     if a>b then
             a:=a-b;
     else
             b:=b-a;
     end if;
  end loop;
 dbms_output.put_line('The gcd of a and b:'||a);
  end;
  /
  
  
  begin
  gcd;
  end;
  /

PL/SQL Online Compiler

Write, Run & Share PL/SQL code online using OneCompiler's Oracle PL/SQL online editor and compiler for free. It's one of the robust, feature-rich online editor and compiler for Oracle PL/SQL running on latest version 23c (23.3.0.0). Getting started with the OneCompiler's Oracle PL/SQL editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'PL/SQL' and start writing code to learn and test online without worrying about tedious process of installation.

About PL/SQL

PL/SQL is procedural extension for SQL created by Oracle. It is by default embedded into the Oracle Database. PL/SQL program units are compiled and stored inside the Oracle Database which results in optimal execution times as the PL/SQL and SQL run within the same server process.

Syntax help

Following is the syntax structure for the PL/SQL code blocks

DECLARE 
   <declarations section> 
BEGIN 
   <executable command(s)>
EXCEPTION 
   <exception handling> 
END;

Example

DECLARE 
   message  varchar2(100):= 'Hello, World!'; 
BEGIN 
   dbms_output.put_line(message); 
END; 
/

Named procedures

CREATE OR REPLACE FUNCTION 
hello_user
   (user_name IN VARCHAR2) 
    RETURN VARCHAR2
IS
BEGIN
   RETURN 'Hello ' || user_name;
END hello_user;
/

BEGIN
   dbms_output.put_line(hello_user('Peter'));
END;
/

Exception handling

BEGIN
  DBMS_OUTPUT.put_line (1/0);
EXCEPTION
  WHEN OTHERS
  THEN
    DBMS_OUTPUT.put_line ('error is: ' || SQLERRM);
END;