VARIABLE v_bind1 VARCHAR2(10); -- no block section no nothing, just a bind variable declaration
EXEC :v_bind1 := 'hacker'; -- this is how you initialize the variable using the command EXEC (Execute)
SET SERVEROUTPUT ON;
BEGIN
    :v_bind1 := 'cracker'; -- second way of initialize
END;
/
-- note the ":"
-- Now let's display the bind variable value. In 3 different ways:

-- 1. DBMS_OUTPUT package
BEGIN
    :v_bind1 := 'cracker';
    DBMS_OUTPUT.PUT_LINE(:v_bind1);
END;

-- 2. Print command
PRINT :v_bind1; -- as a single command and also no blocks are needed

-- 3. Using AUTOPROINT
SET AUTOPRINT ON; - will print automatic AT initialization