A procedure to Reverse a String in PL/SQL

Question

I just started learning PL/SQL and I\'m not sure how to create a procedure. The logic seems about right but I think there\'s some syntactical mistake in the first line. Here

Answer 1

Another solution reverse string minimizing loop count

DECLARE
v_str     VARCHAR2(100) DEFAULT 'MYSTRING';
v_len     NUMBER;
v_left    VARCHAR2(100);
v_right   VARCHAR2(100);
BEGIN
    v_len := LENGTH(v_str)/2;
    FOR rec IN 1..v_len 
    LOOP
      v_left := substr(v_str,rec,1) || v_left;
      IF rec * 2 <= LENGTH(v_str) THEN
        v_right := v_right || substr(v_str,-rec,1);
      END IF;
    END LOOP;
    v_str := v_right || v_left;
    dbms_output.put_line(v_str);
END;