SQL> DECLARE
  2      CURSOR CUR(PAR IN NUMBER)
  3        IS
  4          SELECT  1
  5            FROM  DUAL
  6            WHERE PAR > 0;
  7      V_N NUMBER := 10;
  8      V_RES NUMBER;
  9  BEGIN
 10      OPEN CUR(V_N);
 11      FETCH CUR
 12        INTO V_RES;
 13  DBMS_OUTPUT.PUT_LINE('V_N := ' || V_N);
 14  END;
 15  /
V_N := 10

PL/SQL procedure successfully completed.

SQL> DECLARE
  2      CURSOR CUR(PAR OUT NUMBER)
  3        IS
  4          SELECT  1
  5            FROM  DUAL
  6            WHERE PAR > 0;
  7      V_N NUMBER := 10;
  8      V_RES NUMBER;
  9  BEGIN
 10      OPEN CUR(V_N);
 11      FETCH CUR
 12        INTO V_RES;
 13  DBMS_OUTPUT.PUT_LINE('V_N := ' || V_N);
 14  END;
 15  /
V_N :=

PL/SQL procedure successfully completed.

SQL>