-- Create a package specification
CREATE OR REPLACE PACKAGE pk1 AS
  PROCEDURE proc1(num1 IN NUMBER, num2 IN NUMBER, sum OUT NUMBER, avg OUT NUMBER, prod OUT NUMBER);
  PROCEDURE proc2(num IN NUMBER, sqrt_result OUT NUMBER);
  FUNCTION fn11(num IN NUMBER) RETURN BOOLEAN;
  FUNCTION fn22(num1 IN NUMBER, num2 IN NUMBER, num3 IN NUMBER) RETURN NUMBER;
END pk1;
/

-- Create a package body
CREATE OR REPLACE PACKAGE BODY pk1 AS
  PROCEDURE proc1(num1 IN NUMBER, num2 IN NUMBER, sum OUT NUMBER, avg OUT NUMBER, prod OUT NUMBER) IS
  BEGIN
    sum := num1 + num2;
    avg := (num1 + num2) / 2;
    prod := num1 * num2;
  END proc1;

  PROCEDURE proc2(num IN NUMBER, sqrt_result OUT NUMBER) IS
  BEGIN
    sqrt_result := SQRT(num);
  END proc2;

  FUNCTION fn11(num IN NUMBER) RETURN BOOLEAN IS
  BEGIN
    RETURN MOD(num, 2) = 0;
  END fn11;

  FUNCTION fn22(num1 IN NUMBER, num2 IN NUMBER, num3 IN NUMBER) RETURN NUMBER IS
  BEGIN
    RETURN num1 + num2 + num3;
  END fn22;
END pk1;
/

-- Example of using the package in a PL/SQL program
DECLARE
  num1 NUMBER := &num1;  -- Prompt for user input
  num2 NUMBER := &num2;  -- Prompt for user input
  num3 NUMBER := &num3;  -- Prompt for user input
  result_sum NUMBER;
  result_avg NUMBER;
  result_prod NUMBER;
  result_sqrt NUMBER;
  result_fn11 BOOLEAN;
  result_fn22 NUMBER;
BEGIN
  pk1.proc1(num1, num2, result_sum, result_avg, result_prod);
  pk1.proc2(num1, result_sqrt);
  result_fn11 := pk1.fn11(num1);
  result_fn22 := pk1.fn22(num1, num2, num3);

  DBMS_OUTPUT.PUT_LINE('Sum: ' || result_sum);
  DBMS_OUTPUT.PUT_LINE('Average: ' || result_avg);
  DBMS_OUTPUT.PUT_LINE('Product: ' || result_prod);
  DBMS_OUTPUT.PUT_LINE('Square Root: ' || result_sqrt);
  DBMS_OUTPUT.PUT_LINE('Is ' || num1 || ' even? ' || CASE WHEN result_fn11 THEN 'Yes' ELSE 'No' END);
  DBMS_OUTPUT.PUT_LINE('Sum of three numbers: ' || result_fn22);
END;
/