# Program 2: Addition
def main():
    a = 10
    b = 20

    print("First number:", a)
    print("Second number:", b)

    result = a + b

    print("Sum is:", result)

main()

First number: 10
Second number: 20
Sum is: 30

# Program 3: Addition using input
def main():
    a = int(input("Enter first number: "))
    b = int(input("Enter second number: "))

    print("You entered:", a, b)

    result = a + b

    print("Total:", result)

main()

Enter first number:  1
Enter second number:  2


You entered: 1 2
Total: 3

# Program 4: Even or Odd
def main():
    num = int(input("Enter number: "))

    print("Checking number...")

    if num % 2 == 0:
        print("Even number")
    else:
        print("Odd number")

main()

Enter number:  2


Checking number...
Even number