Describe if-elif-else with proper example.

Example 1: if else python

# IF ELSE ELIF 

print('What is age?')
age = int(input('number:')) # user gives number as input
if age > 18:
    print('go ahead drive')
elif age == 18:
    print('come personaly for test')
else:
    print('still underage')

Example 2: if and elif

'''In this program, we input a number
check if the number is positive or
negative or zero and display
an appropriate message
This time we use nested if statement'''

num = float(input("Enter a number: "))
if num >= 0:
    if num == 0:
        print("Zero")
    else:
        print("Positive number")
else:
    print("Negative number")