# if/else/elif
age = 18

if age >= 18:
    print ('is an adult')
elif age >= 12:
    print ("is a young adult")
elif age >= 3:
    print ('child')
else:
    print ('baby')
# ternary
if age >= 21:
    old_enough = True
else:
    old_enough = False


old_enough = True if age >= 21 else False

# while
while age < 50:
    print("not old enough, current age is " +str(age))
    age += 1