# types
# variables
# functions / methods
# classes

# TYPES

'hello world'    # string
"hello world"    # string
"59873"          # string
59873            # number / integer
59873.54         # number / float


"2" + "2"        # "44"
2 + 2            # 4


# VARIABLES

bar = 5
gaz = "5"

bar * 3          # 15
gaz + 'hi'       # 5hi

foo = "hello world 1"
print(foo)       # hello world 1
foo = 'hello world 2'
print(foo)       # hello world 2
foo2 = 'hello world 3'
print(foo)       # hello world 2
print(foo2)      # hello world 3


# FUNCTIONS

def do_nothing():
    print('ok')

def get_circumference(radius):
    pi = 3.14
    some_constant = radius + 2
    another_constant = radius + 9
    circumference = 2 * radius * pi * some_constant * another_constant
    return circumference

radius1 = 8
radius2 = 9
radius3 = 11
radius4 = 14

circumference1 = get_circumference(radius1) # get_circumference is a function that takes 1 argument and returns 1 thing
circumference2 = get_circumference(radius2)
circumference3 = get_circumference(radius3)
circumference4 = get_circumference(radius4)

do_nothing()                                # do_nothing is a function that takes 0 arguments and returns 0 things

print('hi')                                 # print is a function that takes 1 argument and returns 0 things