import math

# Function 1: Print "Hello"
def print_hello():
    print("Hello")

# Function 1.2: Returns the string "Hello"
# You need to call this function INSIDE a print statement
# to display "Hello" onto the terminal
def return_hello():
    return "Hello"

# Function 2: Area of a circle
def area_of_circle(r):
    return math.pi*(r**2)


# Function 3: Counting vowels in a SINGLE string
# Iterates through each character in the string word
def count_vowels(word):
    count = 0
    for i in word:
        if i.lower() == 'a' or i.lower() == 'e' or i.lower() == 'i' or i.lower() == 'o' or i.lower() == 'u': # True as long as one of these cases is True (you can also use if-elifs)
            count+=1    # Same as count = count + 1
    return count

# Function 4: Counting vowels in all strings in a list
# Makes repeated calls to the function count_vowels() but
# with a different string each time (because of the for-loop)
# Think of count_vowels() as a tool, if you give it a string
# it gives you the vowel count
def count_vowels_in_list(word_list):
    total_vowel_count = 0
    for word in word_list:
        single_word_vowel_count = count_vowels(word)      # word is a different string each time this function is called
        total_vowel_count+=single_word_vowel_count
    return total_vowel_count

#-----------------------------------------------------------------------------------------------------------------------------------------------
# You can only call your functions AFTER you've declared them
# If you try running these statements before the function has been written you will get an error!

print_hello()

print(return_hello())

print(area_of_circle(2))

print(count_vowels("Seattle"))

locations = ["Seattle", "Washington", "California", "Los Angeles"]
print(count_vowels_in_list(locations))