Basic function definitions
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# define a function that takes two numbers, adds them, and returns the sum
# call that function to add 7 and 8 and then print the result
# using the variables below, call that function to add x and y, multiply the
# result by z and then print that result
x = 17
y = 6
z = 8
# call that function to add the second and fourth numbers in the list below
# and then print the result
nums = [16, 23, 41, 89]
# define a function that takes three numbers and returns the largest one,
# without using the built-in max function
# use that function to print the larger of x and y
# define a function that takes an integer and calls the use "poopy" (print to the screen)
# that many times
# call that function to call the user "poopy" 7 times
# define a function that takes a list of numbers and returns a new list containing the
# same numbers in reverse order (without using the built-in list reverse method)
# call that function to reverse the nums list above, then print the result