# Write a function that gets the radius of a circle,
# and displays and returns
# the approximation of the circle's area.
# Use 3.14 as the value for pi.


def compute_area(radius):
    pi = 3.14
    if radius < 0:
        return "radius cannot be negative"
    area = pi * (radius ** 2)
    print("area of a circle with radius", radius, "is", area)

    return area



# consider
# 1. where the functions are defined
# 2. where the functions are called
# 3. flow of the function calls