Pizza Cost Per Inch Calculator

# pizza_cpi_calc.py
#   This program calculates the cost per square inch of a circular pizza,
#   given its diameter and price. The formula for area is A = Pi X radius^2.
# by: Scott Gordon

import math


# Create a function to calculate the area of a pizza.
def area_of_pizza(radius):
    area = math.pi * radius**2
    return area


# Create a function to calculate the cost per square inch of a pizza.
def cost_psi_pizza(price, diameter):
    radius = diameter / 2
    pizza_area = area_of_pizza(radius)
    cost_psi = price / pizza_area
    return cost_psi


# Run both functions to demonstate their output
def main():
    # Get user input for pizza diameter and price.
    pizza_diameter = int(
        input("What is the diameter of your pizza in inches? "))
    pizza_price = float(input("How much did the pizza cost? "))
    print(
        f"Your cost per square inch of your pizza is ${cost_psi_pizza(pizza_price, pizza_diameter):.2f}")


main()