Teach Your Kids to Code: A Parent-Friendly Guide to Python Programming by Bryson Payne

Author:Bryson Payne [Bryson Payne]
Language: eng
Format: epub, mobi, pdf
Tags: JUVENILE NONFICTION / Computers / Programming
ISBN: 9781593276812
Publisher: No Starch Press
Published: 2015-04-24T16:00:00+00:00

PingPongCalculator.py

➊ def convert_in2cm(inches): return inches * 2.54 def convert_lb2kg(pounds): return pounds / 2.2 ➋ height_in = int(input("Enter your height in inches: ")) weight_lb = int(input("Enter your weight in pounds: ")) ➌ height_cm = convert_in2cm(height_in) ➍ weight_kg = convert_lb2kg(weight_lb) ➎ ping_pong_tall = round(height_cm / 4) ➏ ping_pong_heavy = round(weight_kg * 1000 / 2.7) ➐ feet = height_in // 12 ➑ inch = height_in % 12 ➒ print("At", feet, "feet", inch, "inches tall, and", weight_lb, "pounds,") print("you measure", ping_pong_tall, "Ping-Pong balls tall, and ") print("you weigh the same as", ping_pong_heavy, "Ping-Pong balls!")

At ➊, we enter the two conversion formulas we developed. Both functions take an input parameter (inches and pounds), and each function returns a value. At ➋, we ask the user for a height and weight and store those values in height_in and weight_lb. At ➌, we call the convert_in2cm() function, passing height_in as the value we want to convert, and we store the converted answer in the variable height_cm. We perform another conversion calculation at ➍ using the convert_lb2kg() function to convert the person’s weight in pounds (abbreviated as lbs) into the equivalent in kilograms (kg).

The equation at ➎ does two things: first, it divides the user’s height in centimeters by 4 to find their height in Ping-Pong balls; then, it rounds that answer to the nearest whole number with the round() function and stores the result in the variable ping_pong_tall. At ➏, we do something similar by converting the user’s weight in kilograms to grams by multiplying by 1,000 and then dividing that amount by 2.7—the mass in grams of a standard Ping-Pong ball. That number is rounded to the nearest whole number and stored in the variable ping_pong_heavy.

At ➐ and ➑, we do just a little more math by figuring out the person’s height in feet and inches. As I mentioned previously, this is normally how we express our height in the United States, and it will be a nice finishing touch as well as a way for the person to check that they entered the correct information. The // operator does integer division, so 66 inches, or 5.5 feet, would result in just 5 being stored in the variable feet, and the % operator (modulo) would store the remainder, 6 inches. The print statements at ➒ print out the user’s height and weight, both in standard units and in Ping-Pong balls.

Here are the results from a few sample runs of the Ping-Pong calculator program, with Ping-Pong-ball measurements for my sons, Max and Alex, and me. (The only downside is that now my kids want to get 31,000 Ping-Pong balls.)

>>> ================================ RESTART ================================ >>> Enter your height in inches: 42 Enter your weight in pounds: 45 At 3 feet 6 inches tall, and 45 pounds, you measure 27 Ping-Pong balls tall, and you weigh the same as 7576 Ping-Pong balls! >>> ================================ RESTART ================================ >>> Enter your height in inches: 47 Enter your weight in pounds: 55 At 3 feet 11 inches tall, and 55 pounds, you measure

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