Question

Intro to Programming and Logic (chapter 5):

Python 2 - Conditionals and Recursion:

Write a program that will simulate a roulette wheel. The pockets on a roulette wheel are different colors.

There are 36 pockets – numbered 0 to 35. Pocket 0 and 18 are green.

For pockets 1 – 8, the even numbers are black and the odd numbers are red.

For pockets 9 – 17, the even numbers are red and the odd numbers are black.

For pockets 19 – 27, the even numbers are black and the odd numbers are red.

For pockets 28 – 35, the even numbers are red and the odd numbers are black.

Have the program ask the user for a color. If the color is not “red”, “green”, or “black”- the program should display an error and the program should end. The program will then randomly generate a number from 0 to 35. It will then determine the color for that number. If the color of the randomly picked number and the color picked by the user match – display a message of congratulations. If they do not match, display an error message – along with the color of that pocket that was randomly selected.

Your program should have at least 2 functions. One should be the main. The other should be a function that picks a random number from 0 to 35, displays the number, determines from the rules above what the color that number is, and then returns the color. The color should be string – either “red”, “black”, or “green.

Grading:

Program compiles with no syntax errors: 12 points

The program does what it is supposed to do: 5 points

You have meaningful comments: 3 points

You should have a multiline comment at the top to describe what the program does.

You should have comments that describe what your functions do You should have comments in your program wherever else would be useful to the reader of your code.

Answer 1

## Start of the program ##

from __future__ import print_function

import random # for generating random number

'''

This program will simulate a roulette wheel. The pockets on a roulette wheel are different colors.

There are 36 pockets numbered 0 to 35. Pocket 0 and 18 are green.

For pockets 1 to 8, the even numbers are black and the odd numbers are red.

For pockets 9 to 17, the even numbers are red and the odd numbers are black.

For pockets 19 to 27, the even numbers are black and the odd numbers are red.

For pockets 28 to 35, the even numbers are red and the odd numbers are black.

To Play :

1. User will enter a color - black, green or red. If an invalid color is entered, the program will print an error and exit

2. If a valid color is entered, the program will generate a random number from 0 to 35 and the color assocaited with the random number generated

3. If the color entered by the user matches the generated color, the user win. Otherwise the user looses.

'''

# main method begins

def roulette():

# prompts the user to enter a color and store it

# NOTE : Please replace raw_input with input function if you're running this in Python3

userSelectedColor = raw_input("Enter a color (black, green or red) : ")

# if entered color is invalid, show error message

if userSelectedColor.lower() != "green" and userSelectedColor.lower() != "red" and userSelectedColor.lower() != "black":

print("Error : Please pick a color from black, green or red only")

# if entered color is valid, call play method to generate a color

else:

generatedColor = play()

# if entered color matches the generated color, print win message

if userSelectedColor.lower() == generatedColor:

print("Congrats you win")

# if entered color doesn't match the generated color, print message for loosing and the generated color

else:

print("Sorry! You loose. Color of the pocket is ", generatedColor)

'''

play method to generate a random number and the corresponding color.

returns the generated color

'''

def play():

# generates a random number between 0 and 35

pocket = random.randrange(0, 35)

# prints the random number generated

print("Random number is :", pocket)

# start of if condition to set the generated color according to the random number generated

if pocket == 0 or pocket == 18:

color = "green"

elif(pocket >= 1 and pocket <= 8):

if(pocket%2 == 0):

color = "black"

else:

color = "red"

elif(pocket >= 9 and pocket <= 17):

if(pocket%2 == 0):

color = "red"

else:

color = "black"

elif(pocket >= 19 and pocket <= 27):

if(pocket%2 == 0):

color = "black"

else:

color = "red"

elif(pocket >= 28 and pocket <= 35):

if(pocket%2 == 0):

color = "red"

else:

color = "black"

# returns the color

return color

'''

Calling the main method roulette

'''

roulette()

## End of the program ##

SCREENSHOTS :

In Python2

In Python3