CSC111 Homework 4 Solutions 2014

--D. Thiebaut (talk) 12:33, 6 March 2014 (EST)

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Problem 1

Version 1

#hw4a
#Nicole Wong (bw)
#Anna Render (bp)
#(slightly edited by D. Thiebaut)
#
# Rock, Paper, Scissors game
# The program will stop only once the difference in score between computer and human players is 3
# The program prompts the user if the input is not one of 'P', 'R', or 'S'.
# The program will accept valid letters in lower or upper case, and with extra spaces before or after the letter.
# The program will indicate the winner of each round.
# The program will stop and output a final message at the end, when the difference in score is 3, 
# pointing out who the winner is.


#define variables
from random import choice
from random import seed
seed()

# constant values used in game
OPTIONS = ['R', 'P', 'S']

# counters for score
computerScore = 0
humanScore = 0
difference = 0

#--- while the difference between the human score and computer score is less than 3---
while difference < 3:
    
    computer = choice( OPTIONS )
    human = input( "What is your play? (R, P, S) " ).upper().strip()

    #--- keep prompting as long as  invalid input ---
    while human != 'P' and human != 'S' and human != 'R':
        human = input( "I didn't get that.  Please reenter: " ).upper().strip()
   
    #--- feedback to user ---
    print( "You have played: ", human.upper() )
    print( "The computer has chosen: ", computer )

    if ( computer == 'R' and human == 'P' ) \
       or ( computer == 'P' and human == 'S' ) \
       or ( computer == 'S' and human == 'R' ) :
        print( "Whatever, you win this round." )
        print()
        humanScore = humanScore + 1
        difference = abs(humanScore - computerScore)
        
    elif ( computer == 'R' and human == 'S' ) \
       or ( computer == 'P' and human == 'R' ) \
       or ( computer == 'S' and human == 'P' ) :
        print( "Haha, I win this round!" )
        print()
        computerScore = computerScore + 1
        difference = abs(humanScore - computerScore)
    else:
        print( "It's a tie!" )
        print()
        difference = abs(humanScore - computerScore)


#--- once the difference between the human and computer score is 3 ---
#--- print winner ----
if  computerScore > humanScore:
    print( "You lose the game!  I am sorry, but you are no match for me!" )
else:
    print( "Congrats, you win the game!" )

# (Note: there can't be a tie because the main loop repeats until difference of 3)