The TWC Programming Challenge

**fatsheep** · March 18, 2007, 08:58 PM

I've taken the liberty of making the first TWC programming challenge. Since I really have no idea how many entires to expect or the caliber of the programmers here, let's try something rather simple: a rock, paper, scissors game. It doesn't have to be fancy - just a text based menu with a computer to play against. Helow is my example (written in python). Good luck on your entries!

Code:

#!/usr/bin/python

## IMPORTS ##
import random

## CONSTANTS ##
ROCK = "ROCK"
SCISSORS = "SCISSORS"
PAPER = "PAPER"
QUIT = "QUIT"

DRAW = "DRAW"
WIN = "WIN"
LOSE = "LOSE"

PROMPT = "Choose (R)ock, (P)aper, or (Scissors): "

## DICTIONARIES AND LISTS ##
conv = { 'R' : ROCK, 'P' : PAPER, 'S' : SCISSORS, 'Q' : QUIT }
num_conv = { 1 : ROCK, 2 : PAPER, 3 : SCISSORS }
# human + computer 
score = { ROCK+PAPER: LOSE, ROCK+ROCK: DRAW, ROCK+SCISSORS: WIN,
	  PAPER+ROCK: WIN, PAPER+PAPER: DRAW, PAPER+SCISSORS: LOSE,
	  SCISSORS+ROCK: LOSE, SCISSORS+SCISSORS: DRAW, SCISSORS+PAPER: WIN }

### FUNCTONS ###

def print_records(humanW, compW):
	print "----- RECORDS -----"
	print "Human: %s - %s, Computer: %s - %s" % (humanW, compW, compW, humanW)
	print ""	

## VARIABLE DECLARATIONS ##
human = 0
humanW = 0
compW = 0
while True:
	try:
		human = conv[raw_input(PROMPT).upper()]
	except:
		print "Error: Invalid input!\n"
		continue

	if human == QUIT:
		break

	computer = num_conv[random.randint(1,3)]
	print "Human: %s\t" % human,
	print "Computer: %s\t" % computer,
	results = score[human+computer]
	
	
	if results == WIN:
		humanW += 1
		print "Human wins!"
	elif results == LOSE:
		compW += 1
		print "Computer wins!"
	else:
		print "Draw!"
	print_records(humanW, compW)

Some sample output:

Choose (R)ock, (P)aper, or (Scissors): r
Human: ROCK Computer: SCISSORS Human wins!
----- RECORDS -----
Human: 1 - 0, Computer: 0 - 1

Choose (R)ock, (P)aper, or (Scissors): p
Human: PAPER Computer: SCISSORS Computer wins!
----- RECORDS -----
Human: 1 - 1, Computer: 1 - 1

Choose (R)ock, (P)aper, or (Scissors): s
Human: SCISSORS Computer: ROCK Computer wins!
----- RECORDS -----
Human: 1 - 2, Computer: 2 - 1

Choose (R)ock, (P)aper, or (Scissors): s
Human: SCISSORS Computer: ROCK Computer wins!
----- RECORDS -----
Human: 1 - 3, Computer: 3 - 1

Choose (R)ock, (P)aper, or (Scissors):

**Lee1026** · March 18, 2007, 09:20 PM

Code:

#include <iostream>
#include <stdlib.h>
#include <stdio.h>
using namespace std;

int main()
{
	int player_win=0;
	int computer_win=0;
	
	char player_move;
	char computer_move;
	int random;
	do{
		cout << "Choose (R)ock, (P)aper, or (S)cissors): ";
		cin >> choice;
		random=rand()%3;
		if(random==0)
			computer_move='R';
		else if(random==1)
			computer_move='P';
		else if(random==2)
			computer_move='S';
		if( (player_move=='S' && computer_move=='R') ||
			(player_move=='R' && computer_move=='P') ||
			(player_move=='P' && computer_move=='S') )
			{
				computer_win++;
				cout << "Computer wins!" << endl;
				cout << "Human " << player_win<< "Computer " << computer_win << endl;
			}
		else if( (player_move=='R' && computer_move=='S') ||
			(player_move=='P' && computer_move=='R') ||
			(player_move=='S' && computer_move=='P') )
			{
				player_win++;
				cout << "Human wins!" << endl;
				cout << "Human " << player_win<< "Computer " << computer_win << endl;
			}
		else
		{
			cout << "TIED" << endl; 
			cout << "Human " << player_win<< "Computer " << computer_win << endl;
		}
	while(1);
	return 0;
}

**fatsheep** · March 20, 2007, 03:58 PM

Lee, you missed the ending bracket in your 'do' block and the compiler didn't recognize the variable 'choice'. I'm assuming you meant to use the integer 'player_move' instead so I substituted that in as well:

Code:

#include <iostream>
#include <stdlib.h>
#include <stdio.h>
using namespace std;

int main()
{
	int player_win=0;
	int computer_win=0;
	
	char player_move;
	char computer_move;
	int random;
	do 
	{
		cout << "Choose (R)ock, (P)aper, or (S)cissors): ";
		cin >> player_move;
		random=rand()%3;
		if(random==0)
			computer_move='R';
		else if(random==1)
			computer_move='P';
		else if(random==2)
			computer_move='S';
		if( (player_move=='S' && computer_move=='R') ||
			(player_move=='R' && computer_move=='P') ||
			(player_move=='P' && computer_move=='S') )
			{
				computer_win++;
				cout << "Computer wins!" << endl;
				cout << "Human " << player_win<< "Computer " << computer_win << endl;
			}
		else if( (player_move=='R' && computer_move=='S') ||
			(player_move=='P' && computer_move=='R') ||
			(player_move=='S' && computer_move=='P') )
			{
				player_win++;
				cout << "Human wins!" << endl;
				cout << "Human " << player_win<< "Computer " << computer_win << endl;
			}
		else
		{
			cout << "TIED" << endl; 
			cout << "Human " << player_win<< "Computer " << computer_win << endl;
		} 
	}
	while(1);
	return 0;
}

With the above code I got your program to compile however, the output isn't what you'd expect:

ubuntu@ubuntu:~/Desktop$ ./rps
Choose (R)ock, (P)aper, or (S)cissors): r
TIED
Human 0Computer 0
Choose (R)ock, (P)aper, or (S)cissors): p
TIED
Human 0Computer 0
Choose (R)ock, (P)aper, or (S)cissors): s
TIED
Human 0Computer 0
Choose (R)ock, (P)aper, or (S)cissors): p
TIED
Human 0Computer 0
Choose (R)ock, (P)aper, or (S)cissors): rp
TIED

---------------------------------------

Incinerate, you sure did miss a lot of semicolons

. Here's a few little reminders about C++:

In order to use std::cin and std::cout you have to include the library that contains them. You need this line at the beginning of your program

#include <iostream>
In order to refer to std::cin as cin and std::cout as cout you need to include the line

using namespace std;

. Otherwise the compiler has no idea what you're talking about.
Remember to enclose characters in single quotes. For example, instead of

if(input = a)

you need

if(input = 'a')

. The former will not compile.
If you need to have a command that spans multiple lines (such as the cout command that displays the "Choose..." prompt), you need to use backslashes at the end of each line you wish to continue into the next. Look at that command below to see how I've corrected it.
Last but not least, remember those semicolons! :-p I'm not sure what it was but I think you missed the last semicolon in each block of code.

I've fixed all the errors in your code, have a look:

Code:

#include <iostream>
using namespace std;

int main()
{

char input;
int comp;

cout << "Choose: \
         a. Rock \
	 b. Paper \
	 c. Scissors/n";

cin >> input;

comp = (rand() % 10) + 1;

if(input = 'a')
{
	cout << "You choose Rock,/n";

	if(comp = 1)
	{
	cout << "the computer choose rock./n";
	cout << "it's a tie!";
	}

	if(comp = 2)
	{
	cout << "the computer choose paper./n";
	cout << "sorry you lose.";
	}

	if(comp = 3)
	{
	cout << "the computer choose Scissors./n";
	cout << "you win!.";
	}
}


else if(input = 'b')
{
	cout << "You choose paper,/n";

	if(comp = 1)
	{
	cout << "the computer choose rock./n";
	cout << "you win!";
	}

	if(comp = 2)
	{
	cout << "the computer choose paper./n";
	cout << "it's a tie!";
	}

	if(comp = 3)
	{
	cout << "the computer choose Scissors./n";
	cout << "sorry you lose.";
	}
}

else
{
	cout << "You choose scissors,/n";

	if(comp = 1)
	{
	cout << "the computer choose rock./n";
	cout << "sorry you lsoe.";
	}

	if(comp = 2)
	{
	cout << "the computer choose paper./n";
	cout << "you win!";
	}

	if(comp = 3)
	{
	cout << "the computer choose Scissors./n";
	cout << "its a tie!.";
	}
}

}

Although the program now compiles, it only does one game and quits and the output isn't too pretty:

ubuntu@ubuntu:~/Desktop$ ./rps2
Choose: a. Rock b. Paper c. Scissors/na
You choose Rock,/nthe computer choose rock./nit's a tie!the computer choose paper./nsorry you lose.the computer choose Scissors./nyou win!.ubuntu@ubuntu:~/Desktop$ ./rps2
Choose: a. Rock b. Paper c. Scissors/nb
You choose Rock,/nthe computer choose rock./nit's a tie!the computer choose paper./nsorry you lose.the computer choose Scissors./nyou win!.ubuntu@ubuntu:~/Desktop$ ./rps2
Choose: a. Rock b. Paper c. Scissors/nc
You choose Rock,/nthe computer choose rock./nit's a tie!the computer choose paper./nsorry you lose.the computer choose Scissors./nyou win!.ubuntu@ubuntu:~/Desktop$

However, that shouldn't be too hard to fix. Good luck!

---------------------------------------

Erik, I must admit that I am completely unfamiliar with Lisp so this could be my fault but when I try to run your program with clisp I get this error:

ubuntu@ubuntu:~/Desktop$ clisp lisp
*** - EVAL: undefined function DEFINE

**Incinerate_IV** · March 18, 2007, 11:11 PM

Code:

int main()
{

char input;
int comp;

cout << "Choose:
         a. Rock
	 b. Paper
	 c. Scissors/n";

cin >> input;

comp = (rand() % 10) + 1;

if(input = a)
{
	cout << "You choose Rock,/n";

	if(comp = 1)
	{
	cout << "the computer choose rock./n";
	cout << "it's a tie!";
	}

	if(comp = 2)
	{
	cout << "the computer choose paper./n";
	cout << "sorry you lose."
	}

	if(comp = 3)
	{
	cout << "the computer choose Scissors./n";
	cout << "you win!."
	}
}


else if(input = b)
{
	cout << "You choose paper,/n";

	if(comp = 1)
	{
	cout << "the computer choose rock./n";
	cout << "you win!";
	}

	if(comp = 2)
	{
	cout << "the computer choose paper./n";
	cout << "it's a tie!"
	}

	if(comp = 3)
	{
	cout << "the computer choose Scissors./n";
	cout << "sorry you lose."
	}
}

else
{
	cout << "You choose scissors,/n";

	if(comp = 1)
	{
	cout << "the computer choose rock./n";
	cout << "sorry you lsoe.";
	}

	if(comp = 2)
	{
	cout << "the computer choose paper./n";
	cout << "you win!"
	}

	if(comp = 3)
	{
	cout << "the computer choose Scissors./n";
	cout << "its a tie!."
	}
}

}

And that's about as much as I can remember. I haven't done any programming in a while...

I think I missed a lot of semicolons, ahh well, I hate those things.

**kshcshbash** · March 19, 2007, 02:33 PM

Don't use

Code:

using namespace std;

Use

Code:

std::

to reference particular things.

Also, learn SWITCH statements.
It wouldn't hurt to do a little OOP here.
Also,

Code:

int main()

has the parameters

Code:

int main(int* argc, char** argv)

It's good for to include them

**Lee1026** · March 19, 2007, 02:36 PM

I disagree.

using namespace std;

is a perfectly good statement when you know that you won't be using anything from other namespaces.

As for OOP, this program is short enough that it is a examplary case of when not to do OOP.

And as we are not using command line arguments, it is rather pointless to include them.

**King Edward I** · March 19, 2007, 05:15 PM

shall I do a version of it in pascal to help newbies?

**Lee1026** · March 19, 2007, 05:15 PM

I don't think anyone teaches pascal anymore.

**King Edward I** · March 19, 2007, 05:17 PM

idk, learnt it years ago and can still remember making random number generators etc in it, meh, anyone done a C++ version or delphi one?, or should i do one that runs from an ISO

EDIT: According to lusted pascal is stil taught :O

**kshcshbash** · March 19, 2007, 09:49 PM

KingEdward, Pascal friggin owns!
Even if they've never coded before, reading Pascal syntax will surely help people get the feel of the logical flow.

**Lusted** · March 20, 2007, 09:26 AM

Not really, i found visual basic much easier to learn. Learning about Pascal and friggin pseudo-code just got confusing when you didn't even know 1 language very well.

**kshcshbash** · March 20, 2007, 04:41 PM

Originally Posted by Lusted

Not really, i found visual basic much easier to learn. Learning about Pascal and friggin pseudo-code just got confusing when you didn't even know 1 language very well.

Oh man. I LOVE Pascal. Whatever tickles your pickle, I suppose...

**fatsheep** · March 24, 2007, 10:21 AM

Anyone want to take a stab at another entry? Or a revision of their first entry?

**kshcshbash** · March 26, 2007, 03:43 AM

Sure I'll whack in a PHP entry once I can make my computer stop hating me...

or I'll just NOT build from sources.

**Erik** · March 20, 2007, 01:46 PM

OK, here is my entry in Lisp (Scheme)

(define human 'Human)
(define computer 'Computer)
(define nobody 'Nobody)
(define rock 'Rock)
(define paper 'Paper)
(define scissors 'Scissors)

(define human-wins 0)
(define computer-wins 0)
(define ties 0)

(define (computer-choose)
(begin (random-seed (abs (current-milliseconds)))
(case (random 3)
((0) rock)
((1) paper)
((2) scissors))))

(define (human-choose)
(begin
(printf "Choose Rock, Paper or Scissors:~n>")
(case (read)
((r R rock Rock) rock)
((p P paper Paper) paper)
((s S scissors Scissors) scissors)
(else (begin
(printf "Wrong input, ")
(human-choose))))))

(define (winner? human-choice computer-choice)
(if (eq? human-choice computer-choice)
nobody
(if (or (and (eq? human-choice rock) (eq? computer-choice scissors))
(and (eq? human-choice paper) (eq? computer-choice rock))
(and (eq? human-choice scissors) (eq? computer-choice paper)))
human
computer)))

(define (play)
(let* ((human-choice (human-choose))
(computer-choice (computer-choose))
(winner (winner? human-choice computer-choice)))
(begin
(printf "Human: ~v, Computer: ~v -> ~v wins!~n" human-choice computer-choice winner)
(cond
((eq? winner human) (set! human-wins (add1 human-wins)))
((eq? winner computer) (set! computer-wins (add1 computer-wins)))
((eq? winner nobody) (set! ties (add1 ties))))
(printf "Score: Human ~v Computer ~v Ties ~v~n" human-wins computer-wins ties)
(printf "Play again?~n>")
(case (read)
((y Y yes Yes) (play))
(else (printf "Good bye!~n"))))))

(play)

(Sorry for the (lack of) indentation, I don't know how I can prevent this forum from removing white spaces).

Sample output:

Welcome to DrScheme, version 360.
Language: Textual (MzScheme, includes R5RS).
Choose Rock, Paper or Scissors:
>rock
Human: Rock, Computer: Scissors -> Human wins!
Score: Human 1 Computer 0 Ties 0
Play again?
>yes
Choose Rock, Paper or Scissors:
>Paper
Human: Paper, Computer: Scissors -> Computer wins!
Score: Human 1 Computer 1 Ties 0
Play again?
>Yes
Choose Rock, Paper or Scissors:
>s
Human: Scissors, Computer: Scissors -> Nobody wins!
Score: Human 1 Computer 1 Ties 1
Play again?
>no
Good bye!
>

**Rhinosaur** · March 26, 2007, 03:52 AM

lol @ this thread. I actually learned both turbo pascal and basic in high school, and made simple games in both. for the life of me i couldn't do much of anything in either though, but thanks guys for the memories.

**drak10687** · March 26, 2007, 06:12 PM

@Erik
is it just a coincidence that the computer chose scissors every time in your sample?

**Erik** · March 26, 2007, 06:36 PM

Originally Posted by drak10687

@Erik
is it just a coincidence that the computer chose scissors every time in your sample?

Yes, just a coincidence.
There is nothing wrong with my code if that's what you were thinking.

**Lee1026** · March 26, 2007, 06:29 PM

Too lazy to fix it. Also, I expected the input to be in capital letters.

I do know what is wrong though, it is \n not /n

**chris_uk_83** · March 27, 2007, 08:01 AM

Here's my (rather long and convoluted) attempt at the rock paper scissors game with a java applet. I'm crap at layout so far so you'll have to excuse the poor graphics as I'm only learning the language.

I now know how to do those scrolling boxes that everyone else has put their code in.

Code:

import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class RPS extends JApplet {
    private JButton rock = new JButton("rock"),
            paper = new JButton("paper"),
            scissors = new JButton("scissors");
    private JTextArea human = new JTextArea("human chose"),
            computer = new JTextArea("computer chose"),
            score = new JTextArea("winner is");
    private String humanChoice = null;
    private String compChoice = null;
    private String winner = "not defined yet";
    public void choose() {
        Random rand = new Random();
        int i = rand.nextInt(3);        
        switch(i) {
            case 0: compChoice = "rock"; break;
            case 1: compChoice =  "paper"; break;
            case 2: compChoice =  "scissors"; break;
            default: compChoice = "failed";
        }
        System.out.println(i);
        System.out.println(compChoice);
    }
    public String winner() {
        if(humanChoice == compChoice)
            return "draw";
        else if(humanChoice == "rock" && compChoice == "paper")
            return "Computer Wins";
        else if(humanChoice == "rock" && compChoice == "scissors")
            return "Human wins";
        else if(humanChoice == "paper" && compChoice == "rock")
            return "Human wins";
        else if(humanChoice == "paper" && compChoice == "scissors")
            return "Computer wins";
        else if(humanChoice == "scissors" && compChoice == "paper")
            return "Human wins";
        else if(humanChoice == "scissors" && compChoice == "rock")
            return "Computer wins";
        else
            return "failed";
    }
    public void init() {
        Container cont = getContentPane();
        cont.setLayout(new GridLayout(2, 3));
        rock.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                choose();
                //winner();
                computer.setText("Computer chose: \n" + compChoice);
                humanChoice = "rock";
                human.setText("You chose: \n" + humanChoice);
                score.setText(winner());
            }
        });
        paper.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                choose();
                //winner();
                computer.setText("Computer chose: \n" + compChoice);
                humanChoice = "paper";
                human.setText("You chose: \n" + humanChoice);
                score.setText(winner());
            }
        });
        scissors.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                choose();
                //winner();
                computer.setText("Computer chose: \n" + compChoice);
                humanChoice = "scissors";
                human.setText("You chose: \n" + humanChoice);
                score.setText(winner());
            }
        });
        cont.add(human);
        cont.add(score);
        cont.add(computer);
        cont.add(rock);
        cont.add(paper);
        cont.add(scissors);
    }   
}

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