Write a program in the Codio programming environment that allows you to play the game of Rock / Paper / Scissors against the computer. Within the Codio starting project you will find starter code as well as tests to run at each stage. There are three stages to the program, as illustrated below. You must pass the tests at each stage before continuing in to the next stage. We may rerun all tests within Codio before grading your program. Please see the executable version of the program within the Codio project for the definitive version of what it should look like, as sometimes conversion to html to display on this page can affect how the output lines up.
The first stage sets the computer guess to always be 'R' for Rock each move. Running the program with the first stage should look like the following:
CS 141 Program #1: Rock/Paper/Scissors
Welcome to the game of Rock/Paper/Scissors where you play against
the computer. On each move the computer will choose R, P, or S, then
the user will be prompted for their choice, and then the score will
be updated. P beats R, R beats S, and S beats P. The score starts
at 0. Add one if the person wins, subtract one if the computer wins.
The game ends if the score reaches -5 or + 5.
User input of 'x' or 'X' causes the game to exit.
Here we go!
Select how the computer chooses its move:
1. Always choose Rock
2. Random guess
3. Random guess with graphical score
Enter your choice: 1
1. Your move: r
Computer chose R
Tie. Score: 0
2. Your move: R
Computer chose R
Tie. Score: 0
3. Your move: p
Computer chose R
User's point. Score: 1
4. Your move: S
Computer chose R
Computer's point. Score: 0
5. Your move: x
Exiting program...
Tie game!
Ending program...
The second stage uses a random number generator to set the
computer's guess to be 'R' for Rock, 'P' for Paper, or 'S' for
Scissors. In order for your output to match what is
expected, you must do the following:
1. Get a random number using rand() % 3 to give you a result
of 0, 1, or 2
2. Use the result of the previous step to decide which letter to
assign to the computer's guess. If it is 0, assign 'R'. If it is 1,
assign 'P'. If it is 2, assign 'S'.
Running the second stage should look like the following:
CS 141 Program #1: Rock/Paper/Scissors
Welcome to the game of Rock/Paper/Scissors where you play against
the computer. On each move the computer will choose R, P, or S, then
the user will be prompted for their choice, and then the score will
be updated. P beats R, R beats S, and S beats P. The score starts
at 0. Add one if the person wins, subtract one if the computer wins.
The game ends if the score reaches -5 or + 5.
User input of 'x' or 'X' causes the game to exit.
Here we go!
Select how the computer chooses its move:
1. Always choose Rock
2. Random guess
3. Random guess with graphical score
Enter your choice: 2
1. Your move: r
Computer chose P
Computer's point. Score: -1
2. Your move: P
Computer chose P
Tie. Score: -1
3. Your move: r
Computer chose R
Tie. Score: -1
4. Your move: p
Computer chose P
Tie. Score: -1
5. Your move: x
Exiting program...
Computer wins!
Ending program...
The third stage is the same as the second except it displays the score graphically rather than as a number. Running the third stage should look like the following:
CS 141 Program #1: Rock/Paper/Scissors
Welcome to the game of Rock/Paper/Scissors where you play against
the computer. On each move the computer will choose R, P, or S, then
the user will be prompted for their choice, and then the score will
be updated. P beats R, R beats S, and S beats P. The score starts
at 0. Add one if the person wins, subtract one if the computer wins.
The game ends if the score reaches -5 or + 5.
User input of 'x' or 'X' causes the game to exit.
Here we go!
Select how the computer chooses its move:
1. Always choose Rock
2. Random guess
3. Random guess with graphical score
Enter your choice: 3
1. Your move: r
Computer chose P
Computer's point.
-5 -4 -3 -2 -1 0 1 2 3 4 5
----------------------------------
..............^
2. Your move: s
Computer chose P
User's point.
-5 -4 -3 -2 -1 0 1 2 3 4 5
----------------------------------
.................^
3. Your move: p
Computer chose R
User's point.
-5 -4 -3 -2 -1 0 1 2 3 4 5
----------------------------------
....................^
4. Your move: s
Computer chose P
User's point.
-5 -4 -3 -2 -1 0 1 2 3 4 5
----------------------------------
.......................^
5. Your move: x
Exiting program...
User wins!
Ending program...
What You Need to Know
Grading Rubric
The grading rubric is included in your starter code within your Codio project, and is included here as well.
55 Execution points
Option 1: (Computer always chooses R) and:
2 User input of X immediately exits program
3 User input of x (lower-case) immediately exits program
10 Program handles both lower and upper case user input (e.g. 'r' and 'R'); Move number increments each move
15 Score updates correctly for all user inputs: r, p, s
Option 2: Computer's move is random and:
7 Predetermined input sequence correctly leads to a win for computer, with assessment results hidden
8 Predetermined input sequence correctly leads to a win for computer, with assessment results hidden
Option 3:
2 Correctly displays and updates the graphical score
8 Correctly displays and updates the graphical score, with assessment results hidden
45 Programming Style (Given only if program runs substantially correctly)
10 Meaningful identifier names
10 Comments: Has header. Comments on each block of code.
15 Appropriate data and control structures. Code duplication is avoided.
10 Code Layout: Appropriate indentation and blank lines.
#include<iostream>
#include <string>
#include <stdlib.h>
#include <time.h>
int getComputerChoice();
int getPlayerChoice();
bool isTie(int playerChoice,int computerChoice);
bool isPlayerWinner(int playerChoice,int computerChoice);
int main()
{
char option;
int computerChoice;
int playerChoice;
//srand funtion outside the loop
//if we put inside the for loop same random number is
generated
//Srand will seed the random number generator to
prevent random numbers from being the same every time
srand(time(NULL));
string computerSelection;
string playerSelection;
do
{
cout<<"ROCK PAPER SCISSORS
MENU\n";
cout<<"-------------------------\n";
cout<<"p)Play Game\n";
cout<<"q)Quit\n";
cout<<"Enter your
option\n";
cin>>option;
switch(option)
{
case
'p':
playerChoice =
getPlayerChoice();
if(playerChoice==1)
cout<<"You chose: Rock\n";
else
if(playerChoice==2)
cout<<"You chose: Paper\n";
else
if(playerChoice==3)
cout<<"You chose: Scissors\n";
computerChoice =
getComputerChoice();
if(computerChoice==1)
cout<<"The computer chose: Rock\n";
else
if(computerChoice==2)
cout<<"The computer chose: Paper\n";
else
if(computerChoice==3)
cout<<"The computer chose: Scissors\n";
if(isTie(playerChoice,computerChoice))
{
cout<<"It's a TIE!\n";
}
else
if(isPlayerWinner(playerChoice,computerChoice))
{
cout<<"You WIN!\n";
}
else
{
cout<<"Sorry you LOSE.\n";
}
break;
case 'q':
break;
default:
cout<<"Invalid
Choice\n";
}
}while(option!='q');
return 0;
}
int getComputerChoice()
{
int randnum;
//Generate number between 1 and 3
randnum = 1 + (rand() % 3);
return randnum;
}
int getPlayerChoice()
{
int playerChoice;
while(true)
{
cout<<"Rock, Paper or
Scissors?\n";
cout<<"1) Rock\n";
cout<<"2) Paper\n";
cout<<"3) Scissors\n";
cout<<"Please enter your
choice:\n";
cin>>playerChoice;
switch(playerChoice)
{
case 1:
return 1;
break;
case 2:
return 2;
break;
case 3:
return 3;
break;
default:
cout<<"Please enter 1 or 2 or 3
only\n";
}
}
return playerChoice;
}
bool isTie(int playerChoice,int computerChoice)
{
if(playerChoice==computerChoice)
return true;
else
return false;
}
bool isPlayerWinner(int playerChoice,int
computerChoice)
{
if(playerChoice==1 && computerChoice==3)
return true;
else if(playerChoice==3 &&
computerChoice==2)
return true;
else if(playerChoice==2 &&
computerChoice==1)
return true;
else
return false;
}
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