Question

Write a computer game based on rock-paper- scissors in C++. The 2-player game will be interactive: human vs. computer!
Making the game interactive presents a new issue for us -- how do we get the computer's choice?
To solve this, we will use a "random number generator", which is the basis for all computer gaming.
This enables the properly programmed computer to act like it is actually "thinking" and making its
own decisions.
This is the largest, most involved program we have yet written. It will require careful step-by- step
development. You will be lead through this one in a series of steps, in an effort to train you in the
software development process.
In the coding for this game you will use code blocks, loops, and if and/or switch structures.
Organizing code into "code blocks" will prepare you for moving code blocks into subprograms in
coming labs.
The game will replay until the human player decides to quit. Human input will be through the
keyboard, entering R for rock, P for paper, S for scissors, or Q to quit. Computer input will be
randomly generated. Here is sample output for the game, with the input prompt in blue, the human
response in red, and the results in green:
Choose: [Rock,Paper,Scissors,Quit]: p
Computer:S, Human:P, Computer wins
Choose: [Rock,Paper,Scissors,Quit]: p
Computer:P, Human:P, tie
Choose: [Rock,Paper,Scissors,Quit]: p
Computer:R, Human:P, Human wins
Choose: [Rock,Paper,Scissors,Quit]: p
Computer:S, Human:P, Computer wins
Choose: [Rock,Paper,Scissors,Quit]: x
Choose: [Rock,Paper,Scissors,Quit]: p
Computer:S, Human:P, Computer wins
Choose: [Rock,Paper,Scissors,Quit]: q
Do not color code your I/O!

Use only techniques taught in this class. Do NOT use regular expressions. Do NOT use arrays. Do
NOT use subprograms. Do NOT use pointers. These are great programming tools, but we have not
covered them.

Answer 1

#include<iostream>
#include<time.h> //needed for seeding rand
#include<stdlib.h>//contains srand,rand()
using namespace std;
int main()
{ int choice;
srand (time(NULL)); //initialze random seed
int comp=rand()%3+1;//generates a random no. between 1,2 & 3 and assigns it to Computer
char player='a'; //storing choice of player
while(player!='q'&&player!='Q')
{
cout<<"Choose: [Rock,Paper,Scissors,Quit]:";
cin>>player;
  
  
if(player=='r' || player=='R') //converting player move to equivalent number
{ //rock=1,paper=2,scissors=3
choice=1;
cout<<" Human:R, ";
}
else if(player=='p'||player=='P')
{
choice=2;
cout<<" Human:P ";
}
else if(player=='s'||player=='S')
{
choice=3;
cout<<" Human:S ";
}
else
continue;
//finding result
if(comp==1)
cout<<"Computer:R,";
if(comp==2)
cout<<"Computer:P,";
if(comp==3)
cout<<"Computer:S,";
if(choice==4)
  
if(comp==1&&choice==3)
cout<<"Computer wins\n";
if(comp==1&choice==2)
cout<<"Human wins\n";
if(comp==2&&choice==1)
cout<<"Computer wins\n";
if(comp==2&&choice==3)
cout<<"Human wins\n";
if(comp==3&&choice==1)
cout<<"Human win\n";
if(comp==3&&choice==2)
cout<<"Computer wins\n";
if(comp==choice)
cout<<"tie\n";
  
}
return 0;
}