Question

Write C++ program,

program should include at least

the following functions:



getComputerGuess(): this function should return a random value

generated by the computer using

rand function (

read more about

random numbers in Chapter 3 pages 126 – 128

).



getUsersChoice(): this function will ask the user to enter a choice using a

menu. It then returns the user’s selected choice. Here is the menu:

“1) Rock 2)Paper 3) Scissors 4) Quit”

You should allow the game to keep playing until the user decides to quit,

that’s when the user chooses 4 from the menu.



findTheWinner(int, int): this function has two parameters (one is the

user’s choice and the other one is the computer’s randomly generated

choice). Based on the passed arguments the function should display the

user’s choice, the computer’s choice and the winner.

Answer 1

#include <cstdlib>

#include <iostream>

using namespace std;

int getComputerGuess(){

return (rand()%3);

}

void findTheWinner(int userIp, int compIp){

//Displaying the results.

cout<<"\nUSER'S CHOICE : " ;

switch(userIp){

case 1 : cout<<"Rock.\t"; break;

case 2 : cout<<"Paper.\t"; break;

case 3 : cout<<"Scissors.\t"; break;

}

cout<<"COMPUTER'S CHOICE : ";

switch(compIp){

case 1 : cout<<"Rock.\n"; break;

case 2 : cout<<"Paper.\n"; break;

case 3 : cout<<"Scissors.\n"; break;

}

  

if(!(userIp >= 1 && userIp <= 4)){

cout<<"Invalid Input";

  

}

else if(userIp == 1 && compIp == 1){

cout<<"WINNER : NO WINNER(Tie).\n\n";

}

else if(userIp == 2 && compIp == 2){//1 : User Wins & 2 : Computer Wins & 0 : Tie

cout<<"WINNER : NO WINNER(Tie).\n\n";

}

else if(userIp == 3 && compIp == 3){

cout<<"WINNER : NO WINNER(Tie).\n\n";

}

else if(userIp == 1 && compIp == 2){// Rock wins between Rock and Paper.

// Rock wins between Rock and Scissors.

// Scissors win between Paper and Scissors.

cout<<"WINNER : User.\n\n";

}

else if(userIp == 2 && compIp == 1){

cout<<"WINNER : Computer.\n\n";

}

else if(userIp == 1 && compIp == 3){

cout<<"WINNER : User";

}

else if(userIp == 3 && compIp == 1){

cout<<"WINNER : Computer.\n\n";

}

else if(userIp == 3 && compIp == 2){

cout<<"WINNER : User.\n\n";

}

else if(userIp == 2 && compIp == 3){

cout<<"WINNER : Computer.\n\n";

}

  

}

int main()

{

int userInput, computerInput;

//Displaying the Menu.

cout<<" 1) Rock.\n 2) Paper.\n 3) Scissors.\n 4) Quit.";

//Taking User Input.

cout<<"\nPlease enter your choice : ";

cin>>userInput;

//Getting Computer's Choice using rand() function.

computerInput = getComputerGuess();  

  

//Calling function to display Winner.

findTheWinner(userInput,computerInput);

while(1){

  

//Displaying the Menu.

cout<<" 1) Rock.\n 2) Paper.\n 3) Scissors.\n 4) Quit.";

//Taking User Input.

cout<<"Please enter your choice : ";

cin>>userInput;

  

//Exit Game if user enters 4.

if(userInput == 4){

exit(0);

}

  

//Getting Computer's Choice using rand() function.

computerInput = getComputerGuess();  

  

//Calling function to display Winner.

findTheWinner(userInput,computerInput);

  

}

return 0;

}