C++ PROGRAM // Function Prototypes // ******************************************

Question

C++ PROGRAM

// Function Prototypes

// ********************************************************

// The getUserChoice function displays a menu allowing    *

// the user to select rock, paper, or scissors. The       *

// function then returns 1 for rock (via the ROCK         *

// constant), or 2 for paper (via the PAPER constant),    *

// or 3 for scissors (via the SCISSORS constant).         *

// ********************************************************

int getUserChoice();

// ********************************************************

// The getComputerChoice function returns the computer's *

// game choice. It returns 1 for rock (via the ROCK       *

// constant), or 2 for paper (via the PAPER constant),    *

// or 3 for scissors (via the SCISSORS constant).         *

// YOU NEED to use rand()

// ********************************************************

int getComputerChoice();

// ********************************************************

// The determineWinner function accepts the user's game   *

// choice and the computer's game choice as arguments and *

// displays a message indicating the winner.              *

// For example, If the user chooses rock and the computer chooses

// scissors, you should display “ rock smashes scissors”

// ********************************************************

void determineWinner(int, int);

// ********************************************************

// The displayChoice function accepts an integer argument *

// and displays rock, paper, or scissors.                 *

// ********************************************************

void displayChoice(int);

//The displayChoice function is written for you.

void displayChoice(int choice)

{

    int ROCK         = 1;

    int PAPER        = 2;

    int SCISSORS     = 3;

    if (choice == ROCK)

        cout << "Rock ";

    else if (choice == PAPER)

        cout << "Paper ";

    else if (choice == SCISSORS)

        cout << "Scissors ";

    else

        cout << "Error condition detected! ";

}

Your main function will look like this. You need to call your functions at the appropriate locations.

int main()

{

       int userChoice;      // To hold the user's choice

       int computerChoice; // To hold the computer's choice

       // Get the computer's choice.      

       // Get the user's choice.      

       while (userChoice != 4)

       {

              // Determine the winner.          

              // Get the computer's choice.             

              // Get the user's choice.             

       }

       return 0;

}

Explanation / Answer

#include <vector>

#include <iostream>

using namespace std;

// Function Prototypes

// ********************************************************

// The getUserChoice function displays a menu allowing *

// the user to select rock, paper, or scissors. The *

// function then returns 1 for rock (via the ROCK *

// constant), or 2 for paper (via the PAPER constant), *

// or 3 for scissors (via the SCISSORS constant). *

// ********************************************************

int getUserChoice();

// ********************************************************

// The getComputerChoice function returns the computer's *

// game choice. It returns 1 for rock (via the ROCK *

// constant), or 2 for paper (via the PAPER constant), *

// or 3 for scissors (via the SCISSORS constant). *

// YOU NEED to use rand()

// ********************************************************

int getComputerChoice();

// ********************************************************

// The determineWinner function accepts the user's game *

// choice and the computer's game choice as arguments and *

// displays a message indicating the winner. *

// For example, If the user chooses rock and the computer chooses

// scissors, you should display “ rock smashes scissors”

// ********************************************************

void determineWinner(int, int);

// ********************************************************

// The displayChoice function accepts an integer argument *

// and displays rock, paper, or scissors. *

// ********************************************************

void displayChoice(int);

//The displayChoice function is written for you.

void displayChoice(int choice)

{

int ROCK = 1;

int PAPER = 2;

int SCISSORS = 3;

if (choice == ROCK)

cout << "Rock ";

else if (choice == PAPER)

cout << "Paper ";

else if (choice == SCISSORS)

cout << "Scissors ";

else

cout << "Error condition detected! ";

}

int main()

{

int userChoice; // To hold the user's choice

int computerChoice; // To hold the computer's choice

// Get the computer's choice.

// Get the user's choice.

userChoice = getUserChoice();

computerChoice = getComputerChoice();

while (userChoice != 4)

{

cout<<"User selected: ";

displayChoice(userChoice);

cout<<"Computer selected: ";

displayChoice(computerChoice);

cout<<" ";

determineWinner(userChoice, computerChoice);

  

cout<<" ";

userChoice = getUserChoice();

computerChoice = getComputerChoice();

}

return 0;

}

int getUserChoice() {

cout<<"Enter 1 for rock 2 for paper 3 for scissors Enter: ";

int in;

cin>>in;

return in;

}

int getComputerChoice() {

int c = rand()%3+1;

return c;

}

void determineWinner(int a, int b) {

if (a == b) {

cout<<"Draw!!";

} else if ((a==1 && b==2)||(a==2 && b==1)) {

cout<<"Paper beats Rock !!";

} else if ((a==2 && b==3)||(a==3 && b==2)) {

cout<<"Scissor beats Paper !!";

} else {

cout<<"Rock beats Scissors !!";

}

}

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