C++ Who want's to be a millionare

truecrafting · March 14, 2019

So I have a bit of a dilemma I am currently trying to make a Who wants to be a millionaire on c++ and the problem is how do I loop it or what loop should I use so i can repeat the question if they answered the question wrong

also how do i make it so that i can have lifelines I am still looking but too no avail

#include<iostream>
#include<stdlib.h>

using namespace std;

main()
{


//input
 
char answer;
string name;
int x;





//INTRODUCTION
cout<<"Enter player name: ";
cin>>name;

cout<<"WELCOME " <<name<< " TO WHO WANTS TO BE A MILLIONARE"<<endl;
cout<<"INTRODCING YOU'RE HOST C++"<<endl<<endl;
system("pause");
cout<<"RULES"<<endl;
cout<<"1.ANSWER IN ALL CAPS"<<endl;
cout<<"2.YOU HAVE 3 LIFELINES CALL A FRIEND,50-50 and skip question"<<endl;
cout<<"3.NO CHEATING"<<endl <<endl <<endl;
cout<<"WITHOUT FURTHER A DO WHO WANT TO BE A MILLIONARE?"<<endl;
system("pause");






//QUESION
//question 1
cout<<"Who is the Current Chancellor of Germany"<<endl;
cout<<"A-Wilhem II"<<endl;
cout<<"B-Angela Merkel"<<endl;
cout<<"C-Franz Hamburg"<<endl;
cout<<"D-Hanz Zimmerman"<<endl;
cin>>answer;
if (answer=='B'||answer=='b'){
cout<<"Correct"<<endl<<endl;
}
else{
cout<<"Wrong!"<<endl<<endl;
}




//QUESTION 2
cout<<"Who is the competitor Wolfgang Amadeus Mozart?"<<endl;
cout<<"A-Antonio Sallieri"<<endl;
cout<<"B-Ludwig Beethoven"<<endl;
cout<<"C-Johann Pachelbel"<<endl;
cout<<"D-Johann Sallieri"<<endl;
cin>>answer;
if (answer=='a'||answer=='A'){
cout<<"Correct"<<endl<<endl;
}
else{
cout<<"Wrong!"<<endl<<endl;
}








//QUESTION 3
cout<<"In Computer Hardware what does GPU mean?"<<endl;
cout<<"A-Game Processing Unit"<<endl;
cout<<"B-Gamma Processing Unit"<<endl;
cout<<"C-Grayscale Processing Unit"<<endl;
cout<<"D-Graphics Processing Unit"<<endl;
cin>>answer;
if (answer=='d'||answer=='D'){
cout<<"Correct"<<endl<<endl;
}
else{
cout<<"Wrong!"<<endl<<endl;
}

//QUESTION 4
cout<<"In the 2018 Oscar's What Movie won BEST PICTURE'"<<endl;
cout<<"A-The Favourite"<<endl;
cout<<"B-Bohemian Rhapsody"<<endl;
cout<<"C-Green Book"<<endl;
cout<<"D-Shape Of Water"<<endl;
cin>>answer;
if (answer=='C'||answer=='c'){
cout<<"Correct"<<endl<<endl;
}
else{
cout<<"Wrong!"<<endl<<endl;
}


//QUESTION 5
cout<<"As of now what airline is the oldest"<<endl;
cout<<"A-Qantas"<<endl;
cout<<"B-Delta"<<endl;
cout<<"C-Avianca"<<endl;
cout<<"D-KLM"<<endl;
cin>>answer;
if (answer=='D'||answer=='d'){
cout<<"Correct"<<endl<<endl;
}
else{
cout<<"Wrong!"<<endl<<endl;
}

//QUESTION 6
 
  
cout<<"Currently What Car is the fastest production car"<<endl;
cout<<"A-Koenisegg Regera"<<endl;
cout<<"B-Buggati Chiron"<<endl;
cout<<"C-Mclaren Senna"<<endl;
cout<<"D-Buggati Veyron"<<endl;
cin>>answer;
if (answer=='b'||answer=='B'){
cout<<"Correct"<<endl<<endl;
}
else{
cout<<"Wrong!"<<endl<<endl;
}











system("pause");
}

replies much appreciated

Technomancer__ · March 14, 2019

for example

cout<<"Who is the Current Chancellor of Germany"<<endl;
cout<<"A-Wilhem II"<<endl;
cout<<"B-Angela Merkel"<<endl;
cout<<"C-Franz Hamburg"<<endl;
cout<<"D-Hanz Zimmerman"<<endl;
cin>>answer;
while (answer!='B'||answer!='b'){
cout<<"Wrong! try again"<<endl;
cin>>answer;
}
cout<<"Correct"<<endl;

truecrafting · March 14, 2019

1 hour ago, Technomancer__ said:

for example


cout<<"Who is the Current Chancellor of Germany"<<endl;
cout<<"A-Wilhem II"<<endl;
cout<<"B-Angela Merkel"<<endl;
cout<<"C-Franz Hamburg"<<endl;
cout<<"D-Hanz Zimmerman"<<endl;
cin>>answer;
while (answer!='B'||answer!='b'){
cout<<"Wrong! try again"<<endl;
cin>>answer;
}
cout<<"Correct"<<endl;

yes i would like to attach smthn that will ask the question again if it is wrong

truecrafting · March 14, 2019

1 hour ago, James Evens said:

first of all why not use a database or Array to store the questions?

If you just want to know if the answer was wrong make a array of byte and use three states: not asked, wrong answer, right answer

for simplicity i just decided to not add databases that have more chances of not working

truecrafting · March 14, 2019

1 hour ago, James Evens said:

Array of struct makes your life easier.

Fill the array and then just loop through it in the way you want.

can you give me an example so i can try to mimic it

Unimportant · March 14, 2019

1 hour ago, truecrafting said:

<snip>

There's another gotcha that you overlooked. What happens when the user enters multiple characters as an answer to a question? (try it).

You need to clear the input stream after each input operation to flush any additional nonsense the user may have typed.

Also note that `system("pause")` is not portable.

Modified example:

#include <iostream>
#include <stdlib.h>
#include <limits>
#include <cctype>

using namespace std;

void
CheckAnswer(char correctAnswer)
{
	while (1) //endless loop.
	{
		char answer;
		std::cin >> answer;

		/* Clear the cin input stream! */
		cin.ignore(numeric_limits<streamsize>::max(), '\n');
		answer = toupper(answer);

		if (answer == correctAnswer)
		{
			std::cout << "Correct!\n";
			break; //break from endless loop.		
		}
		else
		{
			std::cout << "Wrong!\n";
		} 
	}
}

main()
{
	/* place the introduction in a scope of it's own, this limits the scope of 
	   std::string name so it does not pollute the entire main function. */
	{
		//INTRODUCTION
		cout<<"Enter player name: ";
		string name;
		cin>>name;

		cout<<"WELCOME " <<name<< " TO WHO WANTS TO BE A MILLIONARE"<<endl;
		cout<<"INTRODCING YOU'RE HOST C++"<<endl<<endl;
		system("pause");
		cout<<"RULES"<<endl;
		cout<<"1.ANSWER IN ALL CAPS"<<endl;
		cout<<"2.YOU HAVE 3 LIFELINES CALL A FRIEND,50-50 and skip question"<<endl;
		cout<<"3.NO CHEATING"<<endl <<endl <<endl;
		cout<<"WITHOUT FURTHER A DO WHO WANT TO BE A MILLIONARE?"<<endl;
		system("pause");
	}

	//QUESION
	//question 1
	cout<<"Who is the Current Chancellor of Germany"<<endl;
	cout<<"A-Wilhem II"<<endl;
	cout<<"B-Angela Merkel"<<endl;
	cout<<"C-Franz Hamburg"<<endl;
	cout<<"D-Hanz Zimmerman"<<endl;
	CheckAnswer('B');

	//QUESTION 2
	cout<<"Who is the competitor Wolfgang Amadeus Mozart?"<<endl;
	cout<<"A-Antonio Sallieri"<<endl;
	cout<<"B-Ludwig Beethoven"<<endl;
	cout<<"C-Johann Pachelbel"<<endl;
	cout<<"D-Johann Sallieri"<<endl;
	CheckAnswer('A');

	/*...etc...*/

	system("pause");
}

truecrafting · March 14, 2019

1 problem done now how do i insert a lifeline system in this

Unimportant · March 14, 2019

How do you envision this lifeline, what should it look like ?

truecrafting · March 15, 2019

17 hours ago, Unimportant said:

How do you envision this lifeline, what should it look like ?

simple you input something like 50-50,Skip and Call a friend (for this it's a simple cout)

Unimportant · March 15, 2019

2 hours ago, truecrafting said:

simple you input something like 50-50,Skip and Call a friend (for this it's a simple cout)

You're going to have to switch to a more automated approach or it'll get messy quick.

What's your level? Do you know classes, std::vector, ...?

truecrafting · March 15, 2019

1 hour ago, Unimportant said:

You're going to have to switch to a more automated approach or it'll get messy quick.

What's your level? Do you know classes, std::vector, ...?

im just i would say a beginner to average I just attend my mandatory computer classes at my school

truecrafting · March 15, 2019

On 3/14/2019 at 6:39 PM, Unimportant said:

There's another gotcha that you overlooked. What happens when the user enters multiple characters as an answer to a question? (try it).

You need to clear the input stream after each input operation to flush any additional nonsense the user may have typed.

Also note that `system("pause")` is not portable.

Modified example:


#include <iostream>
#include <stdlib.h>
#include <limits>
#include <cctype>

using namespace std;

void
CheckAnswer(char correctAnswer)
{
	while (1) //endless loop.
	{
		char answer;
		std::cin >> answer;

		/* Clear the cin input stream! */
		cin.ignore(numeric_limits<streamsize>::max(), '\n');
		answer = toupper(answer);

		if (answer == correctAnswer)
		{
			std::cout << "Correct!\n";
			break; //break from endless loop.		
		}
		else
		{
			std::cout << "Wrong!\n";
		} 
	}
}

main()
{
	/* place the introduction in a scope of it's own, this limits the scope of 
	   std::string name so it does not pollute the entire main function. */
	{
		//INTRODUCTION
		cout<<"Enter player name: ";
		string name;
		cin>>name;

		cout<<"WELCOME " <<name<< " TO WHO WANTS TO BE A MILLIONARE"<<endl;
		cout<<"INTRODCING YOU'RE HOST C++"<<endl<<endl;
		system("pause");
		cout<<"RULES"<<endl;
		cout<<"1.ANSWER IN ALL CAPS"<<endl;
		cout<<"2.YOU HAVE 3 LIFELINES CALL A FRIEND,50-50 and skip question"<<endl;
		cout<<"3.NO CHEATING"<<endl <<endl <<endl;
		cout<<"WITHOUT FURTHER A DO WHO WANT TO BE A MILLIONARE?"<<endl;
		system("pause");
	}

	//QUESION
	//question 1
	cout<<"Who is the Current Chancellor of Germany"<<endl;
	cout<<"A-Wilhem II"<<endl;
	cout<<"B-Angela Merkel"<<endl;
	cout<<"C-Franz Hamburg"<<endl;
	cout<<"D-Hanz Zimmerman"<<endl;
	CheckAnswer('B');

	//QUESTION 2
	cout<<"Who is the competitor Wolfgang Amadeus Mozart?"<<endl;
	cout<<"A-Antonio Sallieri"<<endl;
	cout<<"B-Ludwig Beethoven"<<endl;
	cout<<"C-Johann Pachelbel"<<endl;
	cout<<"D-Johann Sallieri"<<endl;
	CheckAnswer('A');

	/*...etc...*/

	system("pause");
}

another question how do i set a limit for only 3 overall mistakes and goes ahead and stops the program when it reaches 3 mistakes in the program

Unimportant · March 15, 2019

23 minutes ago, truecrafting said:

another question how do i set a limit for only 3 overall mistakes and goes ahead and stops the program when it reaches 3 mistakes in the program

As already mentioned, you're going to have to redesign the entire program to a more automated design in order to facilitate your lifelines. Such a design could also easily facilitate a maximum number of wrong answers.

Your current linear design is at it's limits, you can't keep retrofitting a poor design without it becoming a mess.

This problem is not as simple as it looks, I could whip up an example but it would quickly include advanced language features for which I think you're not ready.

truecrafting · March 15, 2019

1 hour ago, Unimportant said:

As already mentioned, you're going to have to redesign the entire program to a more automated design in order to facilitate your lifelines. Such a design could also easily facilitate a maximum number of wrong answers.

Your current linear design is at it's limits, you can't keep retrofitting a poor design without it becoming a mess.

This problem is not as simple as it looks, I could whip up an example but it would quickly include advanced language features for which I think you're not ready.

If it's not a burden on you can you show me because i also want to further or rxpand my knowledge on c++

Unimportant · March 15, 2019

22 hours ago, truecrafting said:

If it's not a burden on you can you show me because i also want to further or rxpand my knowledge on c++

Something along these lines, could be made more pretty but that would require going pretty deep.

#include <iostream>
#include <string>
#include <vector>
#include <utility>
#include <random>
#include <limits>
#include <cctype>

class Question
{
public:

    /* Template factory function where template parameter is the correct answer index.
     * This, in combination with private constructor, makes the possibility of a invalid
     * correct answer index a compile time problem. */
    template <int correctAnswer>
    static Question
    Make(std::string text, std::string answer1, std::string answer2,
                 std::string answer3, std::string answer4)
    {
        static_assert(correctAnswer >= 0 && correctAnswer <= 3, "Invalid correctAnswer!");
        return Question(std::move(text), {answer1, answer2, answer3, answer4}, correctAnswer);
    }

    const std::string&
    GetText() const
    {
        return mText;
    }

    const std::vector<std::string>&
    GetAnswers() const
    {
        return mAnswers;
    }

    bool
    CheckAnswer(int answer) const
    {
        return answer == mCorrectAnswer;
    }

    /* Randomly removes 2 answers while updating the correct answer index.
     * Makes sure the correct answer is not removed.*/
    void
    CullAnswers()
    {
        if (!mIsCulled)
        {
            mIsCulled = true;

            std::random_device rd;
            std::uniform_int_distribution<> dist(0, 3);
            while (int(mAnswers.size()) > 2)
            {
                RemoveAnswer(dist(rd));
            }
        }
    }

private:

    /* Private constructor, force usage of Make function.*/
    Question(std::string text, std::vector<std::string> answers, int correctAnswer) :
        mText(std::move(text)),
        mAnswers(std::move(answers)),
        mCorrectAnswer(correctAnswer)
    {}

    /* Removes the answer at the given index. Does nothing if index is out of range
     * or index is the correct answer. Updates the correct answer index. */
    void
    RemoveAnswer(int index)
    {
        if (index >= int(mAnswers.size()) || index == mCorrectAnswer)
        {
            return;
        }
        if (index < mCorrectAnswer)
        {
            --mCorrectAnswer;
        }
        mAnswers.erase(mAnswers.begin() + index);
    }

    std::string
    mText;

    std::vector<std::string>
    mAnswers;

    int
    mCorrectAnswer;

    bool
    mIsCulled = false;
};

void
PrintQuestion(const Question& question)
{
    std::cout << question.GetText() << '\n';
    char letter = 'A';
    for (const auto& answer : question.GetAnswers())
    {
        std::cout << letter++ << " - " << answer << '\n';
    }
}

void
PrintLifeLines(bool skipAvailable, bool fiftyFiftyAvailable)
{
    if (skipAvailable)
    {
        std::cout << "1 - Skip Question\n";
    }
    if (fiftyFiftyAvailable)
    {
        std::cout << "2 - 50/50\n";
    }
}

char
GetUserInput()
{
    char userInput;
    std::cin >> userInput;
    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
    return toupper(userInput);
}

int
main()
{
    const std::vector<Question> questions =
    {
        Question::Make<1>("Who is the Current Chancellor of Germany?",
                          "Wilhem II",
                          "Angela Merkel",
                          "Franz Hamburg",
                          "Hanz Zimmerman"),
        Question::Make<0>("Who is the competitor Wolfgang Amadeus Mozart?",
                          "Antonio Sallieri",
                          "Ludwig Beethoven",
                          "Johann Pachelbel",
                          "Johann Sallieri")
        /* ...etc... */
    };

    bool skipAvailable = true;
    bool fiftyFiftyAvailable = true;
    int numWrongAnswers = 0;

    for (auto currentQuestion : questions)
    {
        while (1)
        {
            PrintQuestion(currentQuestion);
            PrintLifeLines(skipAvailable, fiftyFiftyAvailable);
            const auto userInput = GetUserInput();

            if (userInput == '1' && skipAvailable)
            {
                skipAvailable = false;
                break;
            }

            if (userInput == '2' && fiftyFiftyAvailable)
            {
                fiftyFiftyAvailable = false;
                currentQuestion.CullAnswers();
            }
            else
            {
                if (currentQuestion.CheckAnswer(userInput - 'A'))
                {
                    std::cout << "Correct!\n";
                    break;
                }
                else
                {
                    std::cout << "Wrong!\n";
                    if (++numWrongAnswers >= 3)
                    {
                        std::cout << "3 wrong answers given!\n";
                        return 0;
                    }
                }
            }
        }
    }

    return 0;
}

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