168: Quizz Game in C++

#include <iostream>

#include <iomanip>

using namespace std;

bool isValid(int x) // checking if the option choosed by user is valid or not

{

    cin.clear();       // this is done so that program don't become a mess

    fflush(stdin);     // when user enter some string while choosing option

    return (x == 1 || x == 2 || x == 3 || x == 4);

}

int main()

{

    string questions[] = {"Choose the capital of France:",

                          "Which planet is closest to The Sun:",

                          "Which one of the following is the primary Color:",

                          "How many legs do spider has:"};

    string options[][4] = {{"Madrid", "London", "Rome", "Paris"},

                           {"Venus", "Mars", "Mercury", "Earth"},

                           {"Blue", "Orange", "Purple", "Green"},

                           {"6", "8", "10", "14"}};

    int answer[] = {4, 3, 1, 2}, choice;

    int correct = 0, incorrect = 0;

    int i = 0;  // this is written outside because we want to run the loop again

                // when everything outside the loop is also executed (before this for loop)

    for (string element : questions)

    {

        cout << "____________________________________________________\n";

        cout << "| " << setw(49) << left << element << "|\n";

        cout << "****************************************************\n";

        for (; i < 4;)

        {

            for (int j = 0; j < 4; j++)

            {

                cout << "| " << j + 1 << ": " << setw(46) << left << options[i][j] << "|\n";

            }

            cout << "****************************************************\n";

            cout << "Enter your choice: ";

            cin >> choice;

            while (!isValid(choice))

            {

                cout << "Invalid Choice (1, 2, 3, 4) only\n";

                cout << "Enter your choice: ";

                cin >> choice;

            }

            if (choice == answer[i])

            {

                cout << "Correct\n\n";

                correct++;

            }

            else

            {

                cout << "Incorrect\n";

                incorrect++;

                cout << "Correct: " << options[i][answer[i] - 1] << endl << endl;

                // in correct, row of option is i and column is answer at i minus 1

                // because answer is starting from 1 and we need index that starts

                // from 0;

            }

            i++;

            break;

        }

    }

    cout << endl

         << "Correct: " << correct << endl;

    cout << "Incorrect: " << incorrect << endl;

    cout << endl

         << "Marks: " << correct << '/' << incorrect + correct << endl;

    cout << "Percenctage: " << ((float)correct / (correct + incorrect)) * 100 << '%' << endl;

    return 0;

}