// Math test, first shot

//Start by including libraries
#include <iostream>
#include <ctime>

using namespace std;


int addquiz(int a)
{

    //Create multiplier to use in first while loop
    //First while loop will change the value of multiplier, which will be used in later rand() command
    int multiplier = 10;
    int difficulty = 0;
    int timesdone = 0;
    int value1;
    int value2;
    int guess;
    int numbercorrect = 0;

    //While loop to change difficulty
    while (difficulty != a)
    {
        difficulty++;
        if (difficulty !=a) multiplier*=10;
    }

    //Second while loop, this one is just used to do 10 quizzes
    while (timesdone < 10)
    {
        timesdone++;

        //Setting values for quiz
        value1 = rand() %multiplier+1;
        value2 = rand() %multiplier+1;

        cout << "What is " << value1 << " + " << value2 << "?" << endl;
        cin >> guess;

        if (guess == value1+value2)
        {
            numbercorrect++;
            cout << endl;
            cout << endl;
            cout << "That is correct!" << endl;
        }
        else
        {
            cout << endl;
            cout << endl;
            cout << "That is incorrect." << endl;
        }
        if (timesdone < 10)
        {
            cout << "Next question." << endl;
            cout << endl;
        }
    }
    return numbercorrect;
}

int subquiz(int b)
{

    //Create multiplier to use in first while loop
    //First while loop will change the value of multiplier, which will be used in later rand() command
    int difficulty = 0;
    int multiplier = 10;
    int timesdone = 0;
    int value1;
    int value2;
    int value3; //Value 3 is necessary only for subtraction and division
    int guess;
    int numbercorrect = 0;

    //While loop to change difficulty
    while (difficulty != b)
    {
        difficulty++;
        if (difficulty !=b) multiplier*=10;
    }

    //Second while loop, this one is just used to do 10 quizzes
    while (timesdone < 10)
    {
        timesdone++;

        //Setting values for quiz
        value1 = rand() %multiplier+1;
        value2 = rand() %multiplier+1;
        value3 = value1 + value2;

        cout << "What is " << value3 << " - " << value2 << "?" << endl;
        cin >> guess;

        if (guess == value3-value2)
        {
            numbercorrect++;
            cout << endl;
            cout << endl;
            cout << "That is correct!" << endl;
        }
        else
        {
            cout << endl;
            cout << endl;
            cout << "That is incorrect." << endl;
        }
        if (timesdone < 10)
        {
            cout << "Next question." << endl;
            cout << endl;
        }
    }
    return numbercorrect;
}

int multquiz(int c)
{

    //Create multiplier to use in first while loop
    //First while loop will change the value of multiplier, which will be used in later rand() command
    int multiplier = 1;
    int difficulty = 0;
    int timesdone = 0;
    int value1;
    int value2;
    int guess;
    int numbercorrect = 0;

    //While loop to change difficulty
    while (difficulty != c)
    {
        if (difficulty !=c) multiplier*=10;
        difficulty++;
    }

    //Second while loop, this one is just used to do 10 quizzes
    while (timesdone < 10)
    {
        timesdone++;

        //Setting values for quiz
        value1 = rand() %multiplier+1;
        value2 = rand() %multiplier+1;

        cout << "What is " << value1 << " x " << value2 << "?" << endl;
        cin >> guess;

        if (guess == value1*value2)
        {
            numbercorrect++;
            cout << endl;
            cout << endl;
            cout << "That is correct!" << endl;
        }
        else
        {
            cout << endl;
            cout << endl;
            cout << "That is incorrect." << endl;
        }
        if (timesdone < 10)
        {
            cout << "Next question." << endl;
            cout << endl;
        }
    }
    return numbercorrect;
}

int divquiz(int d)
{

    //Create multiplier to use in first while loop
    //First while loop will change the value of multiplier, which will be used in later rand() command
    int multiplier = 1;
    int difficulty = 0;
    int timesdone = 0;
    int value1;
    int value2;
    int value3;
    int guess;
    int numbercorrect = 0;

    //While loop to change difficulty
    while (difficulty != d)
    {
        difficulty++;
        if (difficulty !=d) multiplier*=10;
    }

    //Second while loop, this one is just used to do 10 quizzes
    while (timesdone < 10)
    {
        timesdone++;

        //Setting values for quiz
        value1 = rand() %multiplier+1;
        value2 = rand() %multiplier+1;
        value3 = value1 * value2;

        cout << "What is " << value3 << " + " << value2 << "?" << endl;
        cin >> guess;

        if (guess == value3/value2)
        {
            numbercorrect++;
            cout << endl;
            cout << endl;
            cout << "That is correct!" << endl;
        }
        else
        {
            cout << endl;
            cout << endl;
            cout << "That is incorrect." << endl;
        }
        if (timesdone < 10)
        {
            cout << "Next question." << endl;
            cout << endl;
        }
    }
    return numbercorrect;
}

int main()
{
    //Declare variables
    int quizchoice = 0;
    int quizdifficulty = 0;
    bool properchoice=false;
    int timescorrect;


    //Seed random number command
    srand(time(NULL));

    //Intro and ask for quiz choice
    cout << "This is the math test. Created by Cockgoblin." << endl;
    cout << "Which test would you like to do?" << endl;
    cout << "1. Addition" << endl;
    cout << "2. Subtraction" << endl;
    cout << "3. Multiplication " << endl;
    cout << "4. Division" << endl;

    while (properchoice==false)
    {
        cin >> quizchoice;

        //Check to see if answer is valid
        if (quizchoice >= 1 && quizchoice <= 4) properchoice = true;

        if (properchoice==false)
        {
            cout << "Sorry, that was an invalid command." << endl;
            cout << endl;
        }
    }

    //Reset properchoice boolean for quizdifficulty check
    properchoice = false;

    //Ask for quiz difficulty
    cout << endl;
    cout << endl;
    cout << "What difficulty would you like?" << endl;
    cout << "1. Elementary" << endl;
    cout << "2. Junior High School" << endl;
    cout << "3. High School" << endl;
    while (properchoice==false)
    {
        cin >> quizdifficulty;

        //Check to see if answer is valid
        if (quizdifficulty >= 1 && quizdifficulty <= 3) properchoice = true;

        if (properchoice==false)
        {
            cout << "Sorry, that was an invalid command." << endl;
            cout << endl;
        }
    }

    //Call for specific quiz function
    //I know I can use an if/else for 3 and 4, don't care
    if (quizchoice == 1) timescorrect = addquiz(quizdifficulty);
    if (quizchoice == 2) timescorrect = subquiz(quizdifficulty);
    if (quizchoice == 3) timescorrect = multquiz(quizdifficulty);
    if (quizchoice == 4) timescorrect = divquiz(quizdifficulty);

    cout << "You got " << timescorrect << " out of 10 questions right. :)" << endl;

    system("PAUSE");
    return 0;
}