Maths Quiz Example DO NOT COPY UPDATED

/*
UPDATED: for flowchart, modify only the break part to non break
flowchart example:
drawn with: draw.io
main: http://i.imgur.com/XVfrg0k.png
printQuestion: http://i.imgur.com/ssA5laG.png
the rest: http://i.imgur.com/klSapQB.png

pseudocode example: https://pastebin.com/s9M3uRiN

An example for maths quiz
just for reference, please DO NOT USE THIS AS YOUR FINAL ASSIGNMENT
by: Tan Wui Yang
for: ISE class
total line of codes: 123
*/

#include <stdio.h> //for printf scanf etc
#include <stdlib.h> //for rand()
#include <time.h> //for time() for true random
#pragma warning (disable:4996) //visual studio only

//function declaration

int printMainMenu();
int printOptionMenu();
int printLevelMenu();
int printQuestion(int operationsType, int levelType);
int finishedQuestion();
int finishedQuestionCongrats();
int getUserInput(int min, int max);

void main() {
    //for true random
    srand(time(NULL));

    //variable declaration
    int userType, operationsType, levelType, correctQuestion, continueOrExit, i;
    //declare i outside for loop cause codeblock bug (?)

    //print main menu and get user input (stored in variable 'userType')
    userType = printMainMenu();

    if (userType == 1) {//user choose 1

        //do while loop
        do {
            system("cls"); //clear screen

            //print option menu and get user input (stored in variable 'operationsType')
            operationsType = printOptionMenu();

            //user input 4 (EXIT), then all this below will be skipped
            if (operationsType != 4) {
                //print level menu and get user input (stored in variable 'levelType')
                levelType = printLevelMenu();
                if (levelType != 4) {
                    do {
                        system("cls"); //clear screen

                        //reset correctQuestion after finish do while loop
                        correctQuestion = 0;

                        //print 10 questions (from 0 to 9, which total of 10)
                        for (i = 0; i < 10; i++) {
                            //correctQuestion will +1 if user type correct answer
                            correctQuestion += printQuestion(operationsType, levelType);

                        }
                        //eg of the for loop flow (Y = yes, N = no
                        //             when i = : 0  1  2  3  4  5  6  7  8  9  10
                        //correctQuestion before: 0  1  2  2  2  3  4  4  5  5  5
                        // is userAns == answer?: Y  Y  N  N  Y  Y  N  Y  N  N  N
                        //printQuestion returned: 1  1  0  0  1  1  0  1  0  0  0
                        // correctQuestion after: 1  2  2  2  3  4  4  5  5  5  5


                        //Eg: You did 8(correctQuestion) out of 10 questions
                        printf("You did %d out of 10 questions\n", correctQuestion);


                        //for assignment specification: description V
                        //if user perform well will ask if user want to go higher level

                        //if user get 80% or above (which is has 8 correct questions or above)
                        //and level is not Advanced (cause there's no higher level above Advanced)
                        //then
                        if (correctQuestion >= 8 && levelType < 3) {
                            //print congrats and prompt user if user want to go higher level and menu after finish question
                            //and get user input (stored in continueOrExit)
                            continueOrExit = finishedQuestionCongrats();

                            //if user wants to increase his level
                            if (continueOrExit == 1) {
                                //levelType increased by 1
                                levelType++;
                            }
                            else {
                                //continueOrExit - 1 to adjust the select same as normal one
                                //COE = continueOrExit
                                //finishedQuestionCongrats()    COE  COE-1     finishedQuestion()     COE
                                //(2) continue with same level   2    [1]  ->  (1) continue           [1]
                                //(3) Exit to main menu          3    [2]  ->  (2) Exit to main menu  [2]
                                continueOrExit--;
                            }
                        }
                        else { //If user did not get 80% or above, or level is Advanced
                            //print menu after finish question and get user input (stored in continueOrExit)
                            continueOrExit = finishedQuestion();
                        }

                        //if user selected exit to main menu
                        if (continueOrExit == 2) {
                            //change levelType to 4 to match the condition for my first do while loop
                            levelType = 4;
                        }
                    } while (continueOrExit == 1); //loop back if user want to continue
                }
            }
        } while (levelType == 4 && operationsType != 4); //loop back if user want to back to main menu, if user want exit program at main menu then will skip loop
    }
}

int printQuestion(int operationsType, int levelType) {
    //variable declaration
    int num1, num2, answer, userAns, range;

    //if levelType == 1, which is beginner, range given is 0 to 10
    if (levelType == 1) {
        range = 11;
    }
    //if levelType == 2, which is intermediate, range given is 0 to 100
    else if (levelType == 2) {
        range = 101;
    }
    //if levelType == 3, which is advanced, range given is 0 to 1000
    else if (levelType == 3) {
        range = 1001;
    }

    //generate random number at given range and store it to num1 and num2
    //A % B, % = modulus, which means it give remainder when A divided by B
    num1 = rand() % range;
    num2 = rand() % range;

    //if operationsType == 1, which is +
    if (operationsType == 1) {
        answer = num1 + num2;
        printf("%d + %d = ", num1, num2);
    }
    //if operationsType == 2, which is -
    else if (operationsType == 2) {
        answer = num1 - num2;
        printf("%d - %d = ", num1, num2);
    }
    //if operationsType == 3, which is *
    else if (operationsType == 3) {
        answer = num1 * num2;
        printf("%d * %d = ", num1, num2);
    }

    //scan user input, which is given is int, and store it to userAns
    scanf("%d", &userAns);

    //if userAns == answer
    //even though (answer == userAns) is correct, but the comparison is weird
    //eg: 5 = userAns   or   userAns = 5
    if (userAns == answer) {
        //tell the user he is correct
        printf("You answer is correct!\n");

        //return 1 if he is correct, for correctQuestion
        return 1;
    }
    else {
        //tell the user he is incorrect and give the answer
        printf("Your answer is incorrect, %d is the correct answer\n", answer);

        //return 0 if he is correct, for correctQuestion
        return 0;
    }
}

int printMainMenu() {
    //print the main menu
    printf("Welcome to math quiz\n");
    printf("(1) Start the math quiz\n");
    printf("(2) Exit the math quiz\n");

    //get user input at given range from 1 to 2, and return the user input
    return getUserInput(1, 2);
}

int printOptionMenu() {
    //print the arthimetic operations menu
    printf("Please choose a arthimetic operations: \n");
    printf("(1) +\n");
    printf("(2) -\n");
    printf("(3) *\n");
    printf("(4) exit\n");

    //get user input at given range from 1 to 4, and return the user input
    return getUserInput(1, 4);
}

int printLevelMenu() {
    //print the level option
    printf("Please choose a level: \n");
    printf("(1) Beginner\n");
    printf("(2) Intermediate\n");
    printf("(3) Advcanced\n");
    printf("(4) Back to arthimetic options\n");

    //get user input at given range from 1 to 4, and return the user input
    return getUserInput(1, 4);
}

int finishedQuestion() {
    //print after finished question
    printf("Choose an option: \n");
    printf("(1) Continue\n");
    printf("(2) Exit to menu\n");

    //get user input at given range from 1 to 2, and return the user input
    return getUserInput(1, 2);
}

int finishedQuestionCongrats() {
    //print after finished question when the user get 80% or above (correct 8 questions or above) and level is not advanced
    printf("You're such a genius, congratulations you have owned all the questions\n");
    printf("Choose an option: \n");
    printf("(1) To next level\n");
    printf("(2) Continue with same level\n");
    printf("(3) Exit to menu\n");

    //get user input at given range from 1 to 3, and return the user input
    return getUserInput(1, 3);
}

int getUserInput(int min, int max) {
    //variable declaration
    int userType;

    //do (get user input) while (user is giving invalid option)
    do {
        printf("Select an option: ");

        //rewind just in case some shit happens
        rewind(stdin);

        //scan user input, which is int, and store to userType
        scanf("%d", &userType);

        //if userType is within min to max
        //plargarism: this shit is copied
        //eg: min = 1, max = 4

        //will print error and ask for input again if out of range
        if (userType < min || userType > max) {
            printf("Error! Invalid option");
        }
    } while (userType < min || userType > max);
    //keep do it while userType is out of range  (either less than min, or more than max)

    //eg: userType within 1 to 4 are returned
    return userType;

    //eg of how the getUserInput will looks like
    //min = 0, max = 4
    //Select an option: 5
    //Error! Invalid option   (cause 5 > 4)
    //select an option: -1
    //Error! Invalid option   (cause -1 < 1)
    //select an option: a
    //Error! Invalid option   (if input is text, it will give weird number like 13895084 or -31538989)
    //select an option: 2
    //return 2;
}