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There is an expectation that your solution should use functions. By defining your own functions, you will be able to reuse code throughout your program. It is important you provide adequate evidence of how and why you used functions in your solution.

Functions should include:

• user defined functions
• in-built functions
• mathematical functions

You should attempt to use high order functions.

Python implementation

58 def quizCreator(choice):
59 '''function to create the questions for the quiz'''
60 if choice == 1:#If easy questions picked create 5 addition & 5 subtraction questions
61     for i in range(5):
62         addQuestion()
63     for i in range(5):
64         subQuestion()
65 #test runs
67 quiz creator (menuSelection())
68 #choice returned from menuSelection function passed to quizCreator function
69 print(score)

• The quizCreator function (line 58) takes an integer value from the menuSelection function
• In line 60, selection is used to determine the level of difficulty chosen by the user
• Lines 61-62 use a count controlled loop (bound loop) to call the addQuestion function five times
• Lines 63-64 use the same technique to call the subQuestion function
• In line 67 the menuSelection function is passed as a parameter to the quizCreator function

Developmental testing

Please select the difficulty level from the menu below:
1 - Easy
2 - Medium
3 - Hard
1
Level chosen = 1
What is 8 + 8?: 16
Correct!
What is 6 + 6?: 12
Correct!
What is 2 + 2?: 3
Incorrect.
What is 4 + 6?: 10
Correct!
What is 12 + 1?: 13
Correct!
What is 10 - 12?: -2
Correct!
What is 11 - 7?: 88
Incorrect.
What is 6 - 3?: 3
Correct!
What is 9 - 4?: -5
Incorrect.
What is 9 - 3?: 6
Correct!

C# implementation

Before we can proceed, we need to have both addition and subtraction options, so we modify the addition method by replacing two + symbols with two - symbols:

static void subQuestion()
        {
            Random ran1 = new Random();
            int num1 = ran1.Next(0, 10);

            Random randT = new Random(DateTime.Now.Millisecond);
            int num2 = randT.Next(0, 10);

            Console.Write("What is " + num1 + "-" + num2 + " ?: ");
            int answer = Convert.ToInt32(Console.ReadLine());

            if (answer == num1 - num2)
            {
                Console.WriteLine("Correct!");
                Console.WriteLine("Score +1");
                score = score + 1;
            }
            else
            {
                Console.WriteLine("Incorrect.");
            }
        }

Next, we set up a quizCreator() method to accept the difficulty level and generate the correct number of addition and subtraction problems.

static void quizCreator(int diff)
        {
            // Level 1: 5 addition and 5 subtraction questions
            if(diff == 1)
            {
                // Addition questions
                for(int i=0; i<5; i++)
                {
                    addQuestion();
                }

                // Subtraction questions
                for (int j = 0; j<5; j++)
                {
                    subQuestion();
                }
            }

Finally, we introduce a call to this function at the bottom of the main method.

static void Main(string[] args)
        {
            bool valid = false; // assume the name is invalid
            String name = "";

            while (!valid)
            {
                Console.Write("Enter a name: ");
                name = Console.ReadLine();  // read in a name
                valid = validateName(name); // validate it
            }

            Console.WriteLine("DIFFICULTY");
            int level = showTheMenu();
            Console.WriteLine("Level chosen = " + level);

            quizCreator(level);

            saveScore(name, score);
        }

Output from a complete run-through using level 1, and a mixture of correct and incorrect answers:

Enter a name: Louise
Louise >> Accepted
DIFFICULTY
Please select the difficulty level from the menu below:
1 - Easy
2 - Medium
3 - Hard
1
Level chosen = 1
What is 7 + 4?: 11
Correct!
Score +1
What is 6 + 2?: 99
Incorrect.
What is 4 + 2?: 6
Correct!
Score +1
What is 2 + 1?: 3
Correct!
Score +1
What is 7 + 3?: 1
Incorrect.
What is 0 - 4?: -4
Correct!
Score +1
What is 3 - 7?: 37
Incorrect.
What is 4 - 4?: 0
Correct!
Score +1
What is 3 - 2?: 1
Correct!
Score +1
What is 0 - 9?: -9
Correct!
Score +1
Press any key to continue . . .