Function Selection/Menu System Help

[CopaceticCoffee]

Hey everyone, I'm having trouble with this project I'm working on. I'm writing a program that lets the user choose between 3 different quizzes they can take. I split up the quizzes into their own functions. In the int main() function, I ask the user to select the number for the quiz they want to take. When I run the program and select a quiz, the program just ends rather than going to the function for the selected quiz. Any ideas on how to fix this are greatly appreciated! (I did not include the third function below due to the maximum character limit.)

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main()
{
	string name;
	cout << "Hello! Please enter your name: ";
	getline(cin, name);
	
	int quizSelection;
	cout << "Please make a selection. Enter 1, 2, or 3\n";
	cout << "1. Geography Quiz\n";
	cout << "2. Basic Math Quiz\n";
	cout << "3. Random Trivia Quiz\n";
	cin >> quizSelection;

	if (quizSelection == 1)
	{
		void geographyQuiz();
	}
	else if (quizSelection == 2)
	{
		void basicMathQuiz();
	}
	else if (quizSelection == 3)
	{
		void randomTriviaQuiz();
	}



	cin.get();
	return 0;

}

void geographyQuiz()
{
	// Intro to test.
	cout << "Let's test your geography skills!\n";
	cout << "I will ask you five questions.\n";
	cout << "Press the number(s) on your keypad that corresponds with your answer,\n";
	cout << "then press 'Enter' to select an answer. Good Luck!\n";
	cout << "\n\n\n";
	cout << "Geography Test" << endl;
	cout << "--------------" << endl;

	// Question A.
	const string questionA = "A. What continent is Estonia in? \n\n";
	int answerA;

	cout << questionA;
	cout << "1) South America\n";
	cout << "2) Europe\n";
	cout << "3) Asia\n";
	cout << "4) North America\n\n";
	cin >> answerA;
	if (answerA != 2)
	{
		cout << "That is incorrect! Please try again.\n";
		cout << questionA;
		cin >> answerA;
	}
	else
	{
		// Question B.
		const string messageB = "B. What is the capital of Canada?\n\n";
		int answerB;

		cout << messageB;
		cout << "1) Vancouver, BC\n";
		cout << "2) Calgary, AB\n";
		cout << "3) Ottawa, ON\n";
		cout << "4) Toronto, ON\n\n";
		cin >> answerB;
		if (answerB != 3)
		{
			cout << "That is incorrect! Please try again.\n";
			cout << messageB;
			cin >> answerB;
		}
		else
		{
			// Question C.
			const string messageC = "C. In what country is Cape Town?\n\n";
			int answerC;

			cout << messageC;
			cout << "1) South Africa\n";
			cout << "2) China\n";
			cout << "3) Hungary\n";
			cout << "4) Egypt\n\n";
			cin >> answerC;
			if (answerC != 1)
			{
				cout << "That is incorrect! Please try again.\n";
				cout << messageC;
				cin >> answerC;
			}
			else
			{
				// Question D. Two are correct. Only select one correct answer.
				const string messageD = "D. Which of the following cities is in California? (Two are correct)\n\n";
				int answerD;

				cout << messageD;
				cout << "1) Fresno\n";
				cout << "2) Indianapolis\n";
				cout << "3) Oakland\n";
				cout << "4) Chicago\n\n";
				cin >> answerD;
				if (answerD != 1 && answerD != 3)
				{
					cout << "That is incorrect! Please try again.\n";
					cout << messageD;
					cin >> answerD;
				}
				else
				{
					// Question E. Two are correct. Select both correct answers.
					const string messageE = "E. Russia is in two continents. Which two? (Select more than one letter)\n\n";
					int answerE1;
					int answerE2;

					cout << messageE;
					cout << "1) North America\n";
					cout << "2) Antarctica\n";
					cout << "3) Asia\n";
					cout << "4) Europe\n\n";
					cin >> answerE1;
					cin >> answerE2;
					if (answerE1 != 3 || answerE1 != 4 && answerE2 != 3 || answerE2 != 4)
					{
						cout << "That is incorrect! Please try again.\n";
						cout << messageE;
						cin >> answerE1;
						cin >> answerE2;
					}
					else
					{
						cout << "The test is over! Press any key to exit.";
					}
				}
			}
		}
	}
}

void basicMathQuiz()
{
	cout << "Welcome! Let's test your basic math skills!\n\n";
	cout << "I will ask you five questions.\n";
	cout << "Press the number(s) on your keypad that corresponds with your answer,\n";
	cout << "then press 'Enter' to select an answer. Good Luck!\n";
	cout << "\n\n\n";
	cout << "Basic Math Quiz" << endl;
	cout << "---------------" << endl;

	// Question A
	const string mathMessageA = "A. What is 2+20?\n\n";
	int mathAnswerA;

	cout << mathMessageA << endl;
	cout << "1. 22\n";
	cout << "2. 48\n";
	cout << "3. 77\n";
	cout << "4. 15\n";
	cin >> mathAnswerA;
	if (mathAnswerA != 1)
	{
		cout << "That is incorrect! 20% has been deducted from your score.\n";
	}
	else
	{
		cout << "That is correct!\n\n";
	}

	// Question B. 
	const string mathMessageB = "B. What is 2+2?\n\n";
	int mathAnswerB;

	cout << mathMessageB << endl;
	cout << "1. 22\n";
	cout << "2. 48\n";
	cout << "3. 4\n";
	cout << "4. 15\n";
	cin >> mathAnswerB;
	if (mathAnswerB != 3)
	{
		cout << "That is incorrect! 20% has been deducted from your score.\n\n";
	}
	else
	{
		cout << "That is correct!\n\n";
	}

	// Question C.
	const string mathMessageC = "What is 5-5?\n\n";
	int mathAnswerC;

	cout << mathMessageC << endl;
	cout << "1. 22\n";
	cout << "2. 48\n";
	cout << "3. 4\n";
	cout << "4. 0\n";
	cin >> mathAnswerC;
	if (mathAnswerC != 4)
	{
		cout << "That is incorrect! 20% has been deducted from your score.\n\n";
	}
	else
	{
		cout << "That is correct!\n\n";
	}

	// Question D
	const string mathMessageD = "Pick an equation that equals 0. Two could be right.\n\n";
	int mathAnswerD;

	cout << mathMessageD << endl;
	cout << "1. 0x0\n";
	cout << "2. 1+8\n";
	cout << "3. 75-75\n";
	cout << "4. 100+48\n";
	cin >> mathAnswerD;
	if (mathAnswerD != 1 && mathAnswerD != 3)
	{
		cout << "That is incorrect! 20% has been deducted from your score.\n\n";
	}
	else
	{
		cout << "That is correct!\n\n";
	}

	// Question E.
	const string mathMessageE = "Pick the two equations that equal 20.\n\n";
	int mathAnswerE1;
	int mathAnswerE2;

	cout << mathMessageE << endl;
	cout << "1. 5x4\n";
	cout << "2. 1+8\n";
	cout << "3. 20x1\n";
	cout << "4. 100+48\n";
	cin >> mathAnswerE1;
	cin >> mathAnswerE2;
	if (mathAnswerE1 != 1 || mathAnswerE1 != 3 && mathAnswerE2 != 1 || mathAnswerE2 != 3)
	{
		cout << "That is incorrect! 20% has been deducted from your score.\n\n";
	}
	else
	{
		cout << "That is correct!\n\n";
	}

}

[chicofeo]

you need to add the Function prototypes (Because your first function is main) like this:

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

//Function Prototypes.
void geographyQuiz();
void basicMathQuiz();
void randomTriviaQuiz();

Then take a look at lines 19-30. When you call the function, you do not put the function type. For example:

    if (quizSelection == 1)
    {
	   geographyQuiz(); // Delete the function type (void), when calling functions.
    }
    else if (quizSelection == 2)
    {
	   basicMathQuiz(); // Same here.
    }
    else if (quizSelection == 3)
    {
	   randomTriviaQuiz(); // Same here.
    }

PS: It looks that you figured it out. Great!

[CopaceticCoffee]

Thanks for your advice! It's funny, I tried adding function prototypes and I solved my problem and then I noticed that you replied and told me to do exactly what I did!

[chicofeo]

It does feel better when you can figure it out on your own, though. Good job!!!