If/Else Help

[CopaceticCoffee]

I am creating a geography test with a menu system. I'm using if/else statements to either ask the user to re-submit their answer or move on to the next question. When I ran the code, it only asked the first question. After I entered the correct answer, it didn't move on to the next question. I'm probably making a simple mistake but I can't seem to figure out what I'm doing wrong. Any help is appreciated!

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

int main()
{
	// 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?\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 answerE;

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


	cin.get();
	return 0;

}

[AbstractionAnon]

Worked fine for me as long as I entered the correct answers (subject to the below comments):

Lines 27-32: If you enter the wrong answer, you prompt for the answer again, but ignore whatever is entered.

Line 81: That if statement is not going to work as you expect. If answerD is 1 (correct), answerD != 3 will be true, and you will display "incorrect answer".

Line 99: Instructions say enter TWO letters. You're reading one number.

I'd suggest using a function to get the correct answer.

void get_correct_answer (int correct_ans)
{   int ans;

    while (1)
    {   cin >> ans;
        if (ans == correct_ans)
        {   cout << "That's correct" << endl;
            return;
        }
        cout << That's incorrect" << endl;
    }
} 

That way, you can get rid of your nested ifs.
Doesn't handle multiple answers though (not that your logic is correct for multiple answers).

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

	cout << questionA;
	cout << "1) South America\n";
	cout << "2) Europe\n";
	cout << "3) Asia\n";
	cout << "4) North America\n\n";
	get_correct_answer (2);

	// Question B.
	const string messageB = "B. What is the capital of Canada?\n\n";

	cout << messageB;
	cout << "1) Vancouver, BC\n";
	cout << "2) Calgary, AB\n";
	cout << "3) Ottawa, ON\n";
	cout << "4) Toronto, ON\n\n";
	get_correct_answer (3);