Review for Linked Lists and Doubly Linked Lists

#include "LinkedLists.h"

int static counter = 0;
int static total = 0;
char input;
char answer;
string typedInput;
string typedAnswer;
bool correct;

bool checkCharAnswers(char input, char answer);
bool checkStringAnswers(string typedInput, string typedAnswer);
void counting(bool correct);
void charMessage(bool correct, char answer);
void stringMessage(bool correct, string typedAnswer);
void displayResult(int counter, int total);

void question1();
void question2();
void question3();
void question4();
void question5();


int main()
{
cout << "WELCOME to the review for Linked Lists and Doubly Linked Lists" <<
endl;
cout << "If you find any errors or have any ideas to better improve my code,
please let me know. I might not have spent a million hours putting this together."
<< endl << endl;
cout << "NOTE: Be wary that by using strings to hold standard input, whitespace
is also taken into consideration when comparing answers. Always check the outputted
answer when the program claims your answer was 'wrong'" << endl << endl;
cout << "P.S. Each question will specify what file you should/can look at to
guide your answers" << endl << endl << endl;

question1();

// counter++;
// cout << "Type the letter for your answer... ";
// cin >> input;
//
// correct = checkCharAnswers(input, answer);
// counting(correct);
// charMessage(correct, answer);
//
//
// cin.ignore();
// getline(cin, typedInput);
//
// counter++;
// correct = checkStringAnswers(typedInput, typedAnswer);
// counting(correct);
// stringMessage(correct, typedAnswer);
}

void question1()
{