C++ ONLY! Hi! Need help completing the final part of this project, wherein a use

Question

C++ ONLY!

Hi! Need help completing the final part of this project, wherein a user inputs a word to search for with the wildcard character (for example, the user inputs "a??" to search, and I must output ANY matching word in the file (for example, "And appears 3 times in the file"). I've attached the code that I've written to do this part of the program, but it IS NOT WORKING EXACTLY. I need someone to correct my program for me so that my program outputs the correct count. I have also included a pastebin link to my entire program: https://pastebin.com/hJpSsfER. Please help me! Thank you!

Explanation / Answer

#include <iostream>
#include <string>
#include <cctype>
#include <fstream>

using namespace std;

int countWords(const char *);
int countUnique(const char *);
void compareInput(const char*, string);
void printResults(string, string, int);

int main(int argc, char **argv) {
   if (argc != 3) {
       cout << "Proper usage ./ sample.txt query.txt" << endl;
       return 0;
   }
    //opens file to read from
   ifstream inFile(argv[1]);
    //stream for output file
    ofstream outFile;
    outFile.open("outFile.txt");
   string word;
    while (inFile >> word) {
        //loop to convert to lower case and remove punctuation
        for (unsigned int i = 0; i < word.length(); i++) {
            word[i] = tolower(word[i]);
            if (ispunct(word[i]) || (!isalpha(word[i]))) {
                    word[i] = ' ';
            }      
              
        }
        word += " ";
        //outputs the clean strings to a new file
        outFile << word;
    }
   inFile.close();
    outFile.close();
    const char *clean = "outFile.txt";
//    const char *found = "found.txt";
    int count = countWords(clean);
   cout << "The number of words found in the file was " << count << endl;
   int uniqueCount = countUnique(clean);
   cout << "The number of unique words found in the file was " << uniqueCount << endl;
    string input;
    //loop that keeps getting user input and searching for it till a certian input
   while (input != "^C") {
       cout << endl << "Please enter a word: ";
       cin >> input;
        compareInput(clean, input);
   }
   return 0;
}

//counts how many words are in the file
int countWords (const char *fp) {
    int count = 0;
    string word;
    ifstream file;
    file.open(fp);
    while (file >> word) {
        count ++;
    }
    file.close();
    return count;
}  

//counts how many unique words are in the file
int countUnique(const char *fp) {
   int count = 0, check = 0, p = 0;
    string word;
    string wordbank[10000];
    ifstream file;
    file.open(fp);
    while (file >> word) {
        wordbank[p] = word;
        for (int i = 0; i < 10000; i++) {
            if (word == wordbank[i]) {
                cout << word << " " << wordbank[i] << endl;
                check++;
            }
        }  
        p++;
        if (check == 1) {
            cout << word << endl;
            count++;
        }
        check = 0;
    }  
    file.close();
    return count;
}

//counts how many times the user input occurs in the file
void compareInput (const char *fp, string input) {
    unsigned int check = 0, count = 0;
    string word;
    string wordFound;
    ifstream file;
    file.open(fp);
    while (file >> word) {
        for (unsigned int i = 0; i < input.length(); i++) {
            //if the input matches the word or input is a question mark incrament check
            if ( (input[i] == word[i]) || (input[i] == '?') ) {
               check++;
           }
            //if the check is equal to input length add word to wordFound and incrament count
            if ( (check == input.length()) && (input.length() >= word.length() ) ) {
                wordFound = word;
                count++;
            }  
       }
        check = 0;
    }  
    file.close();
    //print results with another function
    printResults(wordFound,input,count);
}  

//function to print the results
//does not work for multiple words but works for 1
void printResults (string wordFound, string input, int count) {
    if (count == 0) {
        cout << endl << "The word " << input;
        cout << " appears " << count << " times in the document" << endl << endl;
    }  
    else if (count == 1) {
        cout << endl << "The word " << wordFound;
        cout << " appears " << count << " time in the document" << endl << endl;
    }
    else {
        cout << endl << "The word " << wordFound;
        cout << " appears " << count << " times in the document" << endl << endl;
    }   
}

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