How do I extract specific words from a string in a text file?

my assignment is to take a string from a text file and count the number of words in it. I've gotten that far but now we have to be able to take a certain number and display that number word to the console. Say my string is "Hello World" if I enter '2' it should give me the result "World". I'm not really sure how my function should look for this. This is my code so far.

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  void getFileInfo(ifstream &inFile);
string words(ifstream &inFile);
int numOfWords(ifstream& inFile);


int main() {

    ifstream inFile;
    string sentence, fileName;
    int numCount, word;

    getFileInfo(inFile);
    numCount = numOfWords(inFile);
    inFile.clear();  // resets file pointer from the beginning
    inFile.seekg( 0 );
    sentence = words(inFile);

    cout << sentence << ": has " << numCount << " words in it" << endl;
    cout << "Enter a number to extract a word: ";
    cin >> word;


}

void getFileInfo(ifstream &inFile){

    string fileName;

    do{

        cout << "Please enter the filename: " << endl;
        cin >> fileName;

        inFile.open(fileName.c_str());

        if(!inFile){

            cout << "Invalid try again" << endl;

        }
    }while(!inFile);

}

string words(ifstream &inFile){

    string words, theWords;

    getline(inFile, words);
    cout << words;



    return theWords;

}

int numOfWords(ifstream& inFile){

    string fileName, words, str;
    int numCount =0;

    while(inFile >> words){
        ++numCount;
    }

    return numCount;


}
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    sentence = words(inFile);
    cout << sentence << ": has " << numCount << " words in it" << endl;
¿what does the `words()' function do?


> take a certain number and display that number word to the console
> I'm not really sure how my function should look for this.
«pass me the third book on the shelf»
¿can you write a pseudocode for that?
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#include <iostream>
#include <fstream>
#include <string>
using namespace std;



void getFileInfo(ifstream& inFile);
void words(ifstream& inFile);
int numOfWords(ifstream& inFile);
string numWord(ifstream& inFile, int a);

int main() {

	ifstream inFile;
	string sentence, fileName;
	int numCount, word;

	getFileInfo(inFile);
	numCount = numOfWords(inFile);
	inFile.clear();  // resets file pointer from the beginning
	inFile.seekg(0);
	words(inFile);

	cout  << ": has " << numCount << " words in it" << endl;
	cout << "Enter a number to extract a word: ";
	cin >> word;

	inFile.clear();  // resets file pointer from the beginning
	inFile.seekg(0);

	string test = numWord(inFile, word);
	cout << test;

	return 0;
}

void getFileInfo(ifstream& inFile) {

	string fileName;

	do {

		cout << "Please enter the filename: " << endl;
		cin >> fileName;

		inFile.open(fileName.c_str());

		if (!inFile) {

			cout << "Invalid try again" << endl;

		}
	} while (!inFile);

}

void words(ifstream& inFile) {

	string words, theWords;

	while (getline(inFile, words)) {
		cout << words;
	}


}

int numOfWords(ifstream& inFile) {

	string fileName, words, str;
	int numCount = 0;

	while (inFile >> words) {
		++numCount;
	}

	return numCount;


}

string numWord(ifstream& inFile, int a) {

	string fileName, words;
	int numCount = 0;

	while (inFile >> words) {
		++numCount;
		if (numCount == a) {
			return words;
		}
	}

	return "Word not found";


}
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