Here is my code:

#include<iostream>
#include<string>
#include<cstring>
#include<string>
#include<fstream>
#include<vector>
#include"input.h"
#include<cmath>
#include<wchar.h>
using namespace std;

void Challenge1(vector<string>& vData);

int main(vector<string>& vData)
{
    do
    {
        system("cls");
        
        switch (toupper(inputChar("ntSelect an option: ", "ABCX")))
        {
        case 'X': exit(1); break;
        case 'A': Challenge1(vData); break;
        //case 'B': Challenge3(); break;
        //case 'C': Challenge6(); break;
        default: cout << "ttERROR - Invalid option."; break;
        }
        cout << "n";
        system("pause");
    } while (true);

}

void Challenge1(vector<string>& vData)
{
    ifstream inputFile;

    string filename = inputString("ntEnter a data file (Triangles.TXT): ", true);
    inputFile.open(filename);

    if (inputFile.fail())
    {
        cout << "ntERROR: " << filename << " cannot be found.n";
        return;
    }

    vData.clear();

    string value;
    while (inputFile >> value)
    {
        vData.push_back(value);
    }

    inputFile.close();

    cout << "ntCompleted reading data from file and stored into array.n";
}

I’m trying to read a text file (has number) and store it in a vector so I can display it later in the option menu (Case B). But it crash whenever I tried to run (store) the text file.

I still have a lot to learn, any help is much appreciated.