I'm not sure why a function isn't replacing a vector element

[frank grove]

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[crimson orbit]

#include <iostream>
#include <conio.h>
#include <windows.h>
#include <algorithm>
#include <vector>
using namespace std;

void showBoard(vector<string> values)
{
    cout << values[0] << "|" << values[1] << "|" << values[2] << endl
         << "------------" << endl
         << values[3] << "|" << values[4] << "|" << values[5] << endl
         << "------------" << endl
         << values[6] << "|" << values[7] << "|" << values[8] << endl
         << "------------" << endl
         << endl;
}

void checkXPos(int xPos, vector<string> values)
{
    switch (xPos)
    {
    case 1:
        values[0] = " X ";
        break;
    case 2:
        values[1] = " X ";
        break;
    case 3:
        values[2] = " X ";
        break;
    case 4:
        values[3] = " X ";
        break;
    case 5:
        values[4] = " X ";
        break;
    case 6:
        values[5] = " X ";
        break;
    case 7:
        values[6] = " X ";
        break;
    case 8:
        values[7] = " X ";
        break;
    case 9:
        values[8] = " X ";
        break;
    default:
        break;
    }
}

void tictactoe()
{
    system("CLS");

    int xPos = 0;
    vector<string> values = {" 1 ", " 2 ", " 3 ", " 4 ", " 5 ", " 6 ", " 7 ", " 8 ", " 9 "};

    showBoard(values);

    cout << "Where do you want to place your X?" << endl;
    cin >> xPos;
    cout << endl;

    checkXPos(xPos, values);
    showBoard(values);

    Sleep(5000);
}

When I'm entering a value, it shows the normal table, without the specific number being replaced by "X" for example

Here's a pic

Nvm I just realized I didnt pass it as reference lol

!solved

[frank grove]

[SOLVED] I'm not sure why a function isn't replacing a vector element

[frank grove]

I'm not sure why a function isn't replacing a vector element