Xcode problem

[smg443]

Trying to start using xcode but i have a small problem.

Some code to make sure it reads files in correctly:

#include <iostream>
#include <fstream>

using namespace std;

int main()
{ ifstream infile;
    char num1,num2,num3,num4;
    
    infile.open("test.txt");
    if(infile.fail()){
      cout<<"Failed to open file";
      exit(1);
    }
    infile>>num1>>num2>>num3>>num4;
    
    cout<<num1<<num2<<num3<<num4;
    return 0;
}

Input:

6
7
8
9

Output:

6789

Now my problem is on line 8. My input file is integers but it reads and gives the correct output even if I define them as a char or string. I'm using TextEdit to make the input file and saving it as a plain text file. Anyone know of a way to correct this?