Reading integers from file into array

[GhqjLyTq]

So I'm trying to write a program that will read some integers from a text file, sort them, then write the sorted array into another text file. It is sorting and writing them into a file, but it won't read them from a file. I can't use getline() since I'm using integers. Here's my code, anyone know how to get it to read integers from a file into an array, instead of the array being initialized with the integers?

#include <iostream>
#include <Windows.h>
#include <stdlib.h>
#include <fstream>
#include <string>
#include <stdio.h>
using namespace std;
void selectionSort(int arr[], int size); 
void swap(int& x, int& y); 
int main() 
{ 
     int numbers[] = { 13, 5, 1, 7, 9, 11, 3, 17, 19, 15, 234 }; 
     int maximum = sizeof( numbers ) / sizeof( numbers[0] );
     int k; 
     selectionSort(numbers, maximum); 
     ofstream output;
     output.open("sorted.txt");
     for (k = 0; k < maximum; k++) 
     output << numbers[k] << "\n"; 
     output.close();
     system("sorted.txt"); 
     return 0; 
}
void selectionSort(int arr[], int size) 
{ 
     int indexOfMin, pass, j; 
     for (pass = 0; pass < size - 1; pass++) 
     { 
           indexOfMin = pass; 
           for (j = pass + 1; j < size; j++) 
                 if (arr[j] < arr[indexOfMin]) 
                       indexOfMin = j; 
           swap(arr[pass], arr[indexOfMin]); 
     } 
}
void swap(int& x, int& y) 
{ 
     int temp; 
     temp = x; 
     x = y; 
     y = temp; 
}

[Zhuge]

Have you tried to actually code reading the numbers from the file? What kinds of problems are you having when you attempt to do that?