x.txt besteht aus

1
2
3
4
5

und der c++ code ist:

#include<iostream>
#include<vector>
#include<fstream>
#include<string>

using namespace std;

int main(){

ifstream xdata; 
xdata.open("x.txt");

string line;
int x;

while(getline(xdata,line))
{
xdata >> x;
cout << x;
}

xdata.close();

cout << endl;
}

while(xdata >> x)
{
 cout << x;
}