Working With Multi Files

#include<iostream.h>
#include<fstream.h>
using namespace std;
int main()
{
    ofstream file;
    file.open("TEST.txt",ios::ate);
    file<<"Suraj Kumar Jana\n";
    file<<"\n\n";
    file<<"I like Computer Science";
    int p= file.tellp();//finding the size of a file
    cout<<"Size of the file is :"<<p;
    cout<<"\n\n\n\n";
    file.close();
    const int N=80;
    char line[N];
    ifstream inf;
    inf.open("TEST.txt");
    while(inf)
    {
        inf.getline(line,N);
        cout<<line<<"\n";
    }
    inf.close();
    return 0;
}