Store first n natural no in a file - c program, C/C++ Programming

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Program is to store first n natural no in a file:

Write a program to store first n natural no in a file

void main()

{

fstream file;

file.open("student.dat",ios::in|ios::out|ios::app);

int n;

cout<<" enter record to be modified ";

cin>>n;

file.seekg((n-1)*sizeof());

file.read((char *)& ,sizeif());

file.write((char *)& ,sizeof());

file.close();

}

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