File IO

I have created a file(file.dat) and have written the following 3 lines.Later i want to delete the second line in the following way-but this is not happening. When i open the file some garbage is being shown and i see no lines which was written at the starting.May i know where i am wrong?

Code:

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ofstream fout("file.dat",ios::out);
    fout << "Sunanda 5 \n";
    fout << "Rahool 10 \n";
    fout << "Sunetra 12 \n";
    fout.close();
    
    ofstream fapp("file.dat",ios::out);
    fapp.seekp(23);
    int i = 0;
    while(i < 11)
    {
            fapp << '\b';
            i++;
    }        
    fapp.close();
    system("pause");                   
}

Thera are a couple of mistakes in your code.
First of all

Code:

ofstream fapp("file.dat",ios::out);

truncates the file. So the following code operates on an empty file.
you would have to use

Code:

ofstream fapp("file.dat",ios::out|ios::app);

In that case the file would not be cleared when opened.
But I guess that the effect would still not be what you want. Your code would just append a series of backspace characters to the end of the file.
If you want to remove a line from the file you have to read in the complete file and write it again without the line that you want to remove.
Kurt