Help deleting a line from a file (fstream)

[dualdark]

Hello everyone. I need to delete a specific line from notas.dat, but instead of that, my code deletes everything but the line i input...

For example.. i have this...

Sucursal Nota
1 2
1 3
1 4
2 1
2 2

I input Sucursal 1, Nota 3.

void notas::borrar(){
	int num,num2;
	fstream fp,fp2;
	notas nota;
	cout << "Sucursal";cin >> num;cout << "Numero de nota: ";cin >> num2;
	fp.open("notas.dat",ios::in|ios::out);
	fp2.open("temp.dat",ios::out);
	fp.seekg(0,ios::beg);
	    while(fp.read((char*)&nota,sizeof(notas))){
		if((nota.retnumnota()==num2) && (nota.retsucursal()==num)){
        cout << nota.retsucursal() <<" " <<nota.retnumnota() <<" " <<num <<" " << num2;
        system("pause");
        fp2.write((char*)&nota,sizeof(notas));
		}
	}
	fp.close();
    fp2.close();
    remove("notas.dat");
    rename("temp.dat","notas.dat");
    cout<<endl <<"Nota borrada." <<endl;
    system("pause");
}

output

Sucursal Nota
1 3

I suppose the problem is in the condition... but not really sure..

Thanks in advance.

[keskiverto]

if ( R2D2 && C3PO )
{
  These are the droids that we are looking for.
}
else
{
  Move along!
}

More compactly, when is ! ( Foo && Bar ) true?

[dualdark]

I dont understand =(

[Chervil]

I suppose the problem is in the condition... but not really sure..

you just need to take the opposite of the condition.

Instead of

if (condition)
    do something

try

if (!condition)
    do something

[dualdark]

I already tried... but didn't work either... when i do that, it deletes all -sucursal- started with 1

_____________________________-


nvm... i made it work following your idea... thank you very much