a simple question about files

I am learning files in c++.
I wrote this program .

Code:

---

#include <fstream.h>
#include <iostream.h>
struct st{
char name[21];
int age;}test;
int main(){
int i;
ofstream fp("myfile.txt");
if(!fp){
  cout << "error";
  return 0;}
for(i=0;i<3;++i){
  cin>>test.name;
  cin>>test.age;
  if(test.age>30)
    fp.write((char*)&test,sizeof(struct st));}
fp.close();
return (0);}

---

my problem is when I check the file (myfile) after running this program there is no age in it .
for example if I enter 40 the program get it as aski code and write '(' instead of 40 in the file .
what can I do?

my another question is : if I have c++ compiler in "c:\bin" is it possible to make the file in another place for exampl in D drive ?

tnx

i can only answer your second question. of course you can unless you have a really crappy compiler which i doubt. by the way, which compiler are you running?

it is an old one .
dont laugh at me .
when I started learning c++ some one told me borland 3.1 is the best for getting start and therefore I installed it .

get dev-c++, a links on this site but i'll give it to you anyways www.bloodshed.net download it for free, really good

thanks

Code:

---

fstream openf;
string filename;
......... .........
filename="c:\ooo\111\222\defa.ooo";
..........
openf.open(filename.c_str(),fstream::in|fstream::out);

---

thanks alot , but what about my first question ?

you can put yout input directly into file,do not use struct

I know that way but but if I have to use struct ?

change this:

sizeof(struct st)

to this:

sizeof(test)

and see if that clears up your problem. The write method will write to the file in binary, which will probably show up as hexadecimal symbols when you try to view the file. If so you will need to read the file back to your program to see if it has the correct information in it.

> for example if I enter 40 the program get it as aski code and write '(' instead of 40 in the file .
Well that's what you get for writing binary data rather than text

If you want to read it properly, do
fp << test.name << " " << test.age << endl;

thank you all .

Quote:

---

Originally Posted by Hermitsky

Code:

---

fstream openf;
string filename;
......... .........
filename="c:\ooo\111\222\defa.ooo";
..........
openf.open(filename.c_str(),fstream::in|fstream::out);

---

---

I think you meant

Code:

---

filename="c:\\ooo\\111\\222\\defa.ooo";

or

filename="c:/ooo/111/222/defa.ooo";

---

A single backspace in a C\C++ string represents an escape sequence, there fore will not get the expected result even if your compiler lets it compile.

You could also do this

Code:

---

bool WriteToFile ( const char *file_name )
{

    ostream the_file ( file_name );

    // Check if it opened/existed
    if ( !the_file.is_open () ) {

        // if it didnt
        return false;

    }

    // write to it

    the_file.close ();
    return true;

}

// to use the function

int main ()
{

    if ( !WriteToFile ( "C:/MyFile.txt" ) )
        exit ( 1 );

    return 0;

}

---

That should give you a rough idea of things you can do. ;)