Re: [Dev-C++] What lib should i be using instead?

[Luigi S. <gi...@li...>]

Hi Brian !
I'm not sure if the function "itoa" is ANSI C++; just in case it is not I 
included a "small" version of it.

This code might do what you expect:

test.cpp
---
// main is just to let me test the code

#include <fstream.h>
#include <string>
#include <algorithm>

string
itoa(int n);

//////////////////////////////////////////////////////////////////////

int
main()
{
    int number = 15;
    string filename = "help";
    ofstream data;

    filename += itoa(number); // append the integer
    data.open(filename.c_str()); // see STL help file for c_str()

    data << "this string goes in the file: \"" << filename << "\"\n";

    return 0;
}

//////////////////////////////////////////////////////////////////////

// convert a non-negative integer to a string

string
itoa(int n)
{
    string s; // the number as a string

    if (n >= 0) // convert
    {
       do
          s += '0' + n % 10; // add in reverse order
       while (n /= 10);

       reverse(s.begin(), s.end()); // set in the right order
    }

    return s;
}

At 18.42 28/07/01 +0200, you wrote:
>I am not all to familiar with the string class that you are using, but
>"filename += number" may not do what you think.
>
>try this instead:
>
>//
>string filename = "help";
>int number = 0;
>filename += itoa(number); // convert int to char before appending it to
>string.
>cout << "{"  << filename << "}" << endl;
>//
>
>You will now see that a space is added between filename and number. This
>character position is to represent a minus sign if number is negative. Your
>string class will probably have a function to get rid of this character.
>
>----- Original Message -----
>From: "Brian Puz" <BP...@go...>
>To: <Dev...@li...>
>Sent: Saturday, July 28, 2001 12:30 AM
>Subject: [Dev-C++] What lib should i be using instead?
>
>
> > I am using G++/string and fstream.h and am unable to open a file using a
>string. I want to dianamically create file names and would prefer to do this
>without char[].
> >
> > int number;
> > string filename = "help";
> > ofstream data;
> >
> > filename += number;
> > data.open(filename);
> >
> >
> >
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gisan
gi...@li...