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i gave up! anyone knows "ofstream"

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Join Date: May 2009

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Reputation: apo is an unknown quantity at this point

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apo

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i gave up! anyone knows "ofstream"

-1

Nov 1st, 2009

Hi, I'm trying to create a quick and small programs that works when you press F9, it should create files on my desktop using "ofstream" from A to Z. I can't get it to run when i put ofstream in a for cycle. Here is the code to see it better.

#include <cstdlib.h>
#include <iostream.h>
#include <conio.h>
#include<fstream.h>
//------------------
void main()
{
int i;
char letras[3];
letras[0]='a';
letras[1]='b';
letras[2]='c';

for(i=0;i<3;i++)
ofstream print(letras[i]);

}

thanks you so much for any help.

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Join Date: Aug 2005

Posts: 15,571

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Ancient Dragon Ancient Dragon is offline

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Still Learning

-7

Nov 1st, 2009

The parameter to open() has to be a null-terminated character array (commonly called a string). All you are trying to send it is a single character. Try this:

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(Toggle Plain Text)

int main()
{
int i;
char* letras[3] = {"a","b","c"};

for(i=0;i<3;i++)
{
    ofstream print(letras[i]);
}

}

Last edited by Ancient Dragon; Nov 1st, 2009 at 10:15 am.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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Join Date: Sep 2008

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BeyondTheEye BeyondTheEye is offline

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Junior Poster in Training

Nov 1st, 2009

An ofstream is an object, not a function.
To open a file using ofstreams you first create the object, then open the file. Like so:

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 CPP Syntax (Toggle Plain Text) 
ofstream file;
file.open("a.txt");
//Do something
file.close();
ofstream file;
file.open("a.txt");
//Do something
file.close();

In your case you could place it in a loop. You'll have to make a string object to get the name of the file right.
Oh, the open function requires a cstring, not a standard string.

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Join Date: May 2009

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Reputation: apo is an unknown quantity at this point

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apo

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Newbie Poster

Nov 1st, 2009

thanks for the help! it solved my problem.

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Join Date: Oct 2009

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Reputation: niXman is an unknown quantity at this point

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niXman

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Nov 1st, 2009

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <fstream>
#include <string>
int main() {
   for ( char ch = 'A'; ch <= 'Z'; ch++ ) {
      std::string fn = ch + std::string(".txt");
      std::ofstream file(fn.c_str());
   }
   return 0;
}
#include <fstream>
#include <string>
int main() {
   for ( char ch = 'A'; ch <= 'Z'; ch++ ) {
      std::string fn = ch + std::string(".txt");
      std::ofstream file(fn.c_str());
   }
   return 0;
}