c++ writing to a .txt file

xemous · 09-01-2004, 10:13 PM

i need to write charactors and intergers to a txt file, then read back of the txt file

im new to c++ and know some basics

but i need some example of this, or a url linking to an example would be appreciated

R00ts · 09-01-2004, 10:15 PM

I don't know of any good URLs to link, but did you try looking yourself? I just googled for "C++ File IO" and found a plethora of links to examples. I recommend you use the power of self-searching

xemous · 09-01-2004, 10:18 PM

http://www.cplusplus.com/doc/tutorial/tut6-1.html

im currently looking at this atm

im looking for a simple tutorial that explains how to read and write charactors and intergers of a txt file, and the ones iv found are difficult to follow

programming is not my thing, but i have not choice here i need to figure out how this portion works

leonscape · 09-01-2004, 10:18 PM

Text writing is very simple.

Code:

#include <iostream>
#include <fstream>

int main()
{
   ofstream out( "textfile.txt" );
   if( !out )
   {
      cout << "Couldn't open file."  << endl;
      return 1;
   }

   out << "This is output to the file.\n";

   out.close();

   return 0;
}

This is pretty basic but you get the idea.

xemous · 09-01-2004, 10:20 PM

what compiler did you use?

leonscape · 09-01-2004, 10:23 PM

I used GCC.

Edit: I missed out "using namespace std;" also GCC is misleading as you call g++.

xemous · 09-01-2004, 10:49 PM

hi again

i played with some examples and i have new question

#include <iostream>
main()
{

char ch[120];
int u;

std::cin >> ch;
std::cin >> u;

std::cout << ch << u;

int x;
std::cin >>x;
return 0;
}

here is a simple program which takes some char and int

#include <fstream.h>
#include <iostream>
int main () {
ofstream examplefile ("customer.txt");
if (examplefile.is_open())
{

examplefile << "This is a line.\n";
examplefile << "This is another line.\n";
examplefile.close();
}
return 0;
}

here is a program which just writes to text file

how would you express, if the programs were merged, to write the char ch, and the int u , into the example text file

i tried the obvious newbie

examplefile << ch;
examplefile << u;

but i got a compile errors

is there another way?

leonscape · 09-01-2004, 10:53 PM

What where the compiler errors?

xemous · 09-01-2004, 10:57 PM

leonscape
thanks for help mate
sorry about that, it rewrote the program more carefully and it compiled correctly

here is the new verison

#include <iostream>
#include <fstream.h>
int main()
{
char ch[120];
int u;

std::cin >> ch;
std::cin >> u;

std::cout << ch << u;
ofstream examplefile ("customer.txt");
if (examplefile.is_open())
{

examplefile << ch;
examplefile << u;
examplefile.close();
}
return 0;
}