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Help? reading from one file to another...

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Join Date: Oct 2008

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Help? reading from one file to another...

Oct 8th, 2008

Hi. I'm new here and would appreciate any help you can give me.

I am a college student and I'm supposed to do this assignment where I take data from one txt file and put it into another. This is step one of a larger project. I have some code done but it's not that good. The infile is data for grocery receipt tape with five pieces of data across it. I have the outfile creating itself but it only contains zero's- three of them for each variable I created? How do I specify what to read from the infile? I need to read the first three of the five items. Thanks!

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#include <iostream>
#include <fstream>
#include <cstdlib> 
 
using namespace std;
 
int item_number, item_name, unit_price; //declaring variables
 
int main()
 
{ 
 
ifstream indata;
indata.open("data.txt",ios::in); // opens the infile 
ofstream outdata;
outdata.open("YourLastName_YourFirstName.txt",ios::out); //opens the outfile
outdata<<item_number<<item_name<<unit_price;
indata.close (); //closes the infile
outdata.close (); // closes the outfile
 
return 0;
 
}
#include <iostream>
#include <fstream>
#include <cstdlib> 

using namespace std;

int item_number, item_name, unit_price; //declaring variables

int main()

{ 

ifstream indata;
indata.open("data.txt",ios::in); // opens the infile 
ofstream outdata;
outdata.open("YourLastName_YourFirstName.txt",ios::out); //opens the outfile
outdata<<item_number<<item_name<<unit_price;
indata.close (); //closes the infile
outdata.close (); // closes the outfile

return 0;

}

Last edited by Ancient Dragon; Oct 8th, 2008 at 7:50 am. Reason: add code tags

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Salem

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Re: Help? reading from one file to another...

Oct 8th, 2008

You could help us by reading the forum rules on how to post code

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stilllearning stilllearning is offline

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Re: Help? reading from one file to another...

Oct 8th, 2008

Well, you should be checking to see if your file pointers are valid or not before proceeding.

And you need to read the data from your infile before you can write it to your outfile. You can have a counter that counts how many elements you are reading from your infile, and write them to the outfile.

Ah yes and what Salem just said

Last edited by stilllearning; Oct 8th, 2008 at 2:12 am.

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Join Date: Oct 2008

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Re: Help? reading from one file to another...

Oct 8th, 2008

Thanks guys or gals. I did read around last night but I missed the code tag part. Sorry! So, I'm still working on this today. I added the error code for the file open and found out that I had assigned the incorrect file name so it wasn't opening correctly. Now, I just need to get the right thing read and I am in business!

Last edited by Student_ABC; Oct 8th, 2008 at 9:26 am.