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Copy from one file to another

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Join Date: Nov 2007

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ENG ISE student ENG ISE student is offline

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Copy from one file to another

Dec 20th, 2007

So I'm supposed to copy the word "computer" or "computers" from the text of one file and past the word each time to the new file. It compiles but it doesnt run right. Any input would be great.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
#include <fstream>
#include <cstring>
 
using namespace std;
 
int main()
{
        char filename, filename2, word[20]; //char to read the input and output files as well as word from the file
        ofstream fout;//output file
        ifstream fin;//input file
 
        cout << "Enter you input file:";
        cin>>filename;//stores the input filename
 
        fin.open("filename");//open input file
 
        cout << "Enter your output filename";
        cin>>filename2;//stores output filename
 
        do
        {
                if(strcmp("COMPUTER", word) || strcmp ("COMPUTERS", word))//looks for both computer and computers in file
                {
 
                fout.open ("filename2");//open output file
                fout<<word;//prints the word in the output file
                }
 
        }while(word);
 
        fin.close();//closes input file
        fout.close();//closes output file
return 0;
}
#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

int main()
{
        char filename, filename2, word[20]; //char to read the input and output files as well as word from the file
        ofstream fout;//output file
        ifstream fin;//input file

        cout << "Enter you input file:";
        cin>>filename;//stores the input filename

        fin.open("filename");//open input file

        cout << "Enter your output filename";
        cin>>filename2;//stores output filename

        do
        {
                if(strcmp("COMPUTER", word) || strcmp ("COMPUTERS", word))//looks for both computer and computers in file
                {

                fout.open ("filename2");//open output file
                fout<<word;//prints the word in the output file
                }

        }while(word);

        fin.close();//closes input file
        fout.close();//closes output file
return 0;
}

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Join Date: Mar 2006

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dubeyprateek dubeyprateek is offline

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Re: Copy from one file to another

Dec 20th, 2007

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
 do
        {
                if(strcmp("COMPUTER", word) || strcmp ("COMPUTERS", word))//looks for both computer and computers in file
                {
 
                fout.open ("filename2");//open output file
                fout<<word;//prints the word in the output file
                }
// read the word here from the input file in 'word'
        }while(word);//curently it is a bad loop
 do
        {
                if(strcmp("COMPUTER", word) || strcmp ("COMPUTERS", word))//looks for both computer and computers in file
                {

                fout.open ("filename2");//open output file
                fout<<word;//prints the word in the output file
                }
// read the word here from the input file in 'word'
        }while(word);//curently it is a bad loop

is not doing the job. You need to read word by word and then compare. Also there is no need re opening the output file fout.open ("filename2");//open output file .
You can find several examples in this forum on how to read a word from a file.

-Prateek

Last edited by Ancient Dragon; Dec 20th, 2007 at 6:21 pm. Reason: corrected icode tag syntax

I know I am. Therefore I am.

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Join Date: Dec 2007

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yagiD

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Re: Copy from one file to another

Dec 20th, 2007

There are errors in reading from and writing to a file and do-while results in an infinite loop.

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Join Date: Aug 2005

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Ancient Dragon Ancient Dragon is offline

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Still Learning

Re: Copy from one file to another

Dec 20th, 2007

>> char filename, filename2, word[20];
You are attempting to tread char as if it were std::string. My suggestion is to get rid of those c-style character arrays and use the easier-to-use std::string instead

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
std::string filename, filename2, word;
 
...
      cout << "Enter your output filename";
      getline(filename2,cin);//allow filename to contain spaces
      ofstream out(filename2.c_str());
      while( fin >> word)
      {
          if( word == "COMPUTER" || word == "COMPUTERS")
              fout << word;
 
      }
std::string filename, filename2, word;

...
      cout << "Enter your output filename";
      getline(filename2,cin);//allow filename to contain spaces
      ofstream out(filename2.c_str());
      while( fin >> word)
      {
          if( word == "COMPUTER" || word == "COMPUTERS")
              fout << word;

      }