question about file handling copy data from one text file to another

Question

3.40/5 (2 votes)

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C++

#include <iostream.h>
#include <fstream.h>
#include <conio.h>
void main()
{
    clrscr();
    char ch;
    ifstream infile;
    ofstream outfile;
    infile.open("edf.txt");

    outfile.open("ew.txt");

    while(!infile.eof())
    {
        infile.get(ch);
        outfile.put(ch);
    }

    infile.close();
    outfile.close();
}

The above code reads data from edf.txt file and copy it into ew.txt file

edf.txt                             ew.txt


aliahmed                             aliahmed
ffff                                  ffffÿ

my question is that after copy extra character ÿ is append what is this character and how i remove it

Posted 13-Jun-13 1:09am

ALIWAZ

Updated 13-Jun-13 1:27am

nv3

v2

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2 solutions

Solution 2

The previous solution, although entirely correct, does not explain why that second test is necessary. Here is the full story:

After you have read the last character of the stream by

C++

infile.get (ch);

the stream is not yet in the end-of-file state. So the next loop iteration will still occur. Only after get attempts to read beyond the stream end the eof flag in the stream will be set. In that last iteration, in which get hits the end-of-file, ch will be set to the value EOF instead a valid character. And that EOF value (usually a -1) is what you see in your output.

In fact you could have written your loop with only one test like this:

C++

while (true)
{
    infile.get (ch);
    if (!infile.good())
        break;
    outfile.put (ch);
}

Posted 13-Jun-13 3:46am

nv3

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CPallini · Accepted Answer · 2013-06-13T01:36:00

Solution 1

You should also test the ifstream immediately after reading the character, namely

C++

//..
infile.get(ch);
if ( infile.good() ) outfile.put(ch);
// ..

See the sample code[^] at cplusplus.com.

Posted 13-Jun-13 1:36am

CPallini

Updated 13-Jun-13 1:38am

v2