Go4Expert - Problem with files

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- - Problem with files - Urgent (http://www.go4expert.com/showthread.php?t=8738)

Problem with files - Urgent

hello i am new to this forum.. so i need your help to solve my c++ program to run..
i am using files:-
in fact i am reading data from a file name p.txt 16 bytes @ a time and then saving the data in the file c.txt till eof p.txt..
so i have to read the 1st 16 bytes from p.txt and save it in c.txt and then the next 16 bytes are read and then rewritten in c.txt till eof..
i have written the codes but i am having this problem:-

p.txt: aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbb
c.txt: aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ

so why ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ is copied to the file c.txt it shoule be same as that in the p.txt file
please help me how to solve this problem

the code is:-

Code:

#include<iostream.h>

#include<fstream.h>

void main()

{

int i,j;

char d;

char a[4][4];

ifstream myfile1 ("p.txt");

ofstream myfile3 ("c.txt");

                 

if (myfile1.is_open())

{

        while(!myfile1.eof())

        {        

                for ( j=0; j<4; j++)

                for ( i=0; i < 4; i++)

                {        

                        myfile1.get(d);

                        a[i][j] = d; // plaintext                                

                        cout<<a[i][j];

                 }        



                if (myfile3.is_open())

                {

                        for(j=0; j< 4; j ++)

                        for ( i=0; i<4; i++)

                          myfile3<<a[i][j];        

                        //cout<<a[i][j];

                }

                else 

                         cout << "Unable to open file";        

        }                                        

        

        myfile3.close();

}         

else 

cout << "Unable to open file";

        myfile1.close();

}

Re: Problem with files - Urgent

try this one...just look at it carefully and i believe u will identify the mistake u were making...

Code:

void main() {

    int i,j;

    char d;

    char a[4][4] = {0};

    ifstream myfile1 ("p.txt");

    ofstream myfile3 ("c.txt");

    if (myfile1.is_open()) {

        while(!myfile1.eof()) { 

            for (j = 0; j < 4; j++)

                for (i = 0; i < 4; i++) {   

                    myfile1.get(d);

                    a[i][j] = d; // plaintext               

                    d = 0;

                    cout<<a[i][j];

                }   

            if (myfile3.is_open()) {

                for(j = 0; j < 4; j ++)

                    for ( i = 0; i < 4; i++) {

                        if (a[i][j])

                        myfile3<<a[i][j];   

                    }

            } else 

                cout << "Unable to open file";  

        }

        myfile3.close();

    } else 

        cout << "Unable to open file";

    myfile1.close();

}