Searching from an input file, writing to another.

[lnwlfx44]

I'm trying to make a program to "copy and paste" the rest of the lines starting with " Frequencies --" from a data file to a new file. I have the .exe in the folder with the .OUT files (my inputs.) The .DAT files I create remain at 0KB and the program runs forever.



#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <string.h>
#include <fstream>

using namespace std;

int main(int argc, char *argv[])
{
ifstream infile;
ofstream outfile;

char filename[64];
char string[256];
long linenumber=1;

cout << "Enter filename" << '\n';
cin >> filename;
cin.ignore(150, '\n');

infile.open( strcat(filename, ".OUT"), ios::in);
outfile.open( strcat(filename, ".DAT"), ios::out);

infile.unsetf(ios::skipws);

do
{
cout << linenumber << '\n';
infile.get(string, 15);
if (strcmp(" Frequencies --", string)==0)
{
infile.getline(string, 256);
outfile << string << endl;
linenumber++;
}
else
{
infile.getline(string, 256);
linenumber++;
}
} while (!infile.eof());

outfile.close();

cout << "Success";


system("PAUSE");
return EXIT_SUCCESS;
}

[jammas615]

hey, ok,
you have while (!infile.eof()); after a curly bracket. should'nt be where the do is instead of it. and also i think the strcat(filename, ".OUT") and strcat(filename, ".DAT") make it read the filename as .OUT'filename' , anyway look it up. consider making a different file, and cut this code down to work with the basics. like using .txt's. in other words do the fancy things when you can build off basic stuff.

[lnwlfx44]

The "while" condition is proper (consulted my previous text from years ago) and the output file is named the way I want. The output of this program is filename.OUT.DAT.

[lnwlfx44]

I believe the error may lie in the do-while loop, but I'm not sure. When I run the program, It outputs infinitely more line-numbers than there are lines to the console, but nothing to the file. The output file IS created, though.