Line numbering program

Factual Questions
1

I’m working on a project which requires a large list of words, each to be numbered (No, this doesn’t have to do with hacking, I’m making a random poetry engine). I was just wondering if there was any program that would take a text file and add a number to each line just so I don’t have to do it all by hand, or if not, could someone help me figure out how to make one in C/C++.

2

Word does it. So does NoteTab.

3

Well, I’m the hacker who’s going to help you.

In C++, 'cause C isn’t as nice for this kind of work:



#include <fstream>
#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main(int argc, char *argv[])
{
   vector<string> v;
   string s;
   ifstream file;

   if (argc < 2) {
      cout << "usage: linenum file" << endl;
      return 1;
   }

   if (!file.open(argv[1])) {
      cout << "Can't open file " << argv[1] << endl;
      return 1;
   }

   while (s << file)
      v.push_back(s);

   for (int i = 0; i < v.size(); ++i)
      cout << i + 1 << " : " << v*;

   file.close();

    return 0;
}
4

You can download Note Tab for free here.

5

Jeez. There’s no reason to use C++ for such a simple job:



perl -pi -e 'print "$.: "' < input.txt > numbered.txt

Easy as pie.

6

Ewww, perl. :wink:



awk '{ print NR " " $0 }' < source_file > destination_file
7

Not everyone is lucky enough to have a Perl or awk interpreter. I assumed the OP just had a C++ compiler (probably one of the MS variants) and was running a Win32 system with none of the stuff that makes a *nix command line so nice.

If it had been my system (Fedora Core 1, at the moment), I’d have used awk out of force of habit. :wink:

8

Oh, and my code is broken.

Replace the ‘while (s << file)’ with ‘while (getline(file, s))’ and the ‘cout << i + 1 << " : " << v*;’ with ‘cout << i + 1 << " : " << v* << endl;’ and it should all work fine.

That’s what you get for using C++ to do Perl’s job. :smiley:

9

How about a grep:


grep "" -n input.txt > output.txt
10

C++, perl, and awk all seem like overkill when plain old cat’s -n flag will do the trick.



cat -n < input.txt > output.txt
11

I think John T. Conklin wins the prize. Although to be even more pedantic, don’t actually need the input redirection.

12

Yep, John wins. I had forgotten about that option to cat.