Input line by line from an input file and tokenize using strtok() and the output into an output file

Question

What I am trying to do is to input a file LINE BY LINE and tokenize and output into an output file.What I have been able to do is input the first line in the file but my pro

Answer 1

You are using C runtime library when C++ makes this neater.

Code to do this in C++:

ifstream in;     //delcraing instream
ofstream out;    //declaring outstream

string oneline;

in.open("infile.txt");  //open instream
out.open("outfile.txt");  //opens outstream
while(getline(in, oneline))
{
    size_t begin(0); 
    size_t end;
    do
    {
        end = oneline.find_first_of(" ,", begin);

        //outputs file into copy file
        out << oneline.substr(begin, 
                    (end == string::npos ? oneline.size() : end) - begin) << ' ';

        begin = end+1;
        //pointer moves to second token after first scan is over 
    }
    while (end != string::npos);
}

in.close();      //closes in file
out.close();      //closes out file

Input:

a,b c

de fg,hijklmn

Output:

a b c de fg hijklmn

If you want newlines, add out << endl; at the appropriate point.