Thread: parsing in c++

  1. #1
    Registered User
    Join Date
    May 2007

    parsing in c++

    // reading a text file
    #include <iostream>
    #include <fstream>
    #include <string>
    using namespace std;
    int main () {
      string line;
      ifstream myfile ("example1.txt");
      ofstream myargument ("putonqueue.txt",ios::out | ios::app);
      if (myfile.is_open())
        while (! myfile.eof() )
    	 // expects either space-delimited numbers 
        while( getline(myfile,line) ) {
            istringstream ss (line);
            double d;
            while( ss >> d ) {
              cout << "  got a number: " << d << endl;
      else cout << "Unable to open file"; 
      return 0;
    Hi I am trying to parse a text file in c++.The above code gives a compiler error:
    argque.cpp: In function `int main()':
    argque.cpp:20: error: variable `std::istringstream ss' has initializer but incomplete type

    what does it mean?
    any help or insight is appreciated.

  2. #2
    C++ Witch laserlight's Avatar
    Join Date
    Oct 2003
    You forgot to #include <sstream>.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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