//--------------------------------------------------------------------
//
//  Example showing problem with getline()               getprob.cpp
//
//--------------------------------------------------------------------

#include <iostream.h>   // For cin and cout
#include <fstream.h>    // For file input/output
#include <string.h>     // For strlen()

void main()
{
    ifstream inFile1("strline1.dat"),   // Input files
             inFile2("strline2.dat");
    char str[21],                       // Input string
         ch;                            // Input character
    
    // Read strings (one per line) from strline1.dat and output them.
    
    cout << "From strline1.dat: " << endl;
    while ( inFile1.getline(str,21,'\n') )
        cout << "String: " << str << endl;
    cout << endl;

    // Read strings (one per line) from strline2.dat and output them.

    cout << "From strline2.dat: " << endl;
    while ( inFile2.getline(str,21,'\n') )
        cout << "String: " << str << endl;
    cout << endl;

    // PROBLEM: The extra blank line occurred because the getline()
    // function stops reading when the character count reaches 20, 
    // leaving the (unread) newline marker in the input stream. The 
    // next call to getline() immediately reads this marker, stops, 
    // and returns an empty string.

    // FIX: Add code after call to getline() to read characters 
    // until the newline marker is read in.
       
    // Reset the file pointer to the start of the file.
    inFile2.seekg(0);   // Reset pointer
    inFile2.clear();    // Clear file flags (including eof)
    
    cout << "---- After fix ----" << endl;
    cout << "From strline2.dat: " << endl;
    while ( inFile2.getline(str,21,'\n') )
    {
        cout << "String: " << str << endl;
        if ( strlen(str) == 20 )     // Check if str full. If so, then
           do                        // newline marker not read in.
              inFile2.get(ch);       // Read until newline found.
           while ( ch != '\n' );
    }                                     
    cout << endl;
}