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C++ I/O Files

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Join Date: Oct 2008

Posts: 9

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koman

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C++ I/O Files

Nov 17th, 2008

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
int main()
{
   string name;
   cout << "Please enter the filename of the encoded message:";
   getline(cin,name);
 
   ifstream infile;
   infile.open(name.c_str());
 
   if (infile.fail()) {
      cout << name << " fail to open." << endl;
      exit(1);
   }
 
cout << name << endl;
   cout << " File successfully opened" << endl;
 
   string buffer;
   getline(infile, buffer);
 
   while ( !infile.eof() ) {
   cout << buffer << endl;
   }
 
   return 0;
}
int main()
{
   string name;
   cout << "Please enter the filename of the encoded message:";
   getline(cin,name);

   ifstream infile;
   infile.open(name.c_str());

   if (infile.fail()) {
      cout << name << " fail to open." << endl;
      exit(1);
   }

cout << name << endl;
   cout << " File successfully opened" << endl;

   string buffer;
   getline(infile, buffer);

   while ( !infile.eof() ) {
   cout << buffer << endl;
   }

   return 0;
}

Hi I'm making a program where the user types in the name of a file and displays the context of the file in the console window. I'm trying to use getline function to read from the stream. The problem is that it reads the file and displays ONLY the first line ( it displays the first line, but it' an infinite loop) of the file to the console screen. How do I get it to display all the lines of the file to the terminal? I know I could use some type of loop, but I don't know what to do for the loop. So how do I display the other lines?

Last edited by Narue; Nov 17th, 2008 at 10:01 pm. Reason: added code tags

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Narue

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Re: C++ I/O Files

Nov 17th, 2008

This is how you read a file using getline:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
while ( getline ( infile, buffer ) ) {
  // Process the line
}
while ( getline ( infile, buffer ) ) {
  // Process the line
}

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Join Date: Oct 2008

Posts: 9

Reputation: koman is an unknown quantity at this point

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koman

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Re: C++ I/O Files

Nov 17th, 2008

•

Originally Posted by Narue

This is how you read a file using getline:
Help with Code Tags

C++ Syntax (Toggle Plain Text)
while ( getline ( infile, buffer ) ) {
  // Process the line
}
while ( getline ( infile, buffer ) ) { // Process the line }

I don't understand that can u post it in my code?

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VernonDozier VernonDozier is offline

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Re: C++ I/O Files

Nov 18th, 2008

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Originally Posted by koman

I don't understand that can u post it in my code?

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
   getline(infile, buffer);
 
   while ( !infile.eof() ) {
   cout << buffer << endl;
   }
   getline(infile, buffer);

   while ( !infile.eof() ) {
   cout << buffer << endl;
   }

This is an infinite loop. Put the getline statement inside the while loop. If you put it where Narue says to put it, you can get rid of the eof part.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
   while ( getline(infile, buffer) ) {
   cout << buffer << endl;
   }
   while ( getline(infile, buffer) ) {
   cout << buffer << endl;
   }