Thread: question about reading files in

Hi,

I am having a lot of trouble with reading a file in, but being able to ignore the first few lines. This is the file I'm reading in:

######################
#something
#####################


somethingtobereadin1

somethingtobereadin2


I want to be able to ignore the first 3 lines and whitespace, and read in the strings "somethingtobereadin1" and "somethingtobereadin2". I am posting the code I have written so far, I tried reading it in and then using the ignore function. However, I am having lots of trouble trying to figure this out and will appreciate any help anyone can provide. THanks for any help.

Here is the code:

Code:

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

int main()
{
  ifstream infile;
  infile.open("readinfile");

  char buffer[50];
  string temp; 
 
while (!infile.eof()){

  infile>>buffer;
  infile.ignore(100,'\n');
 
  infile>>temp;
 
   cout<<temp<<endl;
}

}

Hi, thanks for the response.

However, the code posted did not work and I am still having trouble figuring this out. I want to be able to ignore the first 3 line of comments.

And then want to be able to read in the rest of the strings, one line at a time till the end of file.

What I was trying to do in the code posted in the previous posted code is to readin the buffer of a certain size and then ignore it and then start reading the strings till the end of file.

I am not sure if this is possible, but would appreciate any additional help on this. Here is the read in file and the reading in code below it.

######################
#something
######################

somethingtobereadin1

somethingtobereadin2

The code:

Code:

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

int main()
{
  ifstream infile;
  infile.open("readinfile");

  char buffer[50];
  string temp; 
 
while (!infile.eof()){

  infile>>buffer;
  infile.ignore(100,'\n');
 
  infile>>temp;
 
   cout<<temp<<endl;
}

}

Thanks so much for any help anyone can give !

Ignoring or reading--it's the same difference.

Code:

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

using namespace std;

int main()
{
	ifstream infile("readinfile");

	string temp;

	for(int i=0; i<3; i++)
	{
		getline(infile, temp); 
	}
	
	int count = 0;
	
	while(!infile.eof())
	{ 
		getline(infile, temp);
		count++;
		
		if(count%2 == 0) //if count is even
		{
			cout<<temp<<endl;
		}
	}

	return 0;
}

Hi,

Thanks for the response.

I am still having trouble with a piece of code: I have been trying to read in a file, ignore the first 3 lines and then read in the 2 strings that follow. I can open the FILE but can't figure out how to be able to ignore the first 3 lines and then read in the 2 strings that follow.

Here is the readinfile:

###################### //ignore this
#something //ignore this
###################### //ignore this

somethingtobereadin1 //read this string in

somethingtobereadin2 //read this string in

Here is the code:

Code:

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

int main()
{
  ifstream infile;
  infile.open("readinfile");

  char buffer[50];
  string temp; 
 
while (!infile.eof()){

  infile>>buffer;
  infile.ignore(100,'\n');
 
  infile>>temp;
 
   cout<<temp<<endl;
}

}

I tried the code someone suggested, however I get no output when I ran it.

I have been stuck on this and would appreciate any help or guidance on how to do this.

THanks in advance for any help anyone can provide.

I tried the using namespace std;

You said your code gave you no ouput, but your code won't even compile without the using namespace line. Did your code not compile or did you get no ouput? Or, do you consider those the same?

The code did compile without the using namespace std, and when I ran the a.out, there was no output.

And then I ran the code posted (which had the using namespace), and that compiled as well, and I ran the a.out, and there was no output.

I am doing this on solaris, and I double checked the name of the file being read in, unfortuantly , still getting no output.
when you ran this code, did it output the 2 strings successfully??

THanks for all your time and help!

Of course! Otherwise, I wouldn't have posted it. But it's dependent on the exact format of the input file you posted. If your format actually has an extra blank line at the beginning of the data to be read in, then instead of discarding the blank lines, the program will discard the data to be read in and display the blank lines. However, you should have enough information to alter it to fit your input file.

Thanks for your help!!! There was something wrong with my compiler....but it works now...thanks again for the help!