Need help with input streams from multiple source files

orikon · 10-07-2005, 07:38 PM

I have a master file listing 15 subfiles in the same directory. Each of these files has a name in the top line, and 2 digit numbers in each subsequent line (about 5 lines). What I need to do is open each of those file names by calling it from the master file, and print the name (first line) to the screen in descending order, and calculate the average of the numbers.

What I'm having trouble with is i get what looks like an infinite loop. I'm able to output the name and average of each file just fine, but after that, nothing happens, it seems to be trying to get input that isnt there. Im using Gnu on a unix system

Any help would be appreciated, thanks!

Code:

        infile1.open("master_file")
	while(!infile1.eof())
		{
		infile1.getline(string, 80, '\n');
		cout<<string<<endl;


		infile2.open(string); 
		for(line=0;line<1;line++)
			{
			infile2.getline(name, 80, '\n');	//get name
			cout<<name<<endl;

			infile2>>score;
/*-----------------while(!infile2.eof())			//get score
				{
				total+=score;
				num++;
				infile2>>score;
				} ------------------------Gets stuck in this loop*/
			cout<<total/num<<endl;
			}
		infile2.close();
		infile2.clear();
                total=num=0;	
		}
     infile1.close();
     infile2.clear();

Daved · 10-08-2005, 11:42 AM

I'm not sure if this is your problem, but if the infile2 file stream goes into a fail state, that loop will go forever because you are only checking for eof(). A better way to do that loop is to put the read into the control of the while loop. Instead of this:

Code:

infile2>>score;
while(!infile2.eof())			//get score
{
	total+=score;
	num++;
	infile2>>score;
}

Use this:

Code:

while(infile2>>score)			//get score
{
	total+=score;
	num++;
}

orikon · 10-08-2005, 02:56 PM

Thank you so much, it's working now

You saved me a lot of time, really appreciate it

10-07-2005, 07:38 PM	#1
orikon Registered User Join Date: Oct 2005 Posts: 19	Need help with input streams from multiple source files I have a master file listing 15 subfiles in the same directory. Each of these files has a name in the top line, and 2 digit numbers in each subsequent line (about 5 lines). What I need to do is open each of those file names by calling it from the master file, and print the name (first line) to the screen in descending order, and calculate the average of the numbers. What I'm having trouble with is i get what looks like an infinite loop. I'm able to output the name and average of each file just fine, but after that, nothing happens, it seems to be trying to get input that isnt there. Im using Gnu on a unix system Any help would be appreciated, thanks! Code: infile1.open("master_file") while(!infile1.eof()) { infile1.getline(string, 80, '\n'); cout<<string<<endl; infile2.open(string); for(line=0;line<1;line++) { infile2.getline(name, 80, '\n'); //get name cout<<name<<endl; infile2>>score; /-----------------while(!infile2.eof()) //get score { total+=score; num++; infile2>>score; } ------------------------Gets stuck in this loop/ cout<<total/num<<endl; } infile2.close(); infile2.clear(); total=num=0; } infile1.close(); infile2.clear();
orikon is offline

10-08-2005, 11:42 AM	#2
Daved Registered User Join Date: Jan 2005 Posts: 7,252	I'm not sure if this is your problem, but if the infile2 file stream goes into a fail state, that loop will go forever because you are only checking for eof(). A better way to do that loop is to put the read into the control of the while loop. Instead of this: Code: infile2>>score; while(!infile2.eof()) //get score { total+=score; num++; infile2>>score; } Use this: Code: while(infile2>>score) //get score { total+=score; num++; }
Daved is offline

10-08-2005, 02:56 PM	#3
orikon Registered User Join Date: Oct 2005 Posts: 19	Thank you so much, it's working now You saved me a lot of time, really appreciate it
orikon is offline

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