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File I/O input being misread?
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I am having a major problem with a really simple File I/O operation. I have a pretty simple datafile filled with a list of names and courses.
I am trying to read the name and the course into a large MultiLinkedList. However, for some reason the data is getting corrupted between the file reading and then the input into the program. This is what the file reading operation is producing for output when I decided to do a dump of the input into a output during debugging.
Obviously this is entirely throwing the data structure completely out whack as it has no way for handling borked input like that. Here is the entire file read operation, it is really simple...
The code for strlow() does not appear to be the problem. But if anyone wants to see it, here it goes:
Any assistance would be appreciated, as this is the last serious bug holding up my project. I know everything else works because I can manually enter all the data from the program. But that's rather useless.
text Syntax (Toggle Plain Text)
I am trying to read the name and the course into a large MultiLinkedList. However, for some reason the data is getting corrupted between the file reading and then the input into the program. This is what the file reading operation is producing for output when I decided to do a dump of the input into a output during debugging.
text Syntax (Toggle Plain Text)
Obviously this is entirely throwing the data structure completely out whack as it has no way for handling borked input like that. Here is the entire file read operation, it is really simple...
C++ Syntax (Toggle Plain Text)
The code for strlow() does not appear to be the problem. But if anyone wants to see it, here it goes:
C++ Syntax (Toggle Plain Text)
Any assistance would be appreciated, as this is the last serious bug holding up my project. I know everything else works because I can manually enter all the data from the program. But that's rather useless.
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Join Date: Jul 2005
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output name and course before sending them to strlow to be sure they have been read in correctly. If not, can you read the file called students when you open it in a text editor? If not how is the file called students created?
Last edited by Lerner; Nov 11th, 2008 at 9:22 pm.
Klatu Barada Nikto
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Originally Posted by Lerner 
output name and course before sending them to strlow to be sure they have been read in correctly. If not, can you read the file called students when you open it in a text editor? If not how is the file called students created?
I don't know what was wrong with the file. But I decided to go and delete the file and replace it with another filled with the same data and the program is working perfectly.
Wierd.
Wierd.
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Join Date: Jul 2005
Posts: 1,761
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Solved Threads: 283
That's wierd. There should be no spaces in a string read in with the >> operotor as any whitespace terminates the input into the variable.
I doubt it is the problem, but this:
while (!fin.eof())
is a bug waiting to bite you. Don't use the return value of eof() to control a loop. Change it to this:
If necessary I'd create another file called practic.txt using a text editor and entering the following data directly into the practice.txt using the keyboard:
first course
second class
Then I'd save practice.txt to the same folder the program is in.
Then I'd run the program associating practice.txt with fin instead of students.txt and outputting the variables name and course as they are read in to see what happens. If they are read in correctly then it's likely students.txt is the problem.
Edit:: Good for you. See my other suggestion above.
I doubt it is the problem, but this:
while (!fin.eof())
is a bug waiting to bite you. Don't use the return value of eof() to control a loop. Change it to this:
C++ Syntax (Toggle Plain Text)
If necessary I'd create another file called practic.txt using a text editor and entering the following data directly into the practice.txt using the keyboard:
first course
second class
Then I'd save practice.txt to the same folder the program is in.
Then I'd run the program associating practice.txt with fin instead of students.txt and outputting the variables name and course as they are read in to see what happens. If they are read in correctly then it's likely students.txt is the problem.
Edit:: Good for you. See my other suggestion above.
Last edited by Lerner; Nov 11th, 2008 at 9:51 pm.
Klatu Barada Nikto
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