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i am having trouble with file processing.
for example if a file is like
123 kevin lin
423 joe black
983 peter parker
877 john smith
i want to remove the third line( peter parker one) and shift rest of contents up. so that file would go like
123 kevin lin
423 jow black
877 john smith
please help me in this regard.
what class is this for?
One way to do it: Read in the file a line at a time, saving each line in some sort of data structure. Then close the file and open it for writing and write out each line from the data structure. Either during the reading or the writing, identify the line you want to skip, and skip it.
the quick,easy,dirty way to do it is this:
1-open the source file
2-open (create) a destination file
<loop>
3-read a line from the source file
4-if it's not the line you want to skip, write it to the destination file
</loop>
5-close the files
6-system("copy [destination file] [source file]");
7-system("del [destination file]");
like I said, quick, easy, dirty... especially dirty... but for an assignment like this it doesn't seem like it should matter very much unless your teacher specifically told you not to use system commands or they're a real teacher.
but then again the teachers that give assignments like these don't usually know very much about the language themselves, or they're willing to dumb it down enough for newcommers.
also, that's assuming you're working in a windows environment. if you're using something else, look up the copy and delete command-line instructions and use them in place of copy and del in steps 6 and 7
If I were you, I'd look up different ways of doing this, because this is generally not a good way to go about doing it for security reasons, among other things... "security" seems to be a big buzzword around the software industry... I write a small program for somebody to calculate weight on the moon, and they ask me if it's "secure" enough and ask questions about it's "vulnerability to attack from hackers, spyware, and viruses" wtf...
i am using windows and visual c++ compiler. isnt there any easy way to do so. how can i rename the modified destination file to source file and delete the source file.
I just told you the easy way... other ways are shifting bits in the file stream, and going more specifically into windows programming, which both seem a little advanced for where you are now...
You mean one of those 3-liners? Input weight, divide by 6 and spit out the answer?... Is this person a developer him/herself? :oQuote:
I write a small program for somebody to calculate weight on the moon, and they ask me if it's "secure" enough and ask questions about it's "vulnerability to attack from hackers, spyware, and viruses" wtf...
>> isnt there any easy way to do so.
If there was an easier way, it would have been mentioned.
>>how can i rename the modified destination file to source file and delete the source file.
Read major_small's post, idijut.
exactly what I mean... and no, thankfully they weren't a developer... if they were I would have to tear into them for that...Quote:
Originally Posted by Hunter2
edit: actually, there was a semi-infinite loop involved... one of those "enter 0 to end the program" types of deals...
i,m working in windows, but his system command isnt working
system("copy [destination file] [source file]");
system("del [destination file]");
can u plz let me know the exact code to copy and delete files.
>how can i rename the modified destination file to source file and delete the source file.
One way:
Or:Code:remove("source_file.txt");
rename("modified_file.txt","source_file.txt");
Code:system("delete source_file.txt");
system("copy modified_file.txt source_file.txt");
Gee, I wonder why :rolleyes: Look, copy and paste will rarely if ever work. Figure out what the person's saying, learn it, understand it, and then write it. You asked how to copy and delete files; he told you HOW to copy and delete. Since you neglected to tell him the filenames of the files you're trying to copy and delete, he put [destination file] and [source file] as placeholders. By the thunderbolts of Zeus, he gave you AS CLOSE TO THE FRIGGIN EXACT CODE AS POSSIBLE!Quote:
i,m working in windows, but his system command isnt working
system("copy [destination file] [source file]");
system("del [destination file]");
can u plz let me know the exact code to copy and delete files.
Quote:
Originally Posted by Thantos
haha... you just made me laugh in the middle of a javascript class... that's now just as classic as Thantos' quote :DQuote:
Originally Posted by Hunter2