hello, some help with C++.
October 03, 2005 07:40 AM
hi all.
i am making a program that reads from a .txt file but i got 1 problom
the file is 20 lines
and i want to read only the 5th line
can anyone give me a code how to do it right?
thanks in advance
850
October 03, 2005 07:46 AM
There aren't really any efficient or clever ways of doing this (unless you use lines of a fixed length1).
Just begin by reading and discarding the first four lines.
Just begin by reading and discarding the first four lines.
October 03, 2005 07:47 AM
i aint so good at this at all :can you please post a full code how do i do that?
and dont i need to throw all lines after 5 too?
thanks in advance
and dont i need to throw all lines after 5 too?
thanks in advance
106
October 03, 2005 07:55 AM
However (if you are using windows)
you could arrange your file in such a manner to resemble an INI file. Do a search on your PC and you will find a few. Open one to see what it looks like.
Then you could use the Win32 API functions
GetPrivateProfileString to read string or GetPrivateProfileInt to read integers
I don't have time to prepare an example right now but you can do a search for these functions and it can come up with some examples.
Hope that helps
you could arrange your file in such a manner to resemble an INI file. Do a search on your PC and you will find a few. Open one to see what it looks like.
Then you could use the Win32 API functions
GetPrivateProfileString to read string or GetPrivateProfileInt to read integers
I don't have time to prepare an example right now but you can do a search for these functions and it can come up with some examples.
Hope that helps
1,020
October 03, 2005 07:57 AM
This should give you an idea (it lacks error-checking, though, so you will have to do that yourself):
[edit] This should be moved to For Beginners.
jfl.
#include <iostream>#include <fstream>#include <string>using namespace std;int main() { string input; ifstream fin( "in.txt" ); for( unsigned i = 0; i < 5; ++i ) getline( fin, input ); cout << input << endl; return 0;}[edit] This should be moved to For Beginners.
jfl.
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