Programming Forums > Application Development > C++

yOURsELF · Mar 23rd, 2006, 4:58 AM

hi guys, how do i remove the last char from a stringstrem ?
for example: i have this stringstream "ABCD" and i want it to be "ABC"
p.s: i'm using VC++

Klarre · Mar 23rd, 2006, 5:12 AM

If you use the std::stringstream as an std::string instead, you can use this piece of code. It might be a very ugly way to do it. But it works!

(Toggle Plain Text)

#include <iostream>
#include <sstream>

std::string removeLast(std::string x)
{
	std::string y;

	for(std::string::iterator i = x.begin(); i != x.end()-1; ++i)
		y.push_back(*i);

	return y;
}

int main()
{
	std::string x = "ABC";

	std::cout << removeLast(x);

	std::cin.get();

	return 0;
}

This std::string you got returned can you then assign to your std::stringstream.

/Klarre

yOURsELF · Mar 23rd, 2006, 6:13 AM

thanks, but i really need to work only with stringstreams

any other way ?

nnxion · Mar 23rd, 2006, 6:25 AM

As far as I know, you can't. One treats stringstreams as if they were input/output streams.

Polyphemus_ · Mar 23rd, 2006, 7:02 AM

Quote:

Originally Posted by Klarre

If you use the std::stringstream as an std::string instead, you can use this piece of code. It might be a very ugly way to do it. But it works!

(Toggle Plain Text)

...

This std::string you got returned can you then assign to your std::stringstream.

/Klarre

Why don't you just use the substr function, it costs less code

.

DaWei · Mar 23rd, 2006, 7:18 AM

(Toggle Plain Text)

#include <iostream>
#include <strstream>
#include <string>
#include <string.h>

using namespace std;

int uhOh (string TroubleInRiverCity)
{
    cerr << TroubleInRiverCity << endl;
    return 1;
}
int main (int argc, char *argv [])
{
    strstream elStreamo;
    elStreamo << "ABCD" << '\0';
    cout << elStreamo.str () << endl;
    int len = strlen (elStreamo.str ());
    elStreamo.str ()[len-1] = '\0';
    cout << elStreamo.str () << endl;
    cin.get ();
    return 0;
}

Quote:

Originally Posted by Output

ABCD
ABC

nnxion · Mar 23rd, 2006, 7:30 AM

Mind you, that you are still using strings by using the str() function.
I don't know why in the world you said:

Quote:

Originally Posted by yOURsELF

thanks, but i really need to work only with stringstreams

any other way ?

Btw David, strstream is deprecated, use sstream instead. :p

DaWei · Mar 23rd, 2006, 8:45 AM

Ahhh, well, I'm old and the OP got an answer. Possibly he doesn't realize the contents of a string stream contain a char array or a C-string or a C++ string, depending upon how you go about it.

yOURsELF · Mar 23rd, 2006, 10:25 AM

i want to thank all of you for your help

now i have one more request (the last i hope). Can someone show me a function that returns this:
example: in (string) -> BDAADXXC out (string) -> BDAC
the function would look for 'X' and would erase the number of chars right before the 'X's.

appreciate for your attention

DaWei · Mar 23rd, 2006, 10:29 AM

I would suggest (as been earlier suggested) that you're designing your thangy the hard way. I would not lead you further down that path. Perhaps you'd like to elucidate on your goal so that you might get more effective help, instead of just workable help.

Mar 23rd, 2006, 4:58 AM	#1
yOURsELF Newbie Join Date: Mar 2006 Posts: 3 Rep Power: 0	Remove last char from a stringstream hi guys, how do i remove the last char from a stringstrem ? for example: i have this stringstream "ABCD" and i want it to be "ABC" p.s: i'm using VC++

Mar 23rd, 2006, 5:12 AM	#2
Klarre Game engine designer Join Date: May 2005 Location: Sweden Posts: 297 Rep Power: 4	If you use the std::stringstream as an std::string instead, you can use this piece of code. It might be a very ugly way to do it. But it works! (Toggle Plain Text) #include <iostream> #include <sstream> std::string removeLast(std::string x) { std::string y; for(std::string::iterator i = x.begin(); i != x.end()-1; ++i) y.push_back(i); return y; } int main() { std::string x = "ABC"; std::cout << removeLast(x); std::cin.get(); return 0; } #include <iostream> #include <sstream> std::string removeLast(std::string x) { std::string y; for(std::string::iterator i = x.begin(); i != x.end()-1; ++i) y.push_back(i); return y; } int main() { std::string x = "ABC"; std::cout << removeLast(x); std::cin.get(); return 0; } This std::string you got returned can you then assign to your std::stringstream. /Klarre

Mar 23rd, 2006, 6:25 AM	#4
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	As far as I know, you can't. One treats stringstreams as if they were input/output streams. __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

Mar 23rd, 2006, 8:45 AM	#8
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Ahhh, well, I'm old and the OP got an answer. Possibly he doesn't realize the contents of a string stream contain a char array or a C-string or a C++ string, depending upon how you go about it. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Mar 23rd, 2006, 10:29 AM	#10
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	I would suggest (as been earlier suggested) that you're designing your thangy the hard way. I would not lead you further down that path. Perhaps you'd like to elucidate on your goal so that you might get more effective help, instead of just workable help. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Mar 23rd, 2006, 6:13 AM	#3
yOURsELF Newbie Join Date: Mar 2006 Posts: 3 Rep Power: 0	thanks, but i really need to work only with stringstreams any other way ?

Mar 23rd, 2006, 10:25 AM	#9
yOURsELF Newbie Join Date: Mar 2006 Posts: 3 Rep Power: 0	i want to thank all of you for your help now i have one more request (the last i hope). Can someone show me a function that returns this: example: in (string) -> BDAADXXC out (string) -> BDAC the function would look for 'X' and would erase the number of chars right before the 'X's. appreciate for your attention

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Programming Forums > Application Development > C++

Remove last char from a stringstream