Excuse me, Sina, but you don't need to insult my intelligence by telling me to lookup how the function works. I never claimed it didn't work like you stated. And you continually use that against me, saying that I don't? Again, you stick with the straw man, but hey, we all do what we do best.
I said that using exit() destroys the structure of a C program.
float divide(float x, float y) {
if (y == 0. /* optional epsilon comparison */) exit(EXIT_OOPS);
return x / y;
}
That is what I mean by exit() destroying structure. When you start
teaching beginner programs that exit() is a good way to leave a program
in case of an error, well, take a guess what they do.. I'm not a fan of
exit() in any case whatsoever. I'm a fan of cleaning up my own mess.
On 4/13/2011 8:16 PM, Sina Bahram wrote:
What are you talking about! Exit is part of an API to do exactly that. You can register functions, or callbacks, that even get called before it exits the program. Furthermore, it cleanly ends streams so that data isn't lost, and it also handles temporary file handles. I'm sorry, but do you teach posix compliance at all, or anything? Because, I'm so confused as to how you don't know this about exit. Are you familiar with the atexit function, and how it is used to register callback events? As for C++. If you have properly coded cascading destructors fed by a simple broadcast message or other form of notification, then what's the problem with calling exit after that runs? Of course you would clean up your external resources before calling exit, but you can use the exit interface to do even this. In fact, that's encouraged. So, yes, i am saying they could easily use exit and not leave one byte of memory unfreed, and do so cleanly. Take care, Sina -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Christopher Coale Sent: Wednesday, April 13, 2011 11:00 PM To: programmingblind@xxxxxxxxxxxxx Subject: Re: again a newbee question First of all, what you explained to me that it does has nothing to do with control structure. C and C++ are structured languages, so when people unnecessarily use things that break the structure (such as goto), I am not too fond of it. So let me get this straight.. you are advocating that a programmer simply call exit() instead of using the proper API to release resources they allocated, prior to quitting the program? On 4/13/2011 7:41 PM, Sina Bahram wrote:I don't understand what that means. Totally destroys what structure? It's an exit ... of course it destroys everything. Furthermore, exit is an extremely clean way of exiting a program. It's a million times better than return 0. It actually calls, in reverse order of course, all functions which registered via atexit. It also closes streams, not only IO ones for that matter, and it gets rid of/cleans temporary files. Quite puzzled ... Take care, Sina -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Christopher Coale Sent: Wednesday, April 13, 2011 9:38 PM To: programmingblind@xxxxxxxxxxxxx Subject: Re: again a newbee question Alright, I just wanted to force you to clarify, so you don't give Ashish the wrongi dea. ;) I grade C++ programming assignments, and I see new C++ programmers using the exit function simply because it's convenient, but it totally destroys the structure. On 4/13/2011 6:35 PM, Ken Perry wrote:Well I was using exit as a concept more than a method since depending on the gui you code in there are things like finish, exit, delete and all kinds of way to make a program die. Ken -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Christopher Coale Sent: Wednesday, April 13, 2011 9:28 PM To: programmingblind@xxxxxxxxxxxxx Subject: Re: again a newbee question Careful with saying "until you call exit." You don't want to give the impression that the exit() function is okay in a structured program, do we? ;) On 4/13/2011 6:25 PM, Ken Perry wrote:Nod you will not need things like scanf and getch and things of the like when you get into serious coding because you will be probably building windows apps of some kind and the window will remain open till you call exit. This is just while you're learning so feel free to use scanf,getch,getchar, or any of the things like read to just hold the program till your ready to close. Ken -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of ashish rohtagi Sent: Wednesday, April 13, 2011 9:05 PM To: programmingblind@xxxxxxxxxxxxx Subject: Re: again a newbee question sorry, I corrected the mistake about printf and scanf. thanks for the advice. take care, regards. ashish On 4/14/11, Littlefield, Tyler<tyler@xxxxxxxxxxxxx> wrote:I'm sorry, getch should be getchar. Also: it's fairly bad coding style to put a printf on the same line as a scanf. Unless you have good reason, try to keep your code separated. It makes it easier to read and people don't miss things quite as easily. On 4/13/2011 6:50 PM, ashish rohtagi wrote:like this?? #include<stdio.h> int main() { char me[20]; printf("What is your name?"); scanf("%s",&me); printf("Darn glad to meet you, %s!\n",me); scanf("s%",&me); return(0); } but result is still the same. can I use getch fungtion? if yes please tell me how to use it . take care, regards. On 4/14/11, Jared Wright<wright.jaredm@xxxxxxxxx> wrote:It goes right between the last printf statement and the return statement. It's job is to hold the program open at the end, so itshouldbe the last statement before return, which ends the program. On 4/13/2011 12:09 PM, ashish rohtagi wrote:hi Tyler, thanks for your suggestion, but I am unable to understand where to put second scanf. will you just once show me? take care, regards. ashish On 4/13/11, Littlefield, Tyler<tyler@xxxxxxxxxxxxx> wrote:Like ken said, use scanf to catch it before the window closes, or run it in a command line. Here's what's happening: You open the process, and the first scanf call blocks; that is tosay,it will not process anything, it is simply waiting for the user to input something. But after it's done printing, there is no reason why it should stay open because you don't tell it to. So run from thecommandprompt, use getch() to let you hit enter before it closes or use another scanf. On 4/13/2011 9:32 AM, ashish rohtagi wrote:friends, thanks for all the encouragement. here is my problem, Iwantto use scanf fungtion. in input and output but as soon as I give my input and press enter the window disappears. it does not give output based on my input. here is the code. #include<stdio.h> int main() { char me[20]; printf("What is your name?"); scanf("%s",&me); printf("Glad to meet you, %s!\n",me); return(0); } On 4/13/11, Littlefield, Tyler<tyler@xxxxxxxxxxxxx> wrote:O. oops. In my defense, I haven't found coffee. :) On 4/13/2011 7:46 AM, Jared Wright wrote:It's there, just on the same line as the printf statement. On 4/13/2011 9:35 AM, Littlefield, Tyler wrote:good job on using int main, just don't forget a return 0; whenyouare done. between the printf and the closing brace. On 4/13/2011 6:36 AM, ashish rohtagi wrote:here is my code it compiles correctly but text just shows on the screen for 1 second, I want it to stay. #include<stdio.h> int main() { printf("I will learn programming!\n"); return(0); } On 4/13/11, DaShiell, Jude T. CIV NAVAIR 1490, 1, 26 <jude.dashiell@xxxxxxxx> wrote:You didn't put your printf statement in your message, but letmemake a guess. You didn't put a (\n) in before the closing quote marksoyou just put text on the screen without a line ending. That couldbeone contributing factor. Another might be you didn't put an#include<stdio.h> statement in at the top of your program and maybe used #include<conio.h>. If that's the case, don't use printf with conio.h unless you also include stdio.h. For conio.h, cprintf is the function you want. Hope this helps. -----Original Message----- From: programmingblind-bounce@xxxxxxxxxxxxx [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of ashish rohtagi Sent: Wednesday, April 13, 2011 8:04 To: programmingblind@xxxxxxxxxxxxx Cc: punitdiwan@xxxxxxxxx Subject: again a newbee question friends, sorry here I am with another foolish question, sorrybuthere is no one to teach and I am learning myself. when I print any text on screen using printf it quickly disappears. what should I dothatit should stay? take care, regards. ashish __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind-- Thanks, Ty __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind-- Thanks, Ty __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind-- Thanks, Ty __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind__________ View the list's information and change your settings at //www.freelists.org/list/programmingblind __________ View the list's information and change your settings at //www.freelists.org/list/programmingblind
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