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C++ pause command

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C++ pause command

theholygod	5 Jul, 2007 - 03:25 AM Post #1
D.I.C Head Joined: 5 Feb, 2006 Posts: 223 My Contributions	So im trying to get back into C++. again. I typed up the hello world tutorial, and remembered that as soon as i hit "compile and run", the command line window would pop up for a split second and then close again (seeing as it has finished what it has done) i remembered that i used to use a pause command of some kind. i tried CODE system(PAUSE); but this didnt work. My computing teacher suggested i put in an endless loop (which sounds pretty stupid and inneficient). Does anyone know the pause command im looking for? i remember it said "please press enter to continue"
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Xing	RE: C++ Pause Command 5 Jul, 2007 - 03:35 AM Post #2
D.I.C Addict Joined: 22 Jul, 2006 Posts: 723 Thanked: 4 times Dream Kudos: 1575 My Contributions	Please look at this http://www.dreamincode.net/code/snippet582.htm
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no2pencil	RE: C++ Pause Command 5 Jul, 2007 - 04:02 AM Post #3
My fridge be runnin OH NOEZ! Joined: 10 May, 2007 Posts: 7,123 Thanked: 76 times Dream Kudos: 2425 Expert In: Goofing Off My Contributions	Rather than use the system(PAUSE) like you did, I would issue the sleep directly within the code. http://www.dreamincode.net/forums/showtopic16391.htm
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mattman059	RE: C++ Pause Command 5 Jul, 2007 - 04:21 AM Post #4
D.I.C Regular Joined: 23 Oct, 2006 Posts: 361 Dream Kudos: 175 My Contributions	....just put " " around pause..like this CODE system("pause");
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Xing	RE: C++ Pause Command 5 Jul, 2007 - 05:12 AM Post #5
D.I.C Addict Joined: 22 Jul, 2006 Posts: 723 Thanked: 4 times Dream Kudos: 1575 My Contributions	theholygod do not follow what above two are saying. They are bad alternatives.
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no2pencil	RE: C++ Pause Command 5 Jul, 2007 - 05:14 AM Post #6
My fridge be runnin OH NOEZ! Joined: 10 May, 2007 Posts: 7,123 Thanked: 76 times Dream Kudos: 2425 Expert In: Goofing Off My Contributions	QUOTE(Xing @ 5 Jul, 2007 - 06:12 AM) theholygod do not follow what above two are saying. They are bad alternatives. Could you elaborate so I can understand why they are bad alternatives?
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Xing	RE: C++ Pause Command 5 Jul, 2007 - 06:00 AM Post #7
D.I.C Addict Joined: 22 Jul, 2006 Posts: 723 Thanked: 4 times Dream Kudos: 1575 My Contributions	Few reasons 1. There is a difference between sleep and pause. 2. sleep is non-portable like the parameters of system function. 3. You must include a headers you probably don't need: stdlib.h or cstdlib, someother for sleep. 4. system is very expensive and resource heavy function call. It's like using a bulldozer to open your front door. It works, but the key is cleaner, easier, cheaper. What system() does is: #suspend your program #call the operating system #open an operating system shell (relaunches the O/S in a sub-process) #the O/S must now find the PAUSE command #allocate the memory to execute the command #execute the command and wait for a keystroke #deallocate the memory #exit the OS #resume your program What I have showed you is much cleaner and portable way. This post has been edited by Xing: 5 Jul, 2007 - 06:01 AM
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no2pencil	RE: C++ Pause Command 5 Jul, 2007 - 06:13 AM Post #8
My fridge be runnin OH NOEZ! Joined: 10 May, 2007 Posts: 7,123 Thanked: 76 times Dream Kudos: 2425 Expert In: Goofing Off My Contributions	QUOTE(Xing @ 5 Jul, 2007 - 07:00 AM) 2. sleep is non-portable like the parameters of system function. This makes them equal, therefor not a reason to use one over the other. QUOTE(Xing @ 5 Jul, 2007 - 07:00 AM) 4. system is very expensive and resource heavy function call. It's like using a bulldozer This is exactly why I would use sleep over system("pause"); So again, why is sleep a bad alternative to system("pause"), other than including a header file? Which is lesser evil, including an extra header or using a system call?
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Xing	RE: C++ Pause Command 5 Jul, 2007 - 06:41 AM Post #9
D.I.C Addict Joined: 22 Jul, 2006 Posts: 723 Thanked: 4 times Dream Kudos: 1575 My Contributions	I never compared sleep with system. I said sleep and system are bad alternatives as compared to my solution. This post has been edited by Xing: 5 Jul, 2007 - 06:42 AM
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William_Wilson	RE: C++ Pause Command 5 Jul, 2007 - 07:33 AM Post #10
lost in compilation Joined: 23 Dec, 2005 Posts: 4,101 Thanked: 25 times Dream Kudos: 3275 Expert In: Java, C, Javascript My Contributions	i agree with not using system("pause"); i have also run into circumstances where it will run before the code is completed.. since the system call can cause an interrupt which halts the code which called it. I found if you include conio.h that the following works quite well, and allows a single character to be entered, without being visible: CODE cout<<"Press any key to continue..."; cin.ignore(0,'\n'); getch();
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theholygod	RE: C++ Pause Command 5 Jul, 2007 - 10:41 AM Post #11
D.I.C Head Joined: 5 Feb, 2006 Posts: 223 My Contributions	None of your methods seem to be working for me! am i using the wrong header? im using iostream sleep(5); didnt compile (im using bloodshed), system("pause"); didnt do anything at all and Xings method didnt do anything and i didnt understand the code anyway. Maybe im overlooking something really stupid?
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William_Wilson	RE: C++ Pause Command 5 Jul, 2007 - 10:58 AM Post #12
lost in compilation Joined: 23 Dec, 2005 Posts: 4,101 Thanked: 25 times Dream Kudos: 3275 Expert In: Java, C, Javascript My Contributions	they are: Sleep(5); System("PAUSE"); but these are not the best solutions, but they should compile
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