[c++] system("pause"); - Why is it wrong?

Here's a question that I don't quite understand:

The command, system("pause"); is taught to new programmers as a way to pause a program and wait for a keyboard input to continue. However, it seems to be frowned on by many veteran programmers as something that should not be done in varying degrees.

Some people say it is fine to use. Some say it is only to be used when you are locked in your room and no one is watching. Some say that they will personally come to your house and kill you if you use it.

I, myself am a new programmer with no formal programming training. I use it because I was taught to use it. What I don't understand is that if it is not something to be used, then why was I taught to use it? Or, on the flip side, is it really not that bad after all?

What are your thoughts on this subject?

system("pause");  

is wrong because it's part of Windows API and so it won't work in other operation systems.

You should try to use just objects from C++ standard library. A better solution will be to write:

cin.get();
return 0;

But it will also cause problems if you have other cins in your code. Because after each cin, you'll tap an Enter or \n which is a white space character. cin ignores this character and leaves it in the buffer zone but cin.get(), gets this remained character. So the control of the program reaches the line return 0 and the console gets closed before letting you see the results.
To solve this, we write the code as follows:

cin.ignore();  
cin.get();  
return 0;

Here's one reason you shouldn't use it: it's going to piss off most anti-virus programs running on Windows if you're passing the program over to another machine because it's a security threat. Even if your program only consists of a simple cout << "hello world\n"; system("pause"); It's resource heavy and the program gets access to the cmd command, which anti viruses see as a threat.

• slow: it has to jump through lots of unnecessary Windows code and a separate program for a simple operation
• not portable: dependent on the pause program
• not good style: making a System call should only be done when really necessary
• more typing: System("pause") is longer than getchar()

a simple getchar() should do just fine.

It's all a matter of style. It's useful for debugging but otherwise it shouldn't be used in the final version of the program. It really doesn't matter on the memory issue because I'm sure that those guys who invented the system("pause") were anticipating that it'd be used often. In another perspective, computers get throttled on their memory for everything else we use on the computer anyways and it doesn't pose a direct threat like dynamic memory allocation, so I'd recommend it for debugging code, but nothing else.

the pro's to using system("PAUSE"); while creating the small portions of your program is for debugging it yourself. if you use it to get results of variables before during and after each process you are using to assure that they are working properly.

After testing and moving it into full swing with the rest of the solution you should remove these lines. it is really good when testing an user-defined algorithm and assuring that you are doing things in the proper order for results that you want.

In no means do you want to use this in an application after you have tested it and assured that it is working properly. However it does allow you to keep track of everything that is going on as it happens. Don't use it for End-User apps at all.

As listed on the other answers, there are many reasons you can find to avoid this. It all boils down to one reason that makes the rest moot. The System() function is inherently insecure/untrusted, and should not be introduced into a program unless necessary.

For a student assignment, this condition was never met, and for this reason I would fail an assignment without even running the program if a call to this method was present. (This was made clear from the start.)

You can use std::cin.get() from iostream:

#include <iostream> // std::cout, std::cin
using namespace std;

int main() {
   do {
     cout << '\n' << "Press the Enter key to continue.";
   } while (cin.get() != '\n');

   return 0;
}

Besides, system('pause') is slow, and includes a file you probably don't need: stdlib.h. It is platform-dependent, and actually calls up a 'virtual' OS.

For me it doesn't make sense in general to wait before exiting without reason. A program that has done its work should just end and hand over its resources back to its creator.

One also doesn't silently wait in a dark corner after a work day, waiting for someone tipping ones shoulder.

It's slow. It's platform dependent. It's insecure.

First: What it does. Calling "system" is literally like typing a command into the windows command prompt. There is a ton of setup and teardown for your application to make such a call - and the overhead is simply ridiculous.

What if a program called "pause" was placed into the user's PATH? Just calling system("pause") only guarantees that a program called "pause" is executed (hope that you don't have your executable named "pause"!)

Simply write your own "Pause()" function that uses _getch. OK, sure, _getch is platform dependent as well (note: it's defined in "conio.h") - but it's much nicer than system() if you are developing on Windows and it has the same effect (though it is your responsibility to provide the text with cout or so).

Basically: why introduce so many potential problems when you can simply add two lines of code and one include and get a much more flexible mechanism?

In summary, it has to pause the programs execution and make a system call and allocate unnecessary resources when you could be using something as simple as cin.get(). People use System("PAUSE") because they want the program to wait until they hit enter to they can see their output. If you want a program to wait for input, there are built in functions for that which are also cross platform and less demanding.

Further explanation in this article.

Because it is not portable.

pause

is a windows / dos only program, so this your code won't run on linux. Moreover, system is not generally regarded as a very good way to call another program - it is usually better to use CreateProcess or fork or something similar.

Using system("pause"); is Ungood Practice™ because

• It's completely unnecessary.
  To keep the program's console window open at the end when you run it from Visual Studio, use Ctrl+F5 to run it without debugging, or else place a breakpoint at the last right brace } of main. So, no problem in Visual Studio. And of course no problem at all when you run it from the command line.

• It's problematic & annoying
  when you run the program from the command line. For interactive execution you have to press a key at the end to no purpose whatsoever. And for use in automation of some task that pause is very much undesired!

• It's not portable.
  Unix-land has no standard pause command.

The pause command is an internal cmd.exe command and can't be overridden, as is erroneously claimed in at least one other answer. I.e. it's not a security risk, and the claim that AV programs diagnose it as such is as dubious as the claim of overriding the command (after all, a C++ program invoking system is in position to do itself all that the command interpreter can do, and more). Also, while this way of pausing is extremely inefficient by the usual standards of C++ programming, that doesn't matter at all at the end of a novice's program.

So, the claims in the horde of answers before this are not correct, and the main reason you shouldn't use system("pause") or any other wait command at the end of your main, is the first point above: it's completely unnecessary, it serves absolutely no purpose, it's just very silly.