Programming Forums > Application Development > C++

chillypacman · Mar 14th, 2006, 1:21 AM

Everytime I put the return 0; command that you have to for apps like 'hello world' so that you need to press enter before the app closes doesnt work using visual studio 2005.

can someone help me?

Jimbo · Mar 14th, 2006, 1:33 AM

return 0; doesnt make the program wait. Although in VS, if you don't run in debug mode, it should pause on its own (using Ctrl-F5). Otherwise, look here.

chillypacman · Mar 14th, 2006, 5:30 AM

Thanks for the link, I'll try that when I can get back on the computer with the compiler

Umm, I dont understand why return 0; isnt working anymore, I remember I had compiled a 'hello world' app sometime ago with another c++ compiler and it worked, is this a general change to how c++ works?

UnKnown X · Mar 14th, 2006, 6:03 AM

As Jimbo said, return 0; does not make the programme wait. On the contrary, it returns the value 0 to the calling function/programme and in this case, it closes the programme.

If you want it to wait, add something like:

(Toggle Plain Text)

#include <iostream>
int main()
{
    // code
    std::cin.sync();
    std::cin.get();
    return 0;
}

Bench · Mar 14th, 2006, 9:55 AM

Quote:

Originally Posted by chillypacman

Thanks for the link, I'll try that when I can get back on the computer with the compiler

Umm, I dont understand why return 0; isnt working anymore, I remember I had compiled a 'hello world' app sometime ago with another c++ compiler and it worked, is this a general change to how c++ works?

Nothing to do with C++ - blame your old compiler for misleading you. it has been secretly adding an extra line to the end of your main() function, letting your program pause before it ends.

.TD · Mar 14th, 2006, 2:47 PM

You should learn what return 0 actually means. I know in Java System.exit(0) means that the program completed correctly and System.exit(1) (C++ equiv of return 1; at the end of main) means there is an error, but depending on how you work returning 0 and 1 could mean correct execution or error in the program.

That was probably rather unclear, someone else (who has more experience of C/C++) feel free to clarify. One more thing, why do people use the M$ products Vis Stuido n so on, is it because its easy to make GUIs like in Delphi or just don't they care about the non-portability and so on of their code?

Ooble · Mar 14th, 2006, 3:06 PM

.TD, you can code portably in Visual Studio - you just can't use .NET (well, you can, but the Mono project doesn't support everything yet).

Generally, in most OSes, returning an exit code of 0 means the program executed successfully - anything else is an error code. return 0; has nothing to do with making your program wait - it simply tells the operating system your program is exiting with an exit code of 0.

As UnKnown X said, use std::cin.get() to request input and stall the exiting.

DaWei · Mar 14th, 2006, 3:39 PM

Quote:

just don't they care about the non-portability and so on of their code?

Dint yo mama tell you not bleeve everthang ya hear?

PPoA · Mar 15th, 2006, 2:56 AM

Quote:

Originally Posted by .TD

One more thing, why do people use the M$ products Vis Stuido n so on?

I use VStudio because that's what my school uses and they let you install it for free. They have some kind of agreement with Microsoft so they can let students install it. Still have to fill out the ULA though.

bl00dninja · Mar 18th, 2006, 12:32 AM

wtf???

my first problem with vs 2005 was the precompiled header stdafx.h being automatically included in all win32 console projects. figured it out...yay. it automatically inserts a system("pause") (or something that acts just like it after your code)...i don't understand what you mean.

but if it's not...just do the cin.get() deal and it'll be fine.

Mar 14th, 2006, 1:21 AM	#1
chillypacman Newbie Join Date: Mar 2006 Posts: 21 Rep Power: 0	return 0; not working in c++ in visual studio 2005? Everytime I put the return 0; command that you have to for apps like 'hello world' so that you need to press enter before the app closes doesnt work using visual studio 2005. can someone help me?

Mar 14th, 2006, 6:03 AM	#4
UnKnown X Hobbyist Programmer Join Date: Dec 2005 Location: Sandvika, Norway Posts: 114 Rep Power: 0	As Jimbo said, return 0; does not make the programme wait. On the contrary, it returns the value 0 to the calling function/programme and in this case, it closes the programme. If you want it to wait, add something like: (Toggle Plain Text) #include <iostream> int main() { // code std::cin.sync(); std::cin.get(); return 0; } #include <iostream> int main() { // code std::cin.sync(); std::cin.get(); return 0; }

Mar 14th, 2006, 2:47 PM	#6
.TD Programmer Join Date: Feb 2006 Location: UK Posts: 36 Rep Power: 0	You should learn what return 0 actually means. I know in Java System.exit(0) means that the program completed correctly and System.exit(1) (C++ equiv of return 1; at the end of main) means there is an error, but depending on how you work returning 0 and 1 could mean correct execution or error in the program. That was probably rather unclear, someone else (who has more experience of C/C++) feel free to clarify. One more thing, why do people use the M$ products Vis Stuido n so on, is it because its easy to make GUIs like in Delphi or just don't they care about the non-portability and so on of their code? __________________ Go away before I replace you with a very small shell script. -- Get FireFox!

Mar 14th, 2006, 3:06 PM	#7
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	.TD, you can code portably in Visual Studio - you just can't use .NET (well, you can, but the Mono project doesn't support everything yet). Generally, in most OSes, returning an exit code of 0 means the program executed successfully - anything else is an error code. return 0; has nothing to do with making your program wait - it simply tells the operating system your program is exiting with an exit code of 0. As UnKnown X said, use std::cin.get() to request input and stall the exiting. __________________ Me :: You :: Them

Mar 18th, 2006, 12:32 AM	#10
bl00dninja Programming Guru Join Date: Oct 2004 Location: namespace std Posts: 1,246 Rep Power: 5	wtf??? my first problem with vs 2005 was the precompiled header stdafx.h being automatically included in all win32 console projects. figured it out...yay. it automatically inserts a system("pause") (or something that acts just like it after your code)...i don't understand what you mean. but if it's not...just do the cin.get() deal and it'll be fine. __________________ i put on my robe and wizard hat... Have you ever heard of Plato, Aristotle, Socrates?...Morons.

Mar 14th, 2006, 1:33 AM	#2
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 751 Rep Power: 3	return 0; doesnt make the program wait. Although in VS, if you don't run in debug mode, it should pause on its own (using Ctrl-F5). Otherwise, look here.

Mar 14th, 2006, 5:30 AM	#3
chillypacman Newbie Join Date: Mar 2006 Posts: 21 Rep Power: 0	Thanks for the link, I'll try that when I can get back on the computer with the compiler Umm, I dont understand why return 0; isnt working anymore, I remember I had compiled a 'hello world' app sometime ago with another c++ compiler and it worked, is this a general change to how c++ works?

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Programming Forums > Application Development > C++

return 0; not working in c++ in visual studio 2005?