Very embarrassing C++ problem

[gamepad]

I posted this in another forum, but I think that forum might be dead. I decided to bring this problem to the attention of Anandtechers (w00t!).

I am just beginning my adventure into the world of programming and am having trouble with C++.

Whenever I copy paste example programs into Dev-C++ and compile and run, I only see the program for a split second before it disappears. If the program has input, it allows me to input information, but then it disappears again.

Look at this program for an example:

#include <iostream.h>

int main()
{

cout << "Hello, World!" << endl;

return 0;
}

When I run the program, it just flashes for a fraction of a second and disappears.

I'd be very grateful if someone can help me with this woe.

 

[Idontcare]

What exactly did you want it to do? Print "hello world" and then "hang" for a while with this message on the screen?

If so then you need to add a wait/pause/loopwhile-count or some such, otherwise the program appears to be doing exactly what you programmed it to do - print hello world and then close thereafter because all the code has been executed.

 

[gamepad]

Ah, thanks for explaining it to me.

 

[brandonb]

If you run it from a command prompt (the .exe after it compiles) it will display and bring you back to the command prompt when exiting.

 

[EagleKeeper]

Every command line noob has that problem.

Welcome to the world of Windows/DOS box programming.

 

[gamepad]

Originally posted by: brandonb
If you run it from a command prompt (the .exe after it compiles) it will display and bring you back to the command prompt when exiting.

Oh.. that makes sense. Good thing I have about a week of Linux experience under my belt.

 

[tfinch2]

getchar() is your friend.

 

[statik213]

Originally posted by: tfinch2
getchar() is your friend.

If it is not clear, throw a getchar() at the end of your program. This function call will wait until you press a key and return that key's value. So this should give you some time to see your output.

 

[imported_quasi]

In Dev C++ I've always used system("PAUSE").

 

[dababus]

Borland C++ 5.0

#include <iostream.h>
#include <stdio.h>

int main()
{

cout << "Hello, World!" << endl;

getchar();
return 0;
}

 

[Aikouka]

Or if you open a command prompt first, the window will not automatically close .

 

[Schadenfroh]

Originally posted by: quasi
In Dev C++ I've always used system("PAUSE").

Same here

 

[ahurtt]

add this as the last line of you main()

cin.get();

 

[hans007]

you can use getch or cin.get at the end.

 

[eakers]

you can always do a system("pause");

 

[exdeath]

Or you can just set the IDE flag that keeps the DOS box open after program termination instead of modifying your program...

 

[gamepad]

Originally posted by: exdeath
Or you can just set the IDE flag that keeps the DOS box open after program termination instead of modifying your program...

How do I do that?