How to print the multiples of 2?

[DetectiveRawr]

I remember this part but I can't just figure it out.. My current code:

/* Make a program that keeps printing the multiples of the integer 2. */
#include <iostream>

using namespace std;

int main()
{
    int total;

    while(true)
    {
        cout << " " << total << endl;
        total*2;
    }

    return 0;
}

Don't give me answers, maybe hints will help!

[Phil123]

int total;
total*2; // hint, these may or may not contain errors :) 

[Volatile Pulse]

Also, avoid infinite loops at all costs. They're very bad programming technique.

Edit: total*2; shouldn't result in an error, but possibly a warning.

[DetectiveRawr]

Yeah Ik Volatile. I used infinite cuz it told me too.

[Bufflez]

Your just missing one character
total*2; <-- somewhere in here =D

[Bufflez]

also, it is a good idea to initialize variables as soon as you make them.

[Bufflez]

Woah wait a second. are you getting the error:

ld.exe cannot open output file bin\Debug\C++codes.exe Permission denied

?

[HiteshVaghani1]

you are not assigning your value of total * 2 in any thing..

[DetectiveRawr]

XD oh... I forgot about that.

[Zephilinox]

Bufflez, that happens because you close the terminal before it gets a chance to load the program, the terminal processes is still active, you need to kill it through a task manager, then you re-run it.

I use infinite loops frequently, just breaking out of them when I need to, it's better than goto and uses less memory than if I had some arbitrary bool value for every while loop.

[helios]

that happens because you close the terminal before it gets a chance to load the program, the terminal processes is still active

This just doesn't happen. Closing the console terminates the program running on it. I believe the program gets a SIGINT to get a chance to quit cleanly.

[Zephilinox]

You're right, it doesn't make sense, but it happens to me all the time using Code::Blocks and that seems to be how I cause it, so what else can I say?

[helios]

Code::Blocks is a special case because it doesn't run the program directly. You'll notice that at the end it displays its run time and waits for a key press. The regular console doesn't do this. What Code::Blocks does is run a program that itself runs the user's program. Now, what happens to the child process, I have no clue.

[j2NvC542]

Zephilinox, if you 'x' out a running program in Code::Blocks in debug mode, it is still "debugging". To stop the debug process, you need to "abort" it. It's on the line where there is also a button for "compile" and "run" and such.

[Zephilinox]

Aborting usually doesn't work for me, and by debug mode do you mean in contrast with release? or as in actually using a debugger? because I don't use debuggers that often.

[j2NvC542]

In contrast to release.

[Bufflez]

So, then what do I do to make the program run? (I'm using Code::Blocks)

[Zephilinox]

you can either do what I suggested, and kill it via a terminal or gui application (in Windows 7 press ctrl-shift-esc, click processes tab, find program, end process), bools suggestion of pressing abort (which hasn't worked for me in the past, but may for you) or as a last resort restart your PC.

[vlad from moscow]

It is not a simple task as it seems at the first glance. Below is the corresponding code. I restricted the range of values to the type char because for the int type the output will be too big.

#include <iostream>
#include <limits>

int main()
{
	for ( char i = 1; i < std::numeric_limits<char>::max(); i++ )
	{
		if ( ( i + 1 & 1 ) == 0 ) std::cout << i + 1 << ' ';
	}

	return ( 0 );
}

[j2NvC542]

To end a program you can also try ctrl+z or ctrl+c.