Help using Ncurses

[Yes]

Well, I'm trying to teach myself how to use the Ncurses library, but I'm already having trouble with the Hello World program. When I try running it, I get these errors:

http://harrypottermovie7.com/upload/images/cqs1189458956c.png

I have no idea what that means...the "multiple definitions" seems sorta like I have multiple versions of Ncurses installed, and they're conflicting with each other, but that's just an uneducated guess. So, does anyone know what my problem might be?

Thanks.

[slavik]

post the code please (surrounded by code tags)

[Wybiral]

Yeah, if you post the code and the command you are using to compile it then we can definitely help figure out whats wrong.

[Yes]

#include <iostream>

#include <cstdlib>

#include <ncurses.h>

using namespace std;

int main()
{
initscr();
printw("Hello World !!!");
refresh();
getch();
endwin();

return 0;
}

[Yes]

The guide I'm using is written for C, and I'm using C++, would that be my problem?

[robdor]

No, that shouldn't be a problem. What is the command that you are using the compile it? I used the command below to compile and everything worked as expected.


g++ -lncurses -o test ncurses_test.cpp

[Yes]

My build command is


g++ -Wall -lncurses -o "%f"

where "%f" is replaced with the file name. Now I get these build errors:


/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

[xtacocorex]

Don't think you need the cstdlib.h in your includes.

[Yes]

Yeah, I know. But that's not what's causing the errors.

[dwhitney67]

My build command is


g++ -Wall -lncurses -o "%f"

where "%f" is replaced with the file name. Now I get these build errors:


/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

xtacocorex is right, you do not need to include cstdlib.h.

Aside from that, I tried your program on my system and it compiles and runs fine. I compiled using:

g++ -Wall ncurses.cpp -lncurses

Then I ran "a.out".

You may want to consider re-installing "build-essentials".

[Lux Perpetua]

My build command is


g++ -Wall -lncurses -o "%f"

where "%f" is replaced with the file name. Now I get these build errors:


/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

You're probably just forgetting to specify a source file. "-o file.cpp" means the compiled executable is to be called file.cpp, not that you want to compile file.cpp. Fixing that should fix your problem.

[Yes]

Ugh, I'm an idiot. I had my execute arguments screwed up. Thank's, it's all sorted out now.