g++ 3.2.X: undefined reference to `abs(int)'

[Daniel Heiserer]

hi,

I am sure that is a stupid error of mine, but why the hell
does this not work:
-------------------------------------------[color=blue]
>g++ test.cc[/color]
/tmp/ccUN1Hel.o: In function `main':
/tmp/ccUN1Hel.o(.tex t+0x26): undefined reference to `abs(int)'
collect2: ld returned 1 exit status
-------------------------------------------[color=blue]
> cat test.cc[/color]
#include <stdlib.h>
#include <stdio.h>

int main(){
int abs(int);
for (int jj=10;jj>=-10;jj--){
fprintf(stdout, "%d ===> %d\n",jj,abs(jj ));
}
return 0;
}
-------------------------------------------[color=blue]
>man 3 abs[/color]
ABS(3) Linux Programmer's
Manual ABS(3)
NAME
abs, labs, llabs, imaxabs - compute the absolute value of an
integer.
SYNOPSIS
#include <stdlib.h>

int abs(int j);
long int labs(long int j);
long long int llabs(long long int j);
-------------------------------------------
thanks, daniel

[Attila Feher]

Re: g++ 3.2.X: undefined reference to `abs(int)'

Daniel Heiserer wrote:[color=blue]
> hi,
>
> I am sure that is a stupid error of mine, but why the hell
> does this not work:
> -------------------------------------------[color=green]
>> g++ test.cc[/color]
> /tmp/ccUN1Hel.o: In function `main':
> /tmp/ccUN1Hel.o(.tex t+0x26): undefined reference to `abs(int)'
> collect2: ld returned 1 exit status
> -------------------------------------------[color=green]
>> cat test.cc[/color]
> #include <stdlib.h>
> #include <stdio.h>
>
> int main(){
> int abs(int);[/color]

You don't need the above line. <stdlib.h> declares abs so you must not do
it.

--
Attila aka WW

[Chris Dams]

Re: g++ 3.2.X: undefined reference to `abs(int)'

Daniel Heiserer <Daniel.Heisere r@bmw.de> writes:

Hello,
[color=blue]
>#include <stdlib.h>
>#include <stdio.h>[/color]

Should nowadays be:

#include <cstdlib>
#include <cstdio>

using namespace std;
[color=blue]
>int main(){
> int abs(int);[/color]

Remove this line, that will solve the error.
[color=blue]
> for (int jj=10;jj>=-10;jj--){
> fprintf(stdout, "%d ===> %d\n",jj,abs(jj ));
> }
> return 0;
>}[/color]

Bye,
Chris Dams