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Full Discussion: C Library reference error using sqrt() - will not compile.
Top Forums Programming C Library reference error using sqrt() - will not compile. Post 302469608 by plastichead on Sunday 7th of November 2010 06:49:41 AM
Old 11-07-2010
Power C Library reference error using sqrt() - will not compile.
This so basic that it should work.... Any ideas would be appreciared. Using a number directly in the sqrt allows it to compile.
Code:
primrose > cat a.c
 
#include <stdio.h>
#include <math.h>
int main(void)
{
double abcd=9;
printf("%f\n",sqrt(abcd));
}
 
primrose > gcc a.c
Undefined first referenced
symbol in file
sqrt /var/tmp//ccm7jh8O.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status
 
primrose >

Last edited by Scott; 11-07-2010 at 06:42 PM.. Reason: Please use code tags
 

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LEARN ABOUT SUSE

sqrt

SQRT(3) 						     Linux Programmer's Manual							   SQRT(3)

NAME

       sqrt, sqrtf, sqrtl - square root function

SYNOPSIS

       #include <math.h>

       double sqrt(double x);
       float sqrtf(float x);
       long double sqrtl(long double x);

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sqrtf(), sqrtl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION

       The sqrt() function returns the nonnegative square root of x.

RETURN VALUE

       On success, these functions return the square root of x.

       If x is a NaN, a NaN is returned.

       If x is +0 (-0), +0 (-0) is returned.

       If x is positive infinity, positive infinity is returned.

       If x is less than -0, a domain error occurs, and a NaN is returned.

ERRORS

       See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

       The following errors can occur:

       Domain error: x less than -0
	      errno is set to EDOM.  An invalid floating-point exception (FE_INVALID) is raised.

CONFORMING TO

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

       cbrt(3), csqrt(3), hypot(3)

COLOPHON

       This  page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

								    2008-08-05								   SQRT(3)
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