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Full Discussion: sqrt
Top Forums Programming sqrt Post 22384 by CreamHarry on Monday 3rd of June 2002 02:58:33 AM
Old 06-03-2002
sqrt

Hi!

when i'm trying to compile this lite example
on my linux machine I'll get errors and i don't know why..

#include <stdio.h>
#include <math.h> /* needed by sqrt() */

int main()
{
printf("%f", sqrt(10.0));

return (0);
}

this is the error:
/tmp/cc33hNVHK.o: In function `main`:
/tmp/cc3hNVHK.o(.text+0x14): undefined reference to `sqrt`
collect2: ld returned 1 exit status
 

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sqrt(3M)						  Mathematical Library Functions						  sqrt(3M)

NAME
sqrt, sqrtf, sqrtl - square root function SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <math.h> double sqrt(double x); float sqrtf(float x); long double sqrtl(long double x); DESCRIPTION
These functions compute the square root of their argument x. RETURN VALUES
Upon successful completion, these functions return the square root of x. For finite values of x < -0, a domain error occurs and either a NaN (if supported) or an implementation-defined value is returned. If x is NaN, a NaN is returned. If x is +-0 or +Inf, x is returned. If x is -Inf, a domain error occurs and a NaN is returned. ERRORS
These functions will fail if: Domain Error The finite value of x is < -0 or x is -Inf. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the invalid floating-point exception is raised. The sqrt() function sets errno to EDOM if the value of x is negative. USAGE
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions. An application can also set errno to 0 before calling sqrt(). On return, if errno is non-zero, an error has occurred. The sqrtf() and sqrtl() functions do not set errno. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.11 12 Jul 2006 sqrt(3M)

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