Mathematical Library Functions                           sqrt(3M)



NAME
     sqrt, sqrtf, sqrtl - square root function

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

     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.

ERORS
     These functions will fail if:

     Domain Error    The finite value of x is < -0 or x is -Inf.

                     If the integer expression  (matherrhandling
                     &  MATHEREXCEPT)  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




SunOS 5.11          Last change: 12 Jul 2006                    1






Mathematical Library Functions                           sqrt(3M)



     An application wanting to check for exceptions  should  call
     feclearexcept(FEALEXCEPT) before calling these functions.
     On  return,  if  fetestexcept(FEINVALID    FEDIVBYZERO  
     FEOVERFLOW    FEUNDERFLOW)  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.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE 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          Last change: 12 Jul 2006                    2