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    Command:

    sqrtl

    
    
    

    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 || _POSIX_C_SOURCE >= 200112L;
               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)
    
                                      2010-09-20                           SQRT(3)
    
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