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 sqrtl()                 Calculate Long Double Square Root

 #include   <math.h>
 #include   <errno.h>

 long double sqrtl(x);
 long double x;         Long double precision value

    This is the long double precision version of sqrt(); it
    calculates the long double precision square root of x, a long
    double precision value. See sqrt() for more information.

    Returns:    The square root of x if successful; 0 otherwise.

 Portability:   Not supported by the ANSI standard.