Ubuntu manuals

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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.
 

DESCRIPTION

        The  sqrt()  function  returns  the  non-negative square root of x.  It
        fails and sets errno to EDOM, if x is negative.
 

ERRORS

        EDOM   x is negative.
        SVr4, 4.3BSD, C89.  The float and long double variants are C99 require‐
        ments.
        cbrt(3), csqrt(3), hypot(3)
 
                                   2002-07-27                           SQRT(3)