sqrt

/*
 *  call-seq:
 *     Math.sqrt(numeric)    => float
 *  
 *  Returns the non-negative square root of <i>numeric</i>.
 */

static VALUE
math_sqrt(obj, x)
    VALUE obj, x;
{
    double d;

    Need_Float(x);
    errno = 0;
    d = sqrt(RFLOAT(x)->value);
    domain_check(d, "sqrt");
    return rb_float_new(d);
}