>atan_(.999) goes in .083 ms (P III 500 MHz).
It would go much slower in my own class, where numbers are stored as character data, and calculations like addition, subtraction, multiplication and division all have to loop through the digits in the string.
My class allows for almost unlimited precision; therefore I don't use the built-in atan() function.
Mainly, I am doing this for fun - it is nothing urgent. I posted the file in the UT download section, and I assume most users will mainly use the .Add(), .Subtract(), .Multiply() and .Divide() methods.
Hilmar.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)