[grobclaw]

I went to the "use my calculator yourself" page. The calculator looks nice but the interface is either awfull or I don't get it. I tried for 5 minutes to type in "1/5 + 1/5 + 1/5" and failed...

[rrobukef]

It's in reverse polish notation: let a be the sequence (1, "Enter", 5, "Enter", /) then press $a, $a, +, $a, +.