Calculator model with mod function? I'm wondering does anyone know of a scientific calculator with a mod function?

In C# this is shown as follows (just in case there are any other mods that a mathematical non-savant such as myself wouldn't be aware of)

5 % 4 = 1

I've looked through the most common ones on the web but the function is either not in the list or not present.

I have a little bit of a bias towards Casio calculators as that's what I'm familiar with but will accept any suggestions that can be currently purchased.

Derek
HP : buy a hewlett packard calculator. the model HP-35S contains hundreds of functions. 
there is a description here ; http://www.shopping.hp.com/product/calculator/Scientific/1/storefronts/F2215AA%2523ABA;HHOJSID=FW7TNQVJMqHh075qvYbPbRvjvx2K1ybHFyYXGDY9Vr8kpqFlknwg!492383249

The 32Sii used to have a button just for that, on the other hand the
HP35s is programmable and you can most probably do it easily.
The TI-36x pro has a mod button under the Math menu.