Zogna is a calculator for NDS.

It supports:

1.Support “+ – * / ^ % ( )”
2.Support “sin cos tan” ,input is angle ,EXample: sin60
3.Support “asin acos atan” ,ouput is angle,example: asin0.5
4.Support “exp sqrt log ln”,example: ln2

http://forum.gbadev.org/viewtopic.php?t=16871