I believe most people (or aleast most Hongkongers) had used the casio fx-50f calculator before.
And the flsah calculator you see is an imitation of it.
This imitation include the mode 0 function, compact calculation, of fx50f only, but you will still find some function is absent.
They are:
1. The function that you have to enter twice, like x^y or nCr
2. Brackets
3. All function of mode7, 8 and 9
If you are interested in why I cannot or unwilling to finish these functions, just download the source.
The layout of the source is totally different from the calculator because it is a prototype only.
The function of the calculator is not complete with the casio fx50f, but all of the available functions is absolutely same as fx50f.
Made in Flash 8, used up ~200 hours
