Joy of Postfix Calculator App for Android
APK-File can be downloaded
Reference-PDF can also be downloaded
or
Virus-Save Download on heise.de/Download:
JoyOfPostfix/App,
JoyOfPostfix/PDF in the Android Register. (both 20241122)
Subset of the programming language Joy for the postfix experience.
Tutorial of Joy but there are some modifications to Joy-of-Postfix
They are:
-
’ identifier is not a char, but a quotation of the identifier
-
there are no sets and no integers and no chars (for filter of strings use unpack and pack)
- it is only defined for one line with == at the second position and an identifier at the first position
-
there is no keyword DEFINE and no terminator at the end of the line
-
get and put are for dictionary use
- split2 is used for filtering two aggregates as a result
-
split and join are for splitted strings in a list
- type the CALC-Button to execute a line of functions or a definition
- type . for one output taken from the top of the stack
- type .s for the output of the reversed stack
- for side-effects there is a Monad to use at the end of a line, like: [program] [program] !
IMPORTANT: with dump and words and help you get an overview of the words or definitions that are used.
Data Types
- [ ] is the empty list (null)
- [a b c] is the non-empty list (cons)
- -123.456E-33 are double numbers (float)
- abc is an identifier (ident)
- “abc” is an unicode-string (string)
- true and false are booleans (bool)
- (x y z) is a comment
- # x y z is an end-of-line comment
Made by metazip