Joy-of-Postfix

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