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FCL is the programming language of an Android app called Forth Calculator. It is a Forth dialect with optional local variables, complex data structures, quotations and Java interoperability.
```forth
: fib ( n1 n2 -- n1 n2 n3 ) 2dup + ;
: nfib ( n -- n* ) -> n ( local variable )
0 1 { fib } n times ; ( quotation )
: fib ( n -- n* ) -> n ( local variable )
0 1 { 2dup + } n times ; ( quotation )
```
Besides all the high-level features, FCL supports the traditional Forth programming structures and uses the same compilation model (compile/interpret mode, dictionary, immediate words, etc.) as traditional Forth systems.