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4tH is a Forth compiler with a little difference. Instead of the standard Forth engine it features a conventional compiler. 4tH is a very small compiler that can create bytecode, C-embeddable bytecode, standalone executables, but also works fine as a scripting language. It supports about 95% of the ANS Forth CORE wordset and features conditional compilation, pipes, files, assertions, forward declarations, enumerations, structures, suspended execution, recursion, include files, etc. It comes with an RPN calculator, line editor, compiler, decompiler, C-source generator, a virtual machine, and a multitasking environment. License: GNU Lesser General Public License (LGPL) Changes:
A default 4tH directory can be defined by setting an environment variable. Support for creating custom 4tH implementations was added. The multitasking environment is scriptable now. The library files concerning ANS Core Extensions, table searching, and interpretation have been rewritten or replaced.

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