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CH /ˌsiːˈeɪtʃ/ is a proprietary cross-platform C and C++ interpreter and scripting language environment. It was designed by Harry Cheng as a scripting language for beginners to learn mathematics, computing, numerical analysis (numeric methods), and programming in C/C++. Ch is now developed and marketed by SoftIntegration, Inc.. Free versions include the student edition, and the non-commercial Professional Edition for Raspberry Pi.

CH can be embedded in C and C++ application programs. It has numerical computing and graphical plotting features. CH is combined of both shell and IDE. CH shell combines the features of common shell and C language. ChIDE provides quick code navigation and symbolic debugging. It is based on embedded CH, Scite, and Scintilla.

CH is written in C and runs on Windows, Linux, macOS, FreeBSD, AIX, Solaris, QNX, and HP-UX. It supports C90 and major C99 features, but it does not support the full set of C++ features. C99 complex number, IEEE-754 floating-point arithmetic, and variable-length array features were supported in CH before they became part of the C99 standard. An article published by Computer Reseller News (CRN) named CH as notable among C-based virtual machines for its functionality and the availability of third-party libraries.

CH has many tool kits that extend its functions. For example, the CH Mechanism Toolkit is used for design and analysis of commonly used mechanisms such as four-bar linkage, five-bar linkage, six-bar linkage, crank-slider mechanism, and cam-follower system. CH Control System Toolkit is used for the design, analysis, and modelling of continuous-time or discrete-time linear time-invariant (LTI) control systems. Both tool kits include the source code.

CH has been integrated into free C-STEM Studio, a platform for learning computing, science, technology, engineering, and mathematics (C-STEM) with robotics. C-STEM Studio is developed by the UC Davis Center for Integrated Computing and STEM Education, offering a curriculum for K-12 students.

CH supports LEGO Mindstorms NXT and EV3, Arduino, Linkbot, Finch Robot, RoboTalk and Raspberry Pi, Pi Zero, and ARM for robot programming and learning. It can also be embedded into the LabVIEW system design platform and development environment.

Features

CH supports the 1999 ISO C Standard (C99) and C++ classes. It is a superset of C with C++ classes. Several major features of C99 are supported, such as complex numbers, variable length arrays (VLAs), IEEE-754 floating-point arithmetic, and generic mathematical functions. The specification for wide characters in Addendum 1 for C90 is also supported.

C++ features available in CH include:

• Member functions
• Mixed code and declaration
• The this -> pointer
• Reference type and pass-by-reference
• Function-style type conversion
• Classes
• Private/public data and functions in classes. Ch is compatible with C++ in that by default, members of a class definition are assumed to be private until a 'public' declaration is given
• Static member of class/struct/union
• Const member functions
• The new and delete operators
• Constructors and destructors
• Polymorphic functions
• The scope resolution operator
• The I/O functions cout, cerr, and cin with endl
• Arguments for variadic functions are optional

CH supports classes in C++ with added abilities, including:

• Classes inside member functions
• Nested functions with classes
• Passing member function to argument of pointer-to-function type of functions

CH can interact with existing C/C++ libraries and call C/C++ functions from CH script. As a C/C++ interpreter, CH can be used as a scripting engine and extension language for applications. Pointers to arrays or variables can be passed and shared in both C-compiled and CH scripting contexts. One example of an embedded CH scripting application is Mobile-C, which has been used for collaborative visualization of distributed mesh model.

CH has a built-in string type (string_t) for automatic memory allocation and de-allocation. It supports shell aliases, history, and piping.

CH has built-in 2D/3D graphical plotting features and computational arrays for numerical computing. A 2D linear equation of the form b = A*x can be written verbatim in Ch.

See also

• CINT
• Pike (programming language)

References

1. Veeraraghavan, Sriranga (2013). "An introduction to Ch: Implementing a temperature converter in Ch". ComputerWorld. {{cite journal}}: Cite journal requires |journal= (help)
2. Ch Shell
3. Ch IDE
4. Wang, Gary (2002). "Ch Solves Portability Headaches". IEEE Spectrum. 39 (6): 59. doi:10.1109/MSPEC.2002.1049264. S2CID 32477309.
5. Cheng, Harry (1993). "Handling of Complex Numbers in the Ch Programming Language". Scientific Programming: 76–106.
6. Cheng, Harry (1993). "Scientific Computing in the Ch Programming Language". Scientific Programming: 49–75. {{cite journal}}: Cite journal requires |journal= (help)
7. Cheng, Harry (1995). "Extending C and FORTRAN for Design Automation". ASME Trans., Journal of Mechanical Design: 390–395. {{cite journal}}: Cite journal requires |journal= (help)
8. Cheng, Harry (1995). "Extending C with arrays of variable length". Computer Standards & Interfaces. 17 (4): 375–406. doi:10.1016/0920-5489(95)00007-H.
9. Morejon, Mario (2006). "Ch Language Rivals Java Functionality". CRN. {{cite journal}}: Cite journal requires |journal= (help)
10. Cheng, Harry (2006). "Object-Oriented Interactive Mechanism Design and Analysis". Engineering with Computers. 21 (3): 237–246. doi:10.1007/s00366-005-0008-4. S2CID 16996625.
11. Zhu, Yong (2003). "An Object-Based Software Package for Interactive Control System Design and Analysis". Journal of Computing and Information Science in Engineering. 3 (4): 366–367. doi:10.1115/1.1630815. S2CID 17908643.
12. ch robot
13. ch finch
14. ch raspberry and arm
15. "Embedding a C/C++ Interpreter Ch into LabVIEW for Scripting".
16. Wilson, Matthew (2004). "Open-RJ and Ch". Dr. Dobb's Journal.
17. Cheng, Harry (2009). "Speeding-Up Software Development Using Embedded Scripting". Dr. Dobb's Journal. p. 8.
18. Wang, Li-rong; Bo, Yo; Hagiwara, I (2009). 2009 IEEE 10th International Conference on Computer-Aided Industrial Design & Conceptual Design. Computer-Aided Industrial Design & Conceptual Design, 2009. CAID & CD 2009. IEEE 10th International Conference. pp. 1127–1132. doi:10.1109/CAIDCD.2009.5375178. ISBN 978-1-4244-5266-8. S2CID 39307433.
19. Wang, Li-rong; Bo, Yo; Hagiwara, Ichiro (2009). An agent based collaborative simplification of 3D mesh model. Cdve'09. CDVE'09 Proceedings of the 6th international conference on cooperative design, visualization, and engineering. pp. 325–328. ISBN 9783642042645.
20. Campbell, Matt (2003). "Ch, A C/C++ Interpreter – New possibilities for people who like C and Unix". MACTECH, the journal of Apple technology. {{cite journal}}: Cite journal requires |journal= (help)
21. Cheng, Harry (2010). The Ch Language Environment (6.3 ed.). Davis, CA: SoftIntegration, Inc.
22. Glassborow, Francis (2001). "The Ch Language Environment Version 2.0". C Vu Magazine: 36–37. {{cite journal}}: Cite journal requires |journal= (help)

Further reading

• Heller, Martin (2001). "The Ch Language Environment". Byte. Archived from the original on November 16, 2001. {{cite journal}}: Cite journal requires |journal= (help)
• Cheng, Harry (2002). "C99 & Numeric Computing". Dr. Dobb's Journal. pp. 28–34.
• Cheng, Harry (2006). "Ch: A C/C++ Interpreter for Script Computing". Dr. Dobb's Journal. pp. 6–12.
• Cheng, Harry (2009). C For Engineers & Scientists, An Interpretive Approach. McGraw-Hill. ISBN 978-0-07-729046-7.
• Cheng, Harry (2011). C For Engineers & Scientists (Chinese ed.). Higher Education Press. ISBN 978-0-07-729046-7.

External links

• Official website, SoftIntegration
• Mobile-C: a Multi-Agent Platform for Mobile C/C++ Agents Home Page
• C-STEM Studio

• C programming language family
• Educational programming languages
• Interpreters (computing)
• Pedagogic integrated development environments