User:Garykline/Ch interpreter
- This is a copy of the deleted page Ch interpreter, see that page's deleted history for attribution.
Ch /ˌsiːˈeɪtʃ/ is a cross-platform C and C++ interpreter.
Ch was originally designed by Dr. Harry H. Cheng as a scripting language for beginners to learn math, computing, numerics and programming in C/C++.
It is now provided by SoftIntegration, Inc. Ch is written in C and runs under Windows, Linux, Mac OS X and some versions of Unix. It supports C90 and major C99 features, but it does not support the full set of C++ features. C99 complex and VLA features are supported in Ch before they become C99 standard. Ch can also be run as a interactive shell to execute C statement, C script file, unix commands and Windows commands(under windows only).
Features
[edit]C/C++ interpreter
[edit]Ch supports the 1999 ISO C Standard (C99) and C++ classes. It is a superset of C with C++ classes. C99 major features such as complex numbers, variable length arrays (VLAs), IEEE-754 floating-point arithmetic and generic mathematical functions are supported. Wide characters in Addendum 1 for C90 is also supported.
The following C++ features are available in Ch:
- Member function
- Mixed code and declaration
- The this-> pointer
- Reference type and pass-by-reference
- Function-style type conversion
- Class
- private/public data and functions in class. Ch is compatible with C++ 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 cout, cerr, cin with endl
- Arguments for variadic functions are optional
Ch supports classes in C++ with the following additional capabilities:
- Classes inside member functions
- Nested functions with classes
- Pass member function to argument of pointer-to-function type of functions
Embeddable scripting
[edit]As a C/C++ interpreter, Ch can be used as a scripting engine for your applications. The pointer to array or variables can be passed and shared in both binary C space and ch scripting space. It extends your applications with a C compatible scripting language.
Shell programming and cross-platform scripting
[edit]Ch is a C-compatible shell similar to C-shell (csh). It can be used as login shell. Ch has a built-in string type for automatic memory allocation and de-allocation. It supports shell alias, history, filename wildcarding, piping and iteration etc.
2D/3D plotting and numerical computing
[edit]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.
Examples
[edit]"Hello, world!" in Ch
[edit]There are two ways to run Ch code. One is:
printf("Hello world!\n");
Another is:
#include <stdio.h> int main() { printf("Hello world!\n"); }
Ch also supports interactive shell command and C statements.
> int i, *p, **p2 // i is an integer, p pointer, p2 double pointer > i=10 // i is assigned value 10 10 > p=&i // p points to address of i 00D847C0 > *p // the memory pointed by p has value 10 10 > p2=&p // p2 points to address of p 00D84D30 > **p2 // the memory pointed by the pointer at p2 has value 10 10 >
Numerical computing in Ch
[edit]#include <stdio.h> #include <array.h> int main() { array double A[2][3] = {1, 2, 3, 4, 5, 6}; array double B[3][2]; printf("A= \n%f \n", A+A); B = 2*transpose(A); printf("B= \n%f \n", B); }
The output is:
A= 2.000000 4.000000 6.000000 8.000000 10.000000 12.000000 B= 2.000000 8.000000 4.000000 10.000000 6.000000 12.000000
Shell programming
[edit]Find and compile all .c files into .o in the current directory for which the .o file is old or absent:
#!/bin/ch #include <sys/stat.h> struct stat cstat, ostat; string_t c, o; foreach (c; `find . -name "*.c"`) { o=`echo $c | sed 's/.c$/.o/'`; stat(o, &ostat); stat(c, &cstat); if (ostat.st_mtime > cstat.st_mtime) { echo "compiling $c to $o"; gcc -c -o "$o" "$c"; } }
2D/3D plotting in Ch
[edit]To plot a sine wave:
#include <math.h> #include <chplot.h> int main() { int numpoints = 36; array double x[numpoints], y[numpoints]; linspace(x, 0, 360); // assign x with values from 0 to 360 linearly y = sin(x*M_PI/180); plotxy(x, y, "Ch plot", "xlabel", "ylabel"); }
Further reading
[edit]- Cheng, Harry (1993). "Handling of Complex Numbers in the Ch Programming Language". Scientific Programming: 76–106.
- Cheng, Harry (1993). "Scientific Computing in the Ch Programming Language". Scientific Programming: 49–75.
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(help) - Cheng, Harry (1995). "Extending C and FORTRAN for Design Automation". ASME Trans., Journal of Mechanical Design: 390–395.
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(help) - Cheng, Harry (1995). "Extending C with arrays of variable length". Computer Standards & Interfaces: 375–406.
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(help) - Cheng, Harry (2002). "C99 & Numeric Computing". Dr. Dobb's Journal: 28–34.
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(help) - Cheng, Harry (2006). "Ch: A C/C++ Interpreter for Script Computing". Dr. Dobb's Journal: 6–12.
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(help) - Wang, Zhaoqing; Cheng, Harry (2006). "Portable C/C++ Code for Portable XML Data". IEEE Software: 76–81.
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(help) - Cheng, Harry (2009). "Speeding-Up Software Development Using Embedded Scripting". Dr. Dobb's Journal: 8–8.
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(help) - Cheng, Harry (2009). "C for the Course". ASME Mechanical Engineering Magazine: 50–52.
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(help) - Cheng, Harry (2009). C For Engineers & Scientists, An Interpretive Approach. McGraw-Hill. ISBN 978-0077290467.
References
[edit]- Heller, Martin (2001). "The Ch Language Environment". Byte Magazine.
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(help) - Glassborow, Francis (2001). "The Ch Language Environment Version 2.0". C Vu Magazine: 36–37.
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(help) - Wang, Gary (2002). "Ch Solves Portability Headaches". IEEE Spectrum.
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(help) - Campbell, Matt (2003). "Ch, A C/C++ Interpreter -- New possibilities for people who like C and Unix". MACTECH, the journal of Apple technology.
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(help) - Wilson, Matthew (2004). "Open-RJ and Ch". Dr. Dobb's Journal.
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(help) - Huber, Tom (2010). "An Introduction to C and Ch: Your One-Stop Shop for Scientific Computing". IEEE Computing in Science and Engineering.
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(help) - Liu, Li; Wang, Zhaoqing; Jiang, Xusheng (2010). "Anchor-based programming teaching embedded with Ch platform". Mechatronics and Embedded Systems and Applications (MESA), 2010 IEEE/ASME International Conference: 49–52.
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See also
[edit]External links
[edit]- SoftIntegration Home Page
- C99 features in Ch
- Ch Shell
- SQLite in Ch
- Perl Compatible Reg. Expressions in Ch
- ChScite
- Ch Mini-XML
- GNU Scientific Library in Ch
- Ch libxml2 package
- ChOpenAL