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Ch, (IPA pronunciation: [siː eɪtʃ]), is a commercial embeddable C/C++ interpreter. Ch is designed for using one C compatible language for all programming tasks.

Ch extends C and C++ for scripting, numerical computing and 2D/3D plotting, and embedded scripting. It can run in Windows, Linux, Mac OS X and various versions of Unix.

Contents 1 Features 1.1 C/C++ compatible interpreter 1.2 Embeddable scripting 1.3 Shell programming and cross-platform scripting 1.4 2D/3D plotting and numerical computing 2 Examples 2.1 "Hello, world!" in Ch 2.2 Numerical computing in Ch 2.3 Shell programming 2.4 2D/3D plotting in Ch 3 See also 4 External links

Ch supports the 1999 ISO C Standard (C99) and C++ classes. It is 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.

As a C/C++ interpreter, Ch can be used as a scripting engine for your applications. It extends your applications with a C compatible scripting language.

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.

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.

There are two ways to run Ch code. One is:

   #!/bin/ch
   printf("Hello world!\n");

Another is:

   #!/bin/ch
   #include 
   int main() {
       printf("Hello world!\n");
   }

Note: #!/bin/ch is optional.

   #include 
   #include 
   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 

Find and compile all .c files into .o in the current directory for which the .o file is old or absent:

   #!/bin/ch 
   #include  
   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"; 
       } 
   } 

To plot a sine wave:

  #include 
  #include 
  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");
   }

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