Ch interpreter
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Ch (pronounced /ˌsiːˈeɪtʃ/) is a cross-platform C/C++ interpreter. It is useful for scripting, shell programming, 2D/3D plotting, numerical computing, and can be embedded in other applications to add scripting capability. Ch can be used for both server-side and client-side web development. It runs under Windows, Linux, Mac OS X and some versions of Unix.
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[edit] Features
[edit] C/C++ compatible interpreter
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.
[edit] Embeddable scripting
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.
[edit] Shell programming and cross-platform scripting
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.
[edit] 2D/3D plotting and numerical computing
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.
[edit] Examples
[edit] "Hello, world!" in Ch
There are two ways to run Ch code. One is:
#!/bin/ch
printf("Hello world!\n");
Another is:
#!/bin/ch
#include <stdio.h>
int main() {
printf("Hello world!\n");
}
Note: #!/bin/ch is optional.
[edit] Numerical computing in Ch
#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
[edit] Shell programming
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";
}
}
[edit] 2D/3D plotting in Ch
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");
}
