Ch Standard Demos
ISO C90 Standard
Wide characters
ISO C99 Standard
C++ features
Complex IEEE floating-point arithmetic
Assumed-shape arrays
Nested functions
Interactive C statement execution
Interactive command shell
Shell Programming
Safe Ch
Ch applets
String Type
Adjustable array bounds
Auto array bound checking
Socket/Winsock
POSIX
Unix utilities for Windows
Windows
GTK+
X/Motif
OpenGL
Toolkits Demos
CGI
ODBC
ChExcel
Ch Professional Demos
Computational array
Plotting
Numerical analysis
C LAPACK functions
Ch can do auto array boundary checking to prevent bug or crashing in advance. 
ch-4.5> int a[10]
ch-4.5> a[1] = 1
ch-4.5> a[10] = 2
     WARNING: subscript value 10 is greater than upper limit 9
ch-4.5>