Echelon Neuron C - Manual (Page 26)

14 Overview
include file. Other ANSI C library functions, such as file I/O and storage
allocation functions, are not included in Neuron C. Consult the Neuron C
Reference Guide for a complete and detailed list.
• The Neuron C implementation includes three ANSI include files:
<stddef.h>, <stdlib.h>, and <limits.h>.
• Neuron C requires use of the function prototype feature whenever a call
to the function precedes the function definition (see Chapter 2, Focusing
on a Single Device , on page 15).
• Neuron C does not support the use of the ellipsis (...) in function
prototypes or definitions.
• Neuron C contains additional reserved words and syntax not found in
ANSI C. See the Neuron C Reference Guide for the syntax summary and
the list of reserved words.
• Neuron C supports binary constants in addition to octal and hexadecimal.
Binary constants are specified as 0b <binary_number> . For example,
0b1101 equals decimal 13.
• Neuron C supports the // comment style from C++, in addition to the
traditional /* */ C coment style. In the // style, two slashes (//) begin a
comment. The comment is terminated by the end of the line, without
further punctuation.
C code
/* An ANSI C and NEURON C comment */
C code // A line-style NEURON C comment
• The main( ) construct is not used. Instead, a Neuron C program’s
executable objects consist of when statements in addition to functions. A
thread of execution always begins with a when statement, as described in
Chapter 2, Focusing on a Single Device , on page 15.
• Neuron C does not support multiple source files in separate compilation
units (however, the #include directive is supported).
• The ANSI C preprocessor directives #if, #elif, and #line are not supported.
However, #ifdef, #ifndef, #else, and #endif are supported.
• The Neuron C implementation of the #error directive requires a double-
quoted string for the error message; the ANSI C directive does not.
See Appendix D, Neuron C Language Implementation Characteristics , on page
237 for a description of how the Neuron C language conforms to “implementation-
specific” aspects of the ISO and ANSI C language definitions.