Echelon Neuron C - Manual (Page 17)

Neuron C Programmer’s Guide 5
0x0 .. 0x7F
signed short
0x80 .. 0xFF
unsigned short
0x100 .. 0x7FFF
signed long
0x8000 .. 0xFFFF
unsigned long
Octal constants have the following default types, which can also be modified as
described above with the u, U, l, and L suffixes:
0 .. 0177
signed short
0200 .. 0377
unsigned short
0400 .. 077777
signed long
0100000 .. 0177777
unsigned long
Binary constants have the following default types, which can also be modified as
described above with the u, U, l, and L suffixes:
0b0 .. 0b01111111
signed short
0b10000000 .. 0b11111111
unsigned short
0b0000000100000000 .. 0b0111111111111111
signed long
0b1000000000000000 .. 0b1111111111111111
unsigned long
Neuron C Variables
The following sections briefly discuss various aspects of variable declarations.
Data types affect what sort of data the variable represents. Storage classes affect
where the variable is stored, whether it can be modified (and if so, how often),
and whether there are any device interface aspects to modifying the data.
Neuron C Variable Types
Neuron C supports the following C variable types. The keywords shown in
square brackets are optional; if omitted, they are assumed by the Neuron C
language, per the rules of the ANSI C standard.
[signed] long [int] 16-bit quantity
unsigned long [int] 16-bit quantity
signed char 8-bit quantity
[unsigned] char 8-bit quantity
[signed] [short] [int] 8-bit quantity
unsigned [short] [int] 8-bit quantity
enum 8-bit quantity (int type)
Neuron C provides some predefined enum types. One example is shown below:
typedef enum {FALSE, TRUE} boolean;
Neuron C also provides predefined objects that, in many ways, provide the look
and feel of an ANSI C language variable. These objects include Neuron C timer
and I/O objects. See the I/O Model Reference for more details on I/O objects, and
see the Timers chapter in the Neuron C Reference Guide for more details on
timer objects.
The extended arithmetic library also defines float_type and s32_type for IEEE
754 and signed 32-bit integer data respectively. These types are discussed in
great detail in the
Functions chapter of the Neuron C Reference Guide .