Rockwell Automation 2098-IPD-xxx Ultra5000 C Programming using the Motion Library - Manual (Page 32)

Publication 2098-PM001E-EN-P — July 2002
1-20 Programming Motion Control in C
lists the precedence and describes the functions and any limitations
placed on the arithmetic operations in C.
Operator: Precedence: Function: Limitations:
* 1 Multiplies the value on its
right by the value on its
left.
/ Divides the value at its left
by the value on its right. Answer is truncated if
both operands are
integer or long.
% Yields the remainder when
the value at its left is
divided by the value to it
right. Integer or long
++ 2 In the prefix mode, adds 1
to the value of the variable
to its right, before the value
is used.
In the suffix mode, adds 1
to the value of the variable
to its left, after the value
was used. If n is 5, then x = ++n
sets x to 6, but x = n++
sets x to 5.
(incrementing n after
its value is used). In
both cases
n becomes
6 ).
-- In the prefix mode,
subtracts 1 from the value
of the variable to its right.
In the suffix mode,
subtracts 1 from the value
of the variable to its left. If n is 5, then x = --n
sets x to 4, but x = n--
leaves x at 5
(decrements n after its
value is used). In both
cases
n becomes 4).
+
(unary form)
3 Changes the sign of the
value on its right.
-
(unary form)
Changes the sign of the
value on its right.
+
(binary form)
4 Adds the value at its right
to the value at its left.
-
(binary form)
Subtracts the value at its
right from the value at its
left.