Rockwell-automation 2098-IPD-xxx Ultra5000 C Programming using the Mot Manual de usuario descargar pdf (Pagina 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.

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