Basic Characteristics RAPID

num Numeric values (registers)
Description
Example
Num is used for numeric values; e.g. counters.
The value of the num data type may be
- an integer; e.g. -5,
- a decimal number; e.g. 3.45.
It may also be written exponentially; e.g.2E3 (= 2*10 3 = 2000), 2.5E-2 (= 0.025).
Integers between -8388607 and +8388608 are always stored as exact integers.
Decimal numbers are only approximate numbers and should not, therefore, be used in
is equal to or is not equal to comparisons. In the case of divisions, and operations using
decimal numbers, the result will also be a decimal number; i.e. not an exact integer.
E.g. a := 10;
b := 5;
IF a/b=2 THEN As the result of a/b is not an integer,
this condition is not necessarily
... satisfied.
VAR num reg1;
.
reg1 := 3;
Predefined data
reg1 is assigned the value 3.
a := 10 DIV 3;
b := 10 MOD 3;
Integer division where a is assigned an integer (=3) and b is assigned the
remainder (=1).
The constant pi (π) is already defined in the system module BASE.
CONST num pi := 3.1415926;
RAPID Reference Manual 7-num-1