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# Operators in expressions

The following tables show operand types and results of arithmetical and logical operations.

When evaluating any expressions, there holds that if any operand in a calculation is invalid, the result is also invalid. However, an eval tag is exception, if the parameter "Replace Invalid values with 0" is set. Then it is evaluated as it is mentioned here.

## Arithmetical operators

Operator Operation Description Operand types Result type
+ addition Difference between two absolute times is calculated this way:
ATime - BTime = %SubTimeLocal(ATime, BTime)

All others combination of absolute and relative times with operators + and - are calculated this way:
ATime + RTime = %AddTimeLocal(ATime, RTime)

or

ATime - RTime = %AddTimeLocal(ATime, -RTime)

integer
real
boolean
time interval
integer
real
boolean
time interval
Operand 1 Operand 2
absolute time integer
real
relative time
integer
real
relative time
absolute time
absolute time
- subtraction Difference between two absolute times is calculated this way:
ATime - BTime = %SubTimeLocal(ATime, BTime)

All others combination of absolute and relative times with operators + and - are calculated this way:
ATime + RTime = %AddTimeLocal(ATime, RTime)

or

ATime - RTime = %AddTimeLocal(ATime, -RTime)

integer
real
boolean
time interval
integer
real
boolean
time interval
Operand 1 Operand 2
absolute time integer
real
relative time
absolute time
* multiplication   integer
real
boolean
integer
real
integer
/ division   integer
real
boolean
real
real
integer
- unary operator   integer
real
integer
real

In mathematical operations, operands of Boolean type are converted to Integer type as follows:

• TRUE -> 1
• FALSE-> 0

Note

• Result of an function of Boolean type may be converted to other type by the multiplying with the constant of the particular type. For example: %Flag(Object,@A)*1 gives a numerical type of the result value, i.e. Integer, Real.

## Logical operators

operator operation operand types result type
& logical multiplication boolean
integer
boolean
integer
! negation boolean boolean

Logical multiplication of two operands of INTEGER type represents decade form of logical multiplication performed between the corresponding bits of the both operands binary forms.

Example

179 & 217 = 145

 1 0 1 1 0 0 1 1 179 1 1 0 1 1 0 0 1 217 1 0 0 1 0 0 0 1 145

## Relational operators

operator operation operand types result type
= equal integer
real
absolute time
time interval
boolean
# unequal integer
real
absolute time
time interval
boolean
> greater integer
real
absolute time
time interval
boolean
< less than integer
real
absolute time
time interval
boolean
>= greater or equal integer
real
absolute time
time interval
boolean
<= less or equal integer
real
absolute time
time interval
boolean
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