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 exception is an eval tag, if the parameter "Replace Invalid values with 0" is set. Then it is evaluated as it is mentioned here.
See also the topic Order of operators by the priority
Arithmetical operators
| Operator | Operation | Description | Operand types | Result type | |||
|---|---|---|---|---|---|---|---|
| + | addition | The 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 | |||
| absolute time | ||||||
| - | subtraction | The 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 | |||
| 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
- The result of a function of Boolean type may be converted to other types by multiplying by a 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 |
| | | logical addition | boolean | boolean |
| ! | negation | boolean | boolean |
Logical multiplication of two operands of INTEGER type represents a decadic form of logical multiplication performed between the corresponding bits of binary forms of both operands.
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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