Difference between revisions of "Recital Operators"
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===Execution Operator=== | ===Execution Operator=== | ||
===Concatenation of Strings and Other Data Types=== | ===Concatenation of Strings and Other Data Types=== | ||
| + | If SET STRICT is OFF, non-string expressions are automatically converted as they are added to a string. If SET STRICT is ON, expressions must be converted manually using the [[ETOS()]] or other [[:Category:Expressions and Type Conversion||data conversion functions]]. By default, STRICT is ON. | ||
| + | |||
| + | |||
| + | '''Example''' | ||
| + | <code lang="recital"> | ||
| + | set strict off | ||
| + | echo "This string can add numerics and dates etc. " + 100.89 + " " + date() | ||
| + | |||
| + | set strict on | ||
| + | echo "This string can add numerics and dates etc. " + str(100.89,6,2) + " " + etos(date()) | ||
| + | </code> | ||
===Summary=== | ===Summary=== | ||
Revision as of 13:40, 6 November 2009
Contents
Recital Operators
Assignment Operators
Values are assigned to memory variables using the the equals = operator or the inline assignment := operator.
cVAR1 = 'newer value' cVAR1 := 'newest value'
Note that the store command can also be used to assign valuesand can operate on more than one memory variable in a single command.
store 'new value' to cVAR1, cVAR2
Arithmetic Operators
Recital supports the use of the following Arithmetic Operators:
| Operator | Operation | Precedence |
|---|---|---|
| () | Parentheses | 1 |
| ** | Exponentiation | 2 |
| * | Multiplication | 3 |
| / | Division | 3 |
| % | Modulus/Remainder | 3 |
| + | Addition | 4 |
| - | Subtraction | 4 |
When dealing with Date data types, the operators work as follows:
| Operator | Operation |
|---|---|
| + | <expD> + <expN> returns a date plus the number of days specified in <expN>. |
| - | Returns the interval between the two dates as a number of days. |
Example
? 2*3^2 18 ? 2*25%7 1.00 ? date() + 30 - date() 30
Comparison Operators
The following Comparison Operators are supported in Recital:
| Operator | Operation |
|---|---|
| = | Equal To |
| == | Exactly Equal To / Matches Pattern |
| <> | Not Equal To |
| != | Not Equal To |
| # | Not Equal To |
| > | Greater Than |
| >= | Greater Than or Equal To |
| < | Less Than |
| <= | Less Than or Equal To |
The Comparison Operators are always evaluated from left to right.
Increment and Decrement Operators
The ++ operator is used to automatically increment a previously declared numeric memory variable by one. The ++ operator must be placed at the beginning of the command line.
Example
i=0 do while i <100 ++ i enddo
The -- operator is used to automatically decrement a previously declared numeric memory variable by one. The -- operator must be placed at the beginning of the command line.
Example
i=100 do while i > 0 --i enddo
String Concatenation Operator
When dealing with string data types, the + and - operators perform the following concatenation operations:
| Operator | Operation |
|---|---|
| + | Concatenate the right hand string to the end of the left hand string. |
| - | Concatenate the right hand string to the end of the left hand string after trimming the left hand string of trailing spaces. |
Example
? [Hello] + [ ] + [ World] Hello World ? [Hello ] - [ World] Hello World
String Search Operators
The following String Search Operators are supported in Recital:
| Operator | Operation |
|---|---|
| $ | Substring is Contained In |
| | | Contains Substring |
String Substitution Operator
Execution Operator
Concatenation of Strings and Other Data Types
If SET STRICT is OFF, non-string expressions are automatically converted as they are added to a string. If SET STRICT is ON, expressions must be converted manually using the ETOS() or other |data conversion functions. By default, STRICT is ON.
Example
set strict off echo "This string can add numerics and dates etc. " + 100.89 + " " + date() set strict on echo "This string can add numerics and dates etc. " + str(100.89,6,2) + " " + etos(date())
