Operators - Connect_CDC - connect_cdc_mimix_share - Latest

BEGIN RETURNS type;

Denotes the beginning of an unnamed complex expression

END;

Denotes the end of an expression.

DECLARE type var;

Defines a variable in a complex expression.

DECLARE type var = <value expr>

Defines a variable in a complex expression and initializes it to the value calculated by the value expr>.

FOR (init; test; incr){ };

Executes a command to iterate over a range of values. The general form of the for statement can be expressed like this:

for (initialization; termination; increment) {
statement
}

• The initialization expression initializes the loop. It is executed once at the beginning of the loop.

• The termination expression determines when to terminate the loop.This expression is evaluated at the top of each iteration of the loop. When the expression evaluates to false, the loop terminates.

• increment is an expression that gets invoked after each iteration through the loop.

• There can be one or more statements.

All these components are optional. In fact, to write an infinite loop, you omit all three expressions.

WHILE ( ){ };

Executes a command while a specified condition is true.

DO ( ) { };  

Executes a command to evaluate the expression at the bottom of a loop instead of at the top. Thus the statements associated with a do are executed at least once.

IF ( ) { } ELSE ( );

Executes a command only if a specific condition is met; otherwise, executes another command.

SWITCH ( ) { };

Evaluates a variable that can later be matched with a value specified by the CASE keyword in order to execute a group of statements.

CASE val;

Defines a group of statements to begin executing if a value specified matches the value defined by a preceding SWITCH keyword.

DEFAULT;  

Optionally used after all CASE conditions in a SWITCH statement. If all CASE conditions are not matched by the value of the SWITCH variable, the DEFAULT keyword will be executed.

BREAK;

Forces an immediate exit from a loop.

RETURN val;

Executes a command to exit from the current method. The flow of control returns to the statement that follows the original method call.

To return a value, put the value (or an expression that calculates the value) after the return keyword:

return ++count;

==

Is equal.

!=

Is inequal.

>=

Is greater than or equal to.

<=

Is less than or equal to.

>

Is greater than.

<

Is less than.

&&

And

||

Either/or

!

Not

+

Addition

-

Subtraction

*

Multiplication

/

Division

%

Remainder (or mod)

,

Delimiter, separates items.

CR

Starts a new line. The CR can be used when coding expressions and is ignored by the expression parser.

/* comments */

Places comment text.

Type

CHAR(acter)

DEC(imal)

BOOLEAN

DOUBLE

INT(eger)