What does Optional mean in VBA?
When you call a procedure with an optional argument, you can choose whether or not to specify the optional argument. If you don’t specify the optional argument, the default value, if any, is used. If no default value is specified, the argument would be for any variable of the specified type.
How do you send an optional parameter?
To implement the optional parameter first you need to add System. Runtime. InteropServices namespace in your program, then creates an optional parameter using the Optional keyword enclosed in square brackets before the definition of the parameter in the method. The default value of OptionalAttribut is zero.
Can parameters be optional?
The definition of a method, constructor, indexer, or delegate can specify its parameters are required or optional. Any call must provide arguments for all required parameters, but can omit arguments for optional parameters. Each optional parameter has a default value as part of its definition.
How do you make an optional parameter in VBA?
The optional parameter(s) must be at the end of the parameter list. The IsMissing function will work only with parameters declared as Variant . It will return False when used with any other data type. User defined types (UTDs) cannot be optional parameters.
How do I make an optional parameter in API?
Optional Parameters in Web API Attribute Routing and Default Values: You can make a URI parameter as optional by adding a question mark (“?”) to the route parameter. If you make a route parameter as optional then you must specify a default value by using parameter = value for the method parameter.
What does sub or function not defined mean in VBA?
“Sub or Function not Defined” is a compile error that occurs when VBA cannot find a procedure or other reference by name. A typo is the most common cause of this message.
Which are the three parameters used in macros?
The three macro parameter modes are: Name mode, in which the formal parameter is declared by just its name; list mode, in which the formal parameter name is surrounded by parentheses; and value mode, in which the formal parameter name is preceded by an equals sign.
What is parameterized macro?
A parameterized macro is a macro that is able to insert given objects into its expansion. This gives the macro some of the power of a function. As a simple example, in the C programming language, this is a typical macro that is not a parameterized macro: #define PI 3.14159.
What is optional parameter in VB net?
Optional parameters are indicated by the Optional keyword in the procedure definition. The following rules apply: Every optional parameter in the procedure definition must specify a default value. The default value for an optional parameter must be a constant expression.
How do you call a sub function in VBA?
By using the VBA “call Sub,” we can execute both the subprocedure in a single macro only. We just need to add the word “Call,” followed by a macro name. Look at the below graphic picture. I have mentioned the code as “Call Code_2” in the first subprocedure only.