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Before looking at the solution to the bug described above, we will go back to basics to make sure you understand what a feature is. This will be important to correct and solve the problem. If you’ve already understood the concept, you can skip it.

What is a function?

A code block that can be used several times can call up a function. The word reusable tells us that the function can be called up an unlimited number of times from anywhere in the project.

If we need to expand or modify an item already included in a function, we just do it in one place – in a function. It will process changes in the current where the function has been called.

A block of code with the name of a function that is called in different places is called the calling function, and the code line that calls the function is called the calling function.

Arguments in function

Suppose you have the necessary data to execute a block of function code by programming. This data can be entered in the same line as the name of the function.

These data are referred to as arguments or parameters in the programming. When you define a function, you can specify the type of these arguments and the names of the variables. However, this is not mandatory.

Based on the use of variable arguments in the code, we can also assume the type of these arguments.

Value returned in function

After starting the code block, information may appear indicating that the function wants to return to the call function. This is called a return value. Optionally, you can also specify the data type of the returned value when defining the function.

Determining a function with arguments and the return value

Function

Let’s imagine a position called up by the subprocedure to save the button on the student’s admission form. Let’s call the fn_SaveStudent function. The function takes all the values of the form fields from the GUI and inserts them into the database as a student record.

Arguments

Field values must be passed as arguments from the calling function to the called function.

Eligible value

The database in turn automatically generates the student card. The function can return this value to the call function, which in turn can display the student number in each field of the Application Form or in the message field.

Syntax of the function

Function < function name> ([arg1 [, arg2 [, arg3 [, …… ]).

 

Last Function

If the argument is an argument.

For example:

Sub – Procedure when clicking the save button
Private Sub cmdSave_Click()
strName = txtName.value
intAge = lstAge.value
strGen = lstgender.value
lngContact = txtcontact.Value
Call of the function fn_SaveStudent (strName, intAge, strGen, lngContact)
End Sub
fn_SaveStudent (strName As String, intAge As Integer, strGen As String, lngContact As Long) As String
‘ code to insert variable values into the database parameters and return the generated End Student Id
fnSaveStudent = strstudentId
End Function.

Integrated functions

These functions are predefined blocks of code provided by programming languages for different purposes. With VBA we have a wide range of integrated functions. Some examples are given below.

no Name of the function Brief description Syntax
1 Section Cut a line with a character as a separator. A series of words will be returned. PARTS [,] [,] [,] [,] [,] [,]
2 Cdbl Conversion of an expression to a duplicate of a data type CDBL ( )
3 chr Returns a string (character value) corresponding to the value transmitted as a parameter. Oh, my God. Oh, my God.
4 Environment Returns the middle part of the line if the start position and length are given. LLIN (, [, ])
5 On the left. Returns the left side of the line if the length is specified. LEFT…
6 It’s true. Returns the right side of the line, if the length is specified. RULE ( )
7 Cutting Cut the conductor and the final distance between the wires. Cutting ( )
8 Ucase Converts all characters of a string to uppercase letters Ucase ( )
9 Corpus Converts all characters from a string to lowercase letters Annex ( )
10 Tools Checks whether one line is an underlayer of another. If yes, the starting position will be returned, otherwise 0 will be returned. INSTR([] , , , [,] )
11 Right now. Returns the date and time of the current system now()
12 Cstr Converts the value of the transmitted parameter into a string cstr ( )
13 Val Returns the mathematical value of the parameter. Value ( )
14 Ltrim Removes leading spaces from the string and returns them. Ltreme
15 Rtrim Removes the spaces at the end of the string and returns it. Search
16 Date Returns the date of the current system Date ( )
17 Hello Returns the day of the transferred date setting. Day ()
 
18 Péché Returns the value of sin Sin ( <expression>)
19 Tanning Returns the value of the tangent Tan ( < expression>)
20 Chat Returns the value of Kotangent Cat ( < expression> )
21 Magazine Returns the logbook value Magazine ( <expression>)
22 Because, uh… Returning because Because ( < expression>)
23 Isnull Returns the boolean value depending on whether the parameter value is zero or not. Grown up.
24 Isnumeric Returns the boolean value depending on whether the parameter value is a numerical value or not. Isolated ( )
25 Rate Returns a duplicate of the value of the data type as an interest rate for a series of equal cash flows at regular intervals. COMMAND ( , , , , , [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [], [] )
26 Cint Conversion of a parameter value to an integer value scint ( )
27 Mkdyr Create a folder, i.e. create a folder. Macdir
28 Cvar Conversion of the parameter value to the value of the data type of the option RBAF (expression)
29 Ccur Converts the parameter value to the value of the currency type. Corn ( )
30 Date Converts the parameter value to the date Date ( )

Optional Arguments and Errors Non-optimal Argument

User-defined functions

For user-defined functions, arguments are considered optional or mandatory depending on whether the OPTIONAL keyword was used to define the parameters of the called function.

Example

In this retrievable function, no argument with an optional keyword is defined. So if the argument is not passed to the calling function, we get the error message Argument is not optional.

alt= Optional non-compile the error argument data-orig-width=1017 data-orig-height=441 data-ezsrc=http://server.digimetriq.com/wp-content/uploads/2020/12/1607260082_453_How-Do-You-Fix-Compile-Error-Argument-not-optional.png data-ez= />

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To solve this problem, we need to pass the parameter to the calling function or mark the rollno argument as optional. The following code fragment corrects the error.

Sub demo1()
Call fn_demo1(Baby Aneesh, A+)
End Sub
Function fn_demo1(strname, strgrade, Optional ByVal introllno as Integer)
‘Just show the values of all
parameters MsgBox student name : Name and vbCrLf and class: and strgrade & vbCrLf & roll no.: and intro
Final function

Integrated functions

For built-in functions, the syntax clearly indicates whether the parameters are optional or mandatory.

Example

Syntax of the distribution function of the above table :

PARTS [,] [,] [,] [,] [,] [,]

Here is only an expression, i.e. a string, a mandatory argument. This means that the code works successfully even if the last two optional arguments are not passed.

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However, if the mandatory argument is not passed, this will lead to a compilation error. The argument is not optional.

alt= Optional non-compile the error argument data-orig-width=655 data-orig-height=437 data-ezsrc=http://server.digimetriq.com/wp-content/uploads/2020/12/1607260083_707_How-Do-You-Fix-Compile-Error-Argument-not-optional.png data-ez= />

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To correct this compilation error, you must provide mandatory arguments when calling the function.

Conclusion

The compilation error discussed in this article is obvious if you understand the purpose and use of the functions in general. We must provide all mandatory arguments of the expected data type to avoid such compilation errors.

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