Develop and test code - Quiz

Q: 3. Which of the following is examples of field types where a base enumeration shouldn't be used? Odd one out.

A. A posting type field
B. All other option not A transaction date field
C. A sales order status field
D. ABC Codes to rate customers, vendors or items

Correct Option: B
Remarks:

Explanation:

Justification: A, C, D

A posting type field typically represents a finite list of posting types. This can be represented as a radio button or drop down list on the user interface. A different numerical value can be associated with each literal value of posting type.
A transaction date field can have many different values and would be best represented by using the date time or UTC Date Time data type, not a base enumeration.
A sales order status field will contain a list of literal values to indicate the status of sales order. For example, “Delivered” can be one value. This list of different sales order statuses is represented by a base enumeration in AX.
ABC Codes can store a list of literal values to be represented by a base enumeration. ABC Codes can be used as rating a system for a customer’s credit, for example.

Related Lesson: Create a Base Enumeration

Q: You should use extended data types whenever possible. TRUE OR FALSE.

A. True
B. False

Correct Option: A
Remarks:

Explanation:

Justification:

True: This statement is true. EDTs offer many benefits, such as reusability and easier code navigation and reduce overall work. They should be used whenever possible.

Related Lesson: Best Practices

Q: You are to complete the code needed to create methods in a class with inheritance. You would like your method accessible to any class in the system. Which will best complete this statement?


____ void getFromDialog()
    {
  ~~~Body of code ~~~
        super();
    }

A. public
B. private
C. protected
D. void

Correct Option: A
Remarks:

Explanation:

Justification:

The public keyword is used to make the given method accessible from any other class in the system.
The private keyword only allows access from within the scope of the given method. This prevents accidental or unintentional re-use.
The protected keyword allows access to any subclasses that may extend the class that the method resides in. However, it prevents access from all other outside object calls.
The void keyword is already explicitly stated in the code snippet, and should not be used twice. This indicates that the given method does not return a value. The void keyword is used in conjunction with the scoping keywords: private, public and protected.

Related Lesson: Best Practices

Q: What is the reserved word in a function that is used when the method does NOT return a value?

A. Static
B. Null
C. Void
D. Private

Correct Option: C
Remarks:

Explanation:

Justification:

A static method is a method that does not require object instantiation, but this does not determine whether or not a value will be returned.
A method of type null is not a valid method in Dynamics AX.
Void is the keyword used to specify that nothing should be returned from this method.
The Private keyword determines the scope or accessibility of a method’s variables and does not determine what, if anything should be returned.

Related Lesson: Methods

Q: Using the “Private” keyword for methods allows access to variables within those methods from within the current class or subclasses. TRUE or FALSE.

A. True
B. False

Correct Option: B
Remarks:

Explanation:

Justification:

False: This statement is false. The Private keyword only allows access to variables within the scope of the current class. Subclasses cannot access these variables. The “Protected” keyword should be used to provide access to subclasses as well.

Related Lesson: Best Practices

Q: How are base enums represented and stored in the database?

A. A literal string value
B. A numerical value
C. An alphabetical character
D. A series of numerical and alphabetical characters

Correct Option: B
Remarks:

Explanation:

Justification:

A. Incorrect: Users see the literal string value in the user interface, but the literal value isn’t stored in the database.
B. Correct: Base enums are stored as numeric values (for example, 0, 1, 2) in the database.
C. Incorrect: Numerical values, not alphabetical characters, are used when storing base enums in the database.
D. Incorrect: Only numerical values are stored in the database.

Q: What does the following X++ code snippet achieve?


void new(real _x = 10, real _y = 10)
{
    x = _x;
    y = _y;
}

A. It defines a method called "new" that initializes variables x and y to default values of 10 each.
B. It creates a constructor named "new" with parameters _x and _y, and initializes variables x and y with the provided values.
C. It defines a default constructor that initializes variables x and y to the values of _x and _y.
D. It declares a class with default values of 10 for variables x and y, which can be accessed using the "new" method.

Correct Option: B
Remarks:

Explanation:

It creates a constructor named "new" with parameters _x and _y, and initializes variables x and y with the provided values.
Explanation: In X++, the code defines a constructor named "new" with optional parameters _x and _y. This constructor is used to initialize the values of the variables x and y when an object of the class is created. If no values are provided, the default values of 10 are used.

Q: When does your code become available locally in finance and operations apps?

A. When you save it
B. When you shelve your changes
C. When you check in your changes to source control.
D. When you build it.

Correct Option: D
Remarks:

Explanation:

Justification:

A. Incorrect: Saving doesn't affect the metadata.
B. Incorrect: Shelving your changes doesn't create metadata for those changes.
C. Incorrect: Checking in changes to source control doesn't affect the metadata.
D. Correct: Building is what creates the metadata to reflect your code, and the metadata is what finance and operations apps uses to define its behaviors.

Q: Which of the following is true about base enum elements in X++?

A. Elements must have numeric values
B. Elements cannot have associated labels
C. Elements are implicitly assigned sequential integers
D. Elements are exclusively used for exception handling

Correct Option: C
Remarks:

Explanation:

Base enum elements in X++ are implicitly assigned sequential integers, starting from 0 by default. However, you can explicitly assign integer values to enum elements if needed. This feature ensures that each enum element corresponds to a unique numeric value, making it easier to work with these elements in your code.

Q: Identify valid class name from below

A. <pre class = "prettyprint"><xmp>internal final class +MyClassName{ }</xmp></pre>
B. <pre class = "prettyprint"><xmp>internal final class MyClassName{ }</xmp></pre>
C. <pre class = "prettyprint"><xmp>internal final class 1MyClassName{ }</xmp></pre>
D. <pre class = "prettyprint"><xmp>internal final class MyClassName{ }</xmp></pre>

Correct Option: D
Remarks:

Explanation:


internal final class MyClassName{  }

Develop and test code - Quiz

3. Which of the following is examples of field types where a base enumeration shouldn't be used? Odd one out.

You should use extended data types whenever possible. TRUE OR FALSE.

You are to complete the code needed to create methods in a class with inheritance. You would like your method accessible to any class in the system. Which will best complete this statement? ____ void getFromDialog() { ~~~Body of code ~~~ super(); }

What is the reserved word in a function that is used when the method does NOT return a value?

Using the “Private” keyword for methods allows access to variables within those methods from within the current class or subclasses. TRUE or FALSE.

How are base enums represented and stored in the database?

What does the following X++ code snippet achieve? void new(real _x = 10, real _y = 10) { x = _x; y = _y; }

When does your code become available locally in finance and operations apps?

Which of the following is true about base enum elements in X++?

Identify valid class name from below

You are to complete the code needed to create methods in a class with inheritance. You would like your method accessible to any class in the system. Which will best complete this statement?

What does the following X++ code snippet achieve?