Module 12: X++ Overview - Quiz

Justification:

1. A variable cannot change data type without explicitly changing or converting the data type with a code statement.
2. The VAR keyword allows a variable to be defined without explicitly specifying the type; the compiler will automatically determine the data type based on the mandatory initialization expression.
3. An array can be declared using a data type. For example, “int myArray[10]”, declares an array of type integer with up to 10 values.
4. A container is declared using the container keyword. For example, “container myContainer”. A container can store variables of mixed data types.

Related Lesson: Variable Declaration

Justification:

1. Info, Warning and Error are the three types of output supported by the info log.
2. Info and Error are correct. However, the box output is not based from the Info Log output, but from the Box output type.
3. Error is a correct choice. However, the box output is from the output type of Box, and the Dialog output is from the output type of Dialog button.
4. Info is a correct output type for the Info Log type. However, Dialog and Box outputs are of the Dialog button and Box output types, not the Info Log output type.

Related Lesson: Basic Syntax

Justification:

1. Variables can be declared at the beginning of a method. However, they may be declared elsewhere as well.
2. Variables may be declared at the beginning of a class declaration. However, they may be declared elsewhere as well.
3. Variables can be declared anywhere in the code for small scopes. In-line variable declaration means you can declare and define the variable in a block of code as you plan to use it.
4. Variables are not declared on forms themselves.

Related Lesson: Variable Declaration

Justification:

1. 1, 3, 5, 7, 9 is the correct output. We declare the counter variable of type int inside the For loop and initialize it’s value to 1. The second clause of the For loop tells it to continue looping as long as the condition is met that the counter variable is less than 10. The third clause specifies how the counter will increment or change each time the loop executes. In the block of code, we also decrement the counter by 1 using the syntax “counter- -“. Therefore, we observe the output, which prints at 1 and increases by 2 each time.
2. The output will not increase by 3 each time due to the counter variable being decremented by one inside the block of code, after it prints. The upper limit for the For loop is “9” since the condition is “<10”; therefore, the value of 10 would not print.
3. The first value must be 1, since that is what the counter is initialized to, and enters the loop with that value. We would not observe a value of 0 with this code.
4. The first value must be 1, since that is what the counter is initialized to, and enters the loop with that value. We would not observe a value of 0 with this code.

            Related Lesson: Basic Syntax

• A. Commenting code to communicate with other developers is considered a best practice to show others the purpose of code.
• B. Using a naming standard for an organization is considered a best practice.
• C. Limiting code comments to shorten text strings isn't a best practice because comments should be used liberally.
• D. Each element having a label assigned in the Properties window is a best practice because labels are necessary for the user interface.

• A. Correct: Azure DevOps Services is the cloud-based offering for source control.
• B. Incorrect: Azure DevOps Server is the on-premises offering for source control.
• C. Incorrect: Visual Studio Team Foundation Server is the former name of Azure DevOps Server. It does not offer cloud-based source control.

Justification:

• A. Incorrect: code:”while" will return all code that contains “while,” which is more than you require.
• B. Correct: code:”while" type:form,method will return form methods that use While select in the code.
• C. Incorrect: type:form,method while will try to return form methods with the name “while.”
• D. Incorrect: name:while will try to return any element with the name “while.”

• A. Incorrect: You do not want an overly complicated branching strategy because it will cause unnecessary work and planning.
• B. Incorrect: You do not want the branching strategy to be the same for every implementation; each implementation is unique.
• C. Correct: Keep the branching structure simple without over complicating it, making sure your strategy is easy to navigate and will produce the correct code flow for your implementation.

• A. Incorrect: The number of users is important for the environment sizing and licensing, and it can affect the performance of environments during the entire implementation. This is an important consideration.
• B. Incorrect: The number of transactions per month is important for environment sizing and can affect the entire implementation scale.
• C. Incorrect: Seasonality of your company is a large consideration when thinking about and planning for an implementation.
• D. Correct: Printing checks is a detail of the implementation, but it is not a business concept to be considered that would change anything large about an implementation.

• A. Incorrect: Error handling is not a conditional statement.
• B. Incorrect: A ternary operation only checks if a value or expression is true. Based on the results, the operation takes different actions.
• C. Incorrect: The if statement does not allow multiple branches of code depending on a value. If statements check if the expression is true or false and then runs or doesn’t run the code.
• D. Correct: The switch statement allows you to use cases. If the case matches the value of the switch expression, then a specific code block can run. A default case can also be used when no other cases match.