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SAP Exam C_ABAPD_2309 Topic 3 Question 32 Discussion

Actual exam question for SAP's C_ABAPD_2309 exam
Question #: 32
Topic #: 3
[All C_ABAPD_2309 Questions]

Refer to the exhibit.

with which predicate condition can you ensure that the CAST will work?

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Suggested Answer: C

The predicate condition that can be used to ensure that the CAST will work is IS INSTANCE OF. The IS INSTANCE OF predicate condition checks whether the operand is an instance of the specified class or interface. This is useful when you want to perform a downcast, which is a conversion from a more general type to a more specific type. A downcast can fail if the operand is not an instance of the target type, and this can cause a runtime error.Therefore, you can use the IS INSTANCE OF predicate condition to check whether the downcast is possible before using the CAST operator12. For example:

The following code snippet uses the IS INSTANCE OF predicate condition to check whether the variable g_super is an instance of the class lcl_super. If it is, the CAST will work and the variable g_sub1 will be assigned the value of g_super.

DATA: g_super TYPE REF TO lcl_super, g_sub1 TYPE REF TO lcl_sub1. IF g_super IS INSTANCE OF lcl_super. g_sub1 = CAST #( g_super ). g_sub1->method( ... ). ENDIF.

You cannot do any of the following:

IS SUPPLIED: The IS SUPPLIED predicate condition checks whether an optional parameter of a method or a function module has been supplied by the caller. This is useful when you want to handle different cases depending on whether the parameter has a value or not.However, this predicate condition has nothing to do with the CAST operator or the type of the operand12.

IS NOT INITIAL: The IS NOT INITIAL predicate condition checks whether the operand has a non-initial value. This is useful when you want to check whether the operand has been assigned a value or not.However, this predicate condition does not guarantee that the CAST will work, because the operand may have a value but not be an instance of the target type12.

IS BOUND: The IS BOUND predicate condition checks whether the operand is a bound reference variable. This is useful when you want to check whether the operand points to an existing object or not.However, this predicate condition does not guarantee that the CAST will work, because the operand may point to an object but not be an instance of the target type12.


by Leslee at Nov 13, 2024, 01:06 AM

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Elena
3 days ago
D) IS BOUND seems like the way to go here. If the value is bound, then the CAST should work without any issues. Easy peasy!
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Kate
6 days ago
I'm not sure, but I think C) IS INSTANCE OF could also be a valid option.
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Tequila
11 days ago
Hmm, I'm not so sure about that. I'd go with C) IS INSTANCE OF. That seems like the most straightforward way to check the data type before casting it.
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Yolando
5 days ago
I think C) IS INSTANCE OF is the correct option.
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Annelle
14 days ago
I agree with Lonna, because if the variable is not initial, then the CAST will work.
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Kimbery
20 days ago
I think the answer is B) IS NOT INITIAL. The CAST operation requires that the input value is not initial, so this predicate condition would ensure that the CAST works properly.
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Anabel
4 days ago
I believe D) IS BOUND could also be a valid option. It checks if the input value is bound to a specific object, which could be necessary for the CAST operation to work correctly.
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Donette
9 days ago
I think C) IS INSTANCE OF might also work in this case. It checks if the input value is an instance of a specific class, which could be useful for the CAST operation.
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Leatha
10 days ago
I agree, B) IS NOT INITIAL is the correct answer. It ensures that the input value is not initial before performing the CAST operation.
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Lonna
22 days ago
I think the answer is B) IS NOT INITIAL.
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