Object Oriented Programming MCQs

Page No. 83

What is upcasting?


aCasting subtype to supertype

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bCasting super type to subtype

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cCasting subtype to super type and vice versa

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dCasting anytype to any other type

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Why is downcasting possible in any language?


aBecause inheritance follows has-a relationship

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bBecause inheritance follows is-a relationship

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cBecause inheritance doesn’t follow any relationship

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dBecause inheritance is not involved in casting

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When is the downcasting used?


aTo separate inherited class from base class

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bTo write a more complex code

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cTo compare two objects

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d To disable one class in inheritance

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What happens when downcasting is done but not explicitly defined in syntax?


a Compile time error

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bRuntime error

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cCode write time error

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dConversion error

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View Answer Compile time error

Which way the downcasting is possible with respect to inheritance?


aUpward the inheritance order

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bDownward the inheritance order

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cDownward the inheritance order

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dOrder of inheritance doesn’t matter

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Java supports direct downcasting


aTrue

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bFalse

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cA & B

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d None of the above

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View Answer False

How to prevent the ClassCastExceptions?


aBy using instanceof

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bBy using is-a check

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cBy using arrow operator with check function

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dBy checking type of conversion

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View Answer By using instanceof

Which is the exception handler for the exceptions of downcasting?


aCastException

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bClassCastingExeption

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cClassCasting

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dClassCastException

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View Answer ClassCastException

Which is the proper syntax of dynamic_cast?


adynamic_cast(object)

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bdynamic_cast new (object)

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cdynamic_cast(object)

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ddynamic_cast(object)

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View Answer dynamic_cast(object)

If dynamic_cast fails, which value is returned?


a void

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bnull

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cvoid pointer

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dnull pointer

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View Answer null pointer

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