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CPP225 Object Oriented Programming I - Value and Reference Types Quiz

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CPP225 Object Oriented Programming I - Value and Reference Types Quiz

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Questions and Answers

What is the main purpose of System.ValueType in C#?

To create and destroy data quickly

To ensure that the derived type is allocated on the heap

To ensure that the derived type is allocated on the stack (correct)

To monitor the lifetime of heap-allocated data

What is the main advantage of stack-allocated data in C#?

It can be created and destroyed quickly (correct)

It is monitored by the garbage collector

It allows for dynamic memory allocation

It has a lifetime determined by a large number of factors

What happens to a structure variable when it falls out of the defining scope in C#?

Its lifetime is determined by a large number of factors

It is removed from memory immediately (correct)

It is monitored by the.NET garbage collector

It is allocated on the heap

How are value types handled when assigned to each other in C#?

The field data is copied member by member Signup and view all the answers

What is the primary member to copy when assigning one simple data type such as System.Int32 to another in C#?

The numerical value Signup and view all the answers

What ensures that heap-allocated data has a lifetime determined by a large number of factors in C#?

.NET garbage collector Signup and view all the answers

What happens when the value of p1.X is changed in the Point example?

The value of p2.X remains unaffected Signup and view all the answers

In the PointRef example, why does changing the value of p3.X also affect p4.X?

Because p3 and p4 point to the same object on the heap Signup and view all the answers

What is the purpose of the ShapeInfo class?

To maintain an informational string for PointRef instances Signup and view all the answers

What will be the output when both p1 and p2 are displayed in the Point example?

X = 10, Y = 10 for both p1 and p2 Signup and view all the answers

Why does changing the value of p3.X also affect p4.X in the PointRef example?

p3 and p4 point to the same object on the heap Signup and view all the answers

What is the major difference between value types and reference types?

Value types store data on the stack, while reference types store data on the heap Signup and view all the answers

In which scenario are two copies of a type created on the stack?

When using a struct to create variables Signup and view all the answers

What happens when a reference type is assigned to another?

The reference variable points to what the other reference variable points to in memory Signup and view all the answers

When is a custom constructor used in C#?

To create new instances of classes or structures Signup and view all the answers

"Being a reference type" implies that:

"The type contains references to other types" Signup and view all the answers