What is the use of ‘using’ declaration.

C++ Interview Questions and Answers

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6. What is the use of ‘using’ declaration.

A using declaration makes it possible to use a name from a namespace without the scope operator.

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Other Interview Questions

• What is C++?
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• What is an accessor?
• Differentiate between a template class and class template.
• When does a name clash occur?
• Define namespace.
• What is the use of ‘using’ declaration.
• What is an Iterator class?
• What is an incomplete type?
• What is a dangling pointer?
• Differentiate between the message and method.
• What is an adaptor class or Wrapper class?
• What is a Null object?
• What is class invariant?
• What do you mean by Stack unwinding?
• Define precondition and post-condition to a member function.
• What are the conditions that have to be met for a condition to be an invariant of the class?
• What are proxy objects?
• Name some pure object oriented languages.
• What is a node class?
• What is an orthogonal base class?
• What is a container class? What are the types of container classes?
• How do you write a function that can reverse a linked-list?
• What is polymorphism?
• How do you find out if a linked-list has an end? (i.e. the list is not a cycle)
• How can you tell what shell you are running on UNIX system?
• What is Boyce Codd Normal form?
• What is pure virtual function?
• Write a Struct Time where integer m, h, s are its members
• How do you traverse a Btree in Backward in-order?
• What is the two main roles of Operating System?
• In the derived class, which data member of the base class are visible?
• How do you find out if a linked-list has an end? (i.e. the list is not a cycle)
• What is the difference between realloc() and free()?
• What is function overloading and operator overloading?
• What is the difference between declaration and definition?
• What are the advantages of inheritance?
• How do you write a function that can reverse a linked-list?
• What do you mean by inline function?
• Write a program that ask for user input from 5 to 9 then calculate the average
• Write a short code using C++ to print out all odd number from 1 to 100 using a for loop
• What is public, protected, private?
• Write a function that swaps the values of two integers, using int* as the argument type.
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• What is polymorphism?
• What is virtual constructors/destructors?
• What is the difference between an ARRAY and a LIST?
• Does c++ support multilevel and multiple inheritance?
• What is a template?
• Define a constructor - What it is and how it might be called (2 methods).
• You have two pairs: new() and delete() and another pair : alloc() and free(). Explain differences between eg. new() and malloc()
• What is the difference between class and structure?
• What is RTTI?
• What is encapsulation?
• Explain term POLIMORPHISM and give an example using eg. SHAPE object: If I have a base class SHAPE, how would I define DRAW methods for two objects CIRCLE and SQUARE
• What is an object?
• How can you tell what shell you are running on UNIX system?
• Describe PRIVATE, PROTECTED and PUBLIC – the differences and give examples.
• What is namespace?
• What do you mean by inheritance?
• What is a COPY CONSTRUCTOR and when is it called?
• What is Boyce Codd Normal form?
• What is virtual class and friend class?
• What is the word you will use when defining a function in base class to allow this function to be a polimorphic function?
• What do you mean by binding of data and functions?
• What are 2 ways of exporting a function from a DLL?
• What is the difference between an object and a class?
• Suppose that data is an array of 1000 integers. Write a single function call that will sort the 100 elements data [222] through data [321].
• What is a class?
• What is friend function?
• Which recursive sorting technique always makes recursive calls to sort subarrays that are about half size of the original array?
• What is abstraction?
• What are virtual functions?
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• What is a scope resolution operator?
• What do you mean by pure virtual functions?
• What is polymorphism? Explain with an example?
• How can you quickly find the number of elements stored in a a) static array b) dynamic array ? Why is it difficult to store linked list in an array? How can you find the nodes with repetetive data in a linked list?
• What’s the output of the following program? Why?
• Why are arrays usually processed with for loop?
• What is an HTML tag?
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• What problems might the following macro bring to the application?
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• Anything wrong with this code? T *p = 0; delete p;
• How do you decide which integer type to use?
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• What does extern mean in a function declaration?
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• What is the difference between char a[] = “string”; and char *p = “string”;?
• What’s the auto keyword good for?
• What is the difference between char a[] = “string”; and char *p = “string”; ?
• How do I declare an array of N pointers to functions returning pointers to functions returning pointers to characters?
• What does extern mean in a function declaration?
• How do I initialize a pointer to a function?
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• Explain the scope resolution operator.
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• I write a program in C++ that asks the user for names of students and their cooresponding midterm scores ...
• How does throwing and catching exceptions differ from using setjmp and longjmp?
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• What is a conversion constructor?
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• What is a mutable member?
• What is an explicit constructor?
• What is the Standard Template Library (STL)?
• Describe run-time type identification.
• What problem does the namespace feature solve?
• Are there any new intrinsic (built-in) data types?
• Will the following program execute?
• Will it execute or not?
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• What methods can be overridden in Java?
• What are the defining traits of an object-oriented language?
• Write a program that ask for user input from 5 to 9 then calculate the average
• Can you be bale to identify between Straight- through and Cross- over cable wiring? and in what case do you use Straight- through and Cross-over?
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• Assignment Operator - What is the diffrence between a "assignment operator" and a "copy constructor"?
• "mutable" Keyword - What is "mutable"?
• RTTI - What is RTTI?
• STL Containers - What are the types of STL containers?
• Virtual Destructor - What is the need for “Virtual Destructor”?
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• What is output equal to in Bitwise Operations - ...