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Question
Q4: To implicitly overload the += operator:a. Only the + operator needs to be overloaded.
b. Only the = operator needs to be overloaded.
c. Both the + and = operators need to be overloaded.
Answer
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Related questions
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d. To deal with errors for components that will be widely used in other applications, such as classes and libraries.
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Q1: What will be output by the following statements?double x = .0012345;cout << fixed << x << endl;cout << scientific << x << endl;a. 1.234500e-0030.001235b. 1.23450e-0030.00123450c. .0012351.234500e-003d. 0.001234501.23450e-003
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Q1: When the showbase flag is set:
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Q1: Which of the following is not a member function of the C++ ostream class?
a. Stream-insertion operator (<<).
b. Stream-extraction operator (>>).
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d. write.
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a. cout
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c. cin
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Q1: Which C++ data type was designed to store Unicode characters?
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b. long
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Q1: Select the correct statement regarding C++ I/O streams:
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Q4: Abstract classes do not necessarily have:
a. A 0 pointer in their vtable.
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Q2: Concrete classes that inherit virtual functions but do not override their implementations:
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Q1: The line:
virtual double earnings() const = 0;
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a. All classes that directly inherit from this class will override this method.
b. This class is an abstract class.
c. Any concrete class derived from this class will have an earnings function.
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Q4[C++11]: Which of the following statements is true?a. In C++11, all classes can be used as base classes.b. In C++11, only classes that are not declared as final can be used as base classes.c. In C++11, only classes that are declared as base can be used as base classes.d. None of the above
Q:
Q2: Which of the following is true about using inheritance in software engineering?
a. Common attributes and behaviors should be factored out of closely related classes and placed into a base class from which the original classes can now inherit.
b. It is best to create a huge class library to make it easy for a client to find the most appropriate class for his or her needs.
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Q3[C++11]: Which of the following statements about inheriting base class constructors is false?
a. To inherit a base class's constructors, you write the following line of code in the derived class definition (BaseClass is the base class's name):
using BaseClass::BaseClass;
b. If an inherited base-class constructor has default arguments, the line of code in Part (a) causes the compiler to generate a derived-class constructor with the same default arguments.
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Q2: Which of the following is not a kind of inheritance in C++?a. public.b. private.c. static.d. protected.
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Q3: Assume that the function call operator() is overloaded for data type String in the usual sense of selecting a substring from a larger string. For a String object string1 with the character string "ABCDEFGHI", what string does string1( 4 , 2 ) return?
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Q:
Q2: The array subscript operator [], when overloaded, cannot:
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Q2: The delete [] operator:
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Q1: Suppose you have a programmer-defined data type Data and want to overload the << operator to output your data type to the screen in the form cout << dataToPrint; and allow cascaded function calls. The first line of the function definition would be:
a. ostream &operator<<( ostream &output, const Data &dataToPrint )
b. ostream operator<<( ostream &output, const Data &dataToPrint )
c. ostream &operator<<( const Data &dataToPrint, ostream &output )
d. ostream operator<<( const Data &dataToPrint, ostream &output )
Q:
Q4: y and z are user-defined objects and the += operator is an overloaded member function. The operator is overloaded such that y += z adds z and y, then stores the result in y. Which of the following expressions is always equivalent to y += z?a. y = y operator+= zb. y.operator+=(z)c. y = y + zd. y operator+=(y + z)
Q:
Q3: An overloaded + operator takes a class object and a double as operands. For it to be commutative (i.e., a + b and b + a both work):a. operator+ must be a member function of the class from which the objects are instantiated.b. operator+ must be a non-member function.c. It must be overloaded twice; the operator+ function that takes the object as the left operand must be a member function, and the other operator+ function must be a global function.d. The + operator cannot be overloaded to be commutative.
Q:
Q1: Which of the following is false?
a. A string can be defined to store any data type.
b. Class string provides bounds checking in its member function at.
c. Class string's overloaded [] operator returns a vector element as an rvalue or an lvalue, depending on the context.
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Q:
Q3: Assume that t is an object of class Test, which has member functions a(), b(), c() and d(). If the functions a(), b() and c() all return references to an object of class Test (using the dereferenced this pointer) and function d() returns void, which of the following statements will not produce a syntax error:
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b. a().b().t;
c. t.d().c();
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Q:
Q2: Which of the following statements about friend functions and friend classes is false?a. A class can either grant friendship to or take friendship from another class using the friend keyword.b. A friend declaration can appear anywhere in a class definition.c. A friend of a class can access all of its private data member and member functions.d. The friendship relationship is neither symmetric nor transitive.
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Q2: A client changing the values of private data members is:
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d. Only possible if the private variables are not declared inside the class.
Q:
Q2: Which of the following is not true of a destructor?
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b. It is called before the system reclaims the object's memory.
c. If the programmer does not explicitly provide a destructor, the compiler creates an "empty" destructor.
d. It releases the object's memory.
Q:
Q2: Utility functions:
a. Are private member functions that support operations of the class's other member functions.
b. Are part of a class's interface.
c. Are intended to be used by clients of a class.
d. Are a type of constructor.
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Q1: A function template can be overloaded by:
a. Using other function templates with the same function name and parameters.
b. Using non-template functions with the same name and different parameters.
c. Using non-template functions with a different name but the same parameters.
d. Using other function templates with a different name but the same parameters.
Q:
Q1: Which of the following is true?a. Only class templates may specify default type arguments for type parameters.b. Only function templates may specify default type arguments for type parameters.c. Both class templates and function templates may specify default type arguments for type parameters.d. None of the above.
Q:
Q1: Nontype parameters are:
a. Unable to have default arguments.
b. Specified before the angle-bracket-enclosed type-parameter list.
c. Constants.
d. Required for class templates.
Q:
Q3: Function templates:
a. Can include objects of template classes as parameters.
b. Must have return type T.
c. Do not need a separate template< typename type >statement if they take objects from a template class as a parameter.
d. Do not need a separate template< typename type >statement.