Exam 8: Operator Overloading,friends,and References

Consider this operator overloading for class Money,modified from Display 8.1 by omitting the const modifier on the return type: Money operator+(const Money& amt1,const Money& amt2); Is the following expression legal? If legal,what could it mean,and where does the information that is assigned go? Money m1(17.99),m2(23.57)m3(15,22); (m1 + m2)= m3;

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Question 1

Correct Answer:

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True

Which operators can be overloaded only as non-static class members?

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Question 2

Correct Answer:

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= [] -> and ().

What do you need to add to the class definition to overload operator < so that it applies to the type Money from Display 8.1? Given this extract from the class Money from Display 8.1 of the text. class Money { $\quad$ public: $\quad$ $\quad$ Money( ); $\quad$ $\quad$ // other constructors $\quad$ $\quad$ // other public members $\quad$ $\quad$ int getCents( )const; $\quad$ $\quad$ int getDollars( )const; $\quad$ private: $\quad$ $\quad$ int dollars; $\quad$ $\quad$ int cents; $\quad$ $\quad$ // other private members };

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Question 3

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For non-member,non-friend operator overloading.add the following declaration and definition as appropriate file.The syntax here is for a definition outside the class.
bool operator < (const Money& amt1,const Money& amt2);
bool operator < (const Money& amt1,const Money& amt2)
{
$\quad$ int dollars1 = amt1.getDollars( );
$\quad$ int dollars2 = amt2.getDollars( );
$\quad$ int cents1 = amt1.getCents( );
$\quad$ int cents2 = amt2.getCents( );
$\quad$ return ((dollars1 < dollars2)||
$\quad$ ((dollars1==dollars2)&&(cents1<NOT<cents2)));
}

If I need to build an object for return from a function,I can construct that function directly in the return statement.

(True/False)

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Question 4

Consider the class definition: class IntPair { int first; int second; public: IntPair(int firstValue,int secondValue); // prefix operator++ here // postfix operator ++ here int getFirst( )const; int getSecond( )const; }; a)Give declarations for prefix and postfix versions of operator++ b)Give definitions for prefix and postfix versions of operator++

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Question 5

When overloading an operator,you cannot change the number of arguments an operator takes.

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Question 6

When overloading an operator,you can create a new operator different from the more usual operators.

(True/False)

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Question 7

Overloading a binary operator as a stand-alone function requires two arguments.

(True/False)

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Question 8

C++ allows overloading of the function application operator ( ).Explain.

(True/False)

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Question 9

Given the class definition: class A { public: //constructors // other members private: int x; int y; }; Give declarations of operator functions for each of the following ways to overload operator + You must state where the declaration goes,whether within the class in the public or private section or outside the class.The operator + may be overloaded a)as friend function b)as member function c)as non-friend,non-member function

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Question 10

What are some reasons for using friend operator overloading?

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Question 11

The operator prefix operator ++ is an l-value,and the text asserts that we should emulate this with operator overloads by returning a reference from prefix versions of operator++.

(True/False)

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Question 12

It is impossible to get short-circuit behavior for overloaded operator && or operator ||

(True/False)

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Question 13

If a unary operator is overloaded as a stand-alone function,the argument may be any type.

(True/False)

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Question 14

When overloading an operator,you can change the behavior of the operator,making + do things that feel like multiplication,but this is unwise.

(True/False)

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Question 15

Explain the similarities and differences between (binary)operators such as +,*,-,/ and a function.

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Question 16

A friend function has access only to the private members and member functions of the class (and all objects of that class)of which it is a friend.

(True/False)

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Question 17

One can guarantee left to right evaluation of the arguments to a comma expression overloading.

(True/False)

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Question 18

Which operators cannot be overloaded?

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Question 19

An overloaded operator= function must be a non-static class member.

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Question 20

Showing 1 - 20 of 31

Which operators can be overloaded only as non-static class members?

If I need to build an object for return from a function,I can construct that function directly in the return statement.

When overloading an operator,you cannot change the number of arguments an operator takes.

When overloading an operator,you can create a new operator different from the more usual operators.

Overloading a binary operator as a stand-alone function requires two arguments.

C++ allows overloading of the function application operator ( ).Explain.

What are some reasons for using friend operator overloading?

The operator prefix operator ++ is an l-value,and the text asserts that we should emulate this with operator overloads by returning a reference from prefix versions of operator++.

It is impossible to get short-circuit behavior for overloaded operator && or operator ||

If a unary operator is overloaded as a stand-alone function,the argument may be any type.

When overloading an operator,you can change the behavior of the operator,making + do things that feel like multiplication,but this is unwise.

Explain the similarities and differences between (binary)operators such as +,*,-,/ and a function.

A friend function has access only to the private members and member functions of the class (and all objects of that class)of which it is a friend.

One can guarantee left to right evaluation of the arguments to a comma expression overloading.

Which operators cannot be overloaded?

An overloaded operator= function must be a non-static class member.

C++ Basics

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Parameters and Overloading

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Strings

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Templates

Linked Data Structures

Exception Handling

Standard Template Library

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