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10.9 10.10 10.11 10.12 10.13 10.14
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What name must a constructor have What name must a destructor have How many constructors can a class have How many destructors can a class have How and why is the scope resolution operator :: used in class definitions Which member functions are created automatically by the compiler if they are not included (by the programmer) in the class definition 10.15 How many times is the copy constructor called in the following code:
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Widget f(Widget u) { Widget v(u); Widget w = v; return w; } main() { Widget x; Widget y = f(f(x)); }
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10.16 Why are the parentheses needed in the expression (*p).data
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10.1 Implement a Point class for three-dimensional points (x,y,z). Include a default constructor, a copy constructor, a negate() function to transform the point into its negative, a norm() function to return the point s distance from the origin (0,0,0), and a print() function. Implement a Stack class for stacks of ints. Include a default constructor, a destructor, and the usual stack operations: push(), pop(), isEmpty(), and isFull(). Use an array implementation. Implement a Time class. Each object of this class will represent a specific time of day, storing the hours, minutes, and seconds as integers. Include a constructor, access functions, a function advance(int h, int m, int s) to advance the current time of an existing object, a function reset(int h, int m, int s) to reset the current time of an existing object, and a print() function. Implement a Random class for generating pseudo-random numbers. Implement a Person class. Each object of this class will represent a human being. Data members should include the person s name, year of birth, and year of death. Include a default constructor, a destructor, access functions, and a print function. Implement a String class. Each object of this class will represent a character string. Data members are the length of the string and the actual character string. In addition to constructors, destructor, access functions, and a print function, include a subscript function. Implement a Matrix class for 2-by-2 matrices:
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10.4 10.5
Include a default constructor, a copy constructor, an inverse() function that returns the inverse of the matrix, a det() function that returns the determinant of the matrix, a Boolean function isSingular() that returns 1 or 0 according to whether the determinant is zero, and a print() function.
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[CHAP. 10
Implement a Point class for two-dimensional points (x, y). Include a default constructor, a copy constructor, a negate() function to transform the point into its negative, a norm() function to return the point s distance from the origin (0,0), and a print() function. Implement a Circle class. Each object of this class will represent a circle, storing its radius and the x and y coordinates of its center as floats. Include a default constructor, access functions, an area() function, and a circumference() function.
Answers to Review Questions
10.1 10.2 10.3 A public member is accessible from outside the class; a private member is not. The class interface consists of the member data and the member function prototypes (i.e. just the function declarations). The class implementation contains the definitions of the member functions. A class member function is part of the class, so it has access to the class s private parts. An application function is declared outside the class, and so it does not have access to the class s private parts. A constructor is a class member function that executes automatically whenever an object of that class is instantiated (i.e., constructed). A destructor is a class member function that executes automatically whenever the scope of that object terminates (i.e., is destructed). The default constructor is the unique constructor that has no parameters (or the one whose parameters all have default values). A class s copy constructor executes whenever an object of that class is copied by any mechanism except direct assignment. This includes initialization, passing a parameter by value, and returning by value. An access function is a public class member function that returns the value of one of the class s data members. A utility function is a private class member function that is used only within the class to perform technical tasks. A class and a struct in C++ are essentially the same. The only significant difference is that the default access level for a class is private, while that for a struct is public. Every class constructor must have the same name as the class itself. Every class destructor must have the same name as the class itself, prefixed with a tilde (~). There is no limit to the number of constructors that a class may have. But since multiple constructors are function overloads, they all must be distinguishable by their parameter lists. A class can have only one destructor. The scope resolution operator :: is used in general to resolve external references. It is used in a class definition whenever the definition of a member function is given outside the scope of the class definition. There are four class member functions that are created automatically by the compiler if they are not included (by the programmer) in the class definition: the default constructor, the copy constructor, the destructor, and the overloaded assignment operator. The copy constructor is called 7 times in this code. Each call to the function f requires 3 calls to the copy constructor: when the parameter is passed by value to u, when v is initialized, and when w is returned by value. The seventh call is for the initialization y. The parentheses are needed in the expression (*p).data because the direct member selection operator . has higher precedence than the dereferencing operator * . (See Appendix C.)
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