Chapter 12: Problem 10
b. ! c. ~ d. \( # Which of the following characters appears before a destructor’s name? a. # b. ! c. ~ d. \)
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Consider the following definition of the class myClass: class myClass { public: void setX(int a); //Function to set the value of x. //Postcondition: x = a; void printX() const; //Function to output x. static void printCount(); //Function to output count. static void incrementCount(); //Function to increment count. //Postcondition: count++; myClass(int a = 0); //constructor with default parameters //Postcondition x = a; //If no value is specified for a, x = 0; private: int x; static int count; }; a. Write a C++ statement that initializes the member variable count to 0. b. Write a C++ statement that increments the value of count by 1. c. Write a C++ statement that outputs the value of count. d. Write the definitions of the functions of the class myClass as described in its definition. e. Write a C++ statement that declares myObject1 to be a myClass object and initializes its member variable x to 5. f. Write a C++ statement that declares myObject2 to be a myClass object and initializes its member variable x to 7. g. Which of the following statements are valid? (Assume that myObject1 and myObject2 are as declared in Parts e and f.) myObject1.printCount(); //Line 1 myObject1.printX(); //Line 2 myClass.printCount(); //Line 3 myClass.printX(); //Line 4 myClass::count++; //Line 5 h. Assume that myObject1 and myObject2 are as declared in Parts e and f. What is the output of the following C++ code? myObject1.printX(); cout << endl; myObject1.incrementCount(); 1 2 Exercises | 717 myClass::incrementCount(); myObject1.printCount(); cout << endl; myObject2.printCount(); cout << endl; myObject2.printX(); cout << endl; myObject1.setX(14); myObject1.incrementCount(); myObject1.printX(); cout << endl; myObject1.printCount(); cout << endl; myObject2.printCount(); cout << endl;
Explain why you would need both public and private members in a class.
Consider the definition of the following class: class CC { public : CC(); //Line 1 CC(int); //Line 2 CC(int, int); //Line 3 CC(double, int); //Line 4 . . . private: int u; double v; }; a. Give the line number containing the constructor that is executed in each of the following declarations. i. CC one; ii. CC two(5, 6); iii. CC three(3.5, 8); b. Write the definition of the constructor in Line 1 so that the private member variables are initialized to 0. c. Write the definition of the constructor in Line 2 so that the private member variable u is initialized according to the value of the parameter, and the private member variable v is initialized to 0. d. Write the definition of the constructors in Lines 3 and 4 so that the private member variables are initialized according to the values of the parameters.
Find the syntax errors in the definitions of the following classes. a. class AA { public: void print()const; int sum(); AA(); int AA(int, int); private: int x; int y; }; b. class BB { int one; int two; public: bool equal() const; print(); BB(int, int); } c. class CC { public; void set(int, int); void print()const; CC(); CC(int, int); bool CC(int, int); private: int u; int v; };
Mark the following statements as true or false. a. The member variables of a class must be of the same type. b. The member functions of a class must be public. c. A class can have more than one constructor. d. A class can have more than one destructor. e. Both constructors and destructors can have parameters.
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