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;
