Below, suppose that you have the following classes: classA and classB. Write the class into a header that is called from main. Be sure to #include , using namespace std; and any additions such as #include "pch. h" are present. class classA
{
public:
virtual void print() const;
void doubleNum();
classA(int a = 0);
private:
int x;
};
void classA::print() const
{
cout << "ClassA x: " << x << endl;
}
void classA::doubleNum()
{
x = 2 * x;
}
classA::classA(int a)
{
x = a;
}
class classB: public classA
{
public:
void print() const;
void doubleNum();
classB(int a = 0, int b = 0);
private:
int y;
};
void classB::print() const
{
classA::print();
cout << "ClassB y: " << y << endl;
}
void classB::doubleNum()
{
classA::doubleNum();
y = 2 * y;
}
classB::classB(int a, int b) : classA(a)
{
y = b;
}
What is the output of the following function main?
int main()
{
classA *ptrA;
classA objectA(2);
classB objectB(3, 5);
ptrA = &objectA;
ptrA->doubleNum();
ptrA->print();
cout << endl;
ptrA = &objectB;
ptrA ->doubleNum();
ptrA->print();
cout << endl;
return 0;
}

What is a scenario where records stored in a computer frequently need to be checked

While inserting images, the picture command is usually used to insert photos from a digital camera, and the clip art command is usually used to a.edit the sizes and other characteristics of photos that have been inserted. b.take a screenshot of an image and copy it to the clipboard for pasting. c.search for drawings or other images from a library of prepared pictures. d.make illustrations using lines and shapes that are easy to manipulate.

Write a program that displays the following menu: geometry calculator 1. calculate the area of a circle 2. calculate the area of a rectangle 3. calculate the area of a triangle 4. quit enter your choice (1-4): if the user enters 1, the program should ask for the radius of the circle and then display its area. use the following formula: area = ď€(the square of r) use 3.14159 for ď€ and the radius of the circle for r. if the user enters 2, the program should ask for the length and width of the rectangle and then display the rectangle’s area. use the following formula: area = length * width if the user enters 3, the program should ask for the length of the triangle’s base and its height, and then display its area. use the following formula: area = base * height * .5 if the user enters 4, the program should end. input validation: display an error message if the user enters a number outside the range of 1 through 4 when selecting an item from the menu. do not accept negative values for the circle’s radius, the rectangle’s length or width, or the triangle’s base or height. note: if the user enters an improper menu choice (1-4), the program prints "the valid choices are 1 through 4. run the program again and select one of those." if the user enters a negative radius, the program prints "the radius can not be less than zero." if the user enters a negative value for height or base, the program prints "only enter positive values for base and height."