Answer:
Following are the code in the C++ Programming Language.
//define class and inherited the parent class
class WindowWithBorder : public Window
{
//access modifier
private:
//set integer variable
int borderWidth;
//set integer variable
int windowWidth;
//access modifier
public:
//definition of the constructor that accept an integer type argument
WindowWithBorder(int);
//definition of the function
int getUseableWidth();
};
//set constructor outside the class
WindowWithBorder::WindowWithBorder(int y)
{
//initialization in integer variable from function
windowWidth = getWidth();
//initialization in integer variable from the argument list
borderWidth = y;
}
//set function from outside the class
int WindowWithBorder::getUseableWidth()
{
//return output
return windowWidth - borderWidth;
}
Explanation:
Here we define a class "WindowWithBorder" which inherit their parent class "Window", inside the class.
- Set two integer data type private variables "borderWidth" and "windowWidth".
- Write the definition of the "windowWidth" class constructor that accept the integer type argument list.
- Write the definition of the function "getUseableWidth()" which is integer type.
Then, we define constructor outside the class which accept the integer type argument list "y" inside it.
- we initialize in the variable "windowWidth" from the function "getWidth()".
- Initialize in the variable "borderWidth" from the argument of the constructor.
Finally, we define function in which we perform the subtraction of the variable "windowWidth" from the variable "borderWidth" and return it.
