The first error is a typo you wrote pememory. The second error appears because you didn’t code any transformation between Float and ptrFloat. You should add a copy constructor to Float: Float(const Float& a) : Float(*a.fmem_top) {} And then a conversion constructor to ptrFloat: ptrFloat(Float a) : Float(a) { pmem_top=pmemory; *pmem_top=abc; pmem_top++; } PS: your … Read more
What is difference between using a colon (:) when creating a class to use inheritance and the ‘using’ keyword at the top of the program code? solved What is difference between using a colon (:) when creating a class to use inheritance and the ‘using’ keyword at the top of the program code?
When you pass a variable to a method it is copied. This means if you set that variable in the method it has no effect on the caller. i.e. it doesn’t initialise the callers copy of the variable. You need to change your code to look like this. shetatch = z1[i].shetach(length); The variable shetatch inside … Read more
Introduction A syntax error is an error in the syntax of a sequence of characters or tokens that is intended to be written in a particular programming language. In Java, a syntax error can occur when an extend keyword is used incorrectly. This article will discuss the causes of syntax errors with an extend in … Read more
Remove the getter and setter of your private campusName and rename your public campusName to CampusName. Add following code in your Campus class public override string ToString() { return CampusName() + “\n is located at ” + ShowAddress() + “\n it has ” + Departments(); } You should write a base School class public class … Read more
I’m not quite sure what you are trying to do with this. But I think this will clear up the things for you. public class Course{ private String course = “CS101”; } public class FinishedCourse extends Course{ public void displayCourse(){ System.out.println(super.course); //compilation error. //You cannot access private variables even if it is in direct parent … Read more
This is actually easy to test However Static Constructors (C# Programming Guide) A static constructor is used to initialize any static data, or to perform a particular action that needs to be performed once only. It is called automatically before the first instance is created or any static members are referenced. Static constructor is called … Read more
public class Main { int x=25; int y =25; //Go to next class second aMethod(){ Second s = new Second(); s.manipulateValues(x,y); } } public class Second { //inherit values of x and y //manipulate values //Go to next class third public void manipulateValues(int x, int y){ //manipulate here Third t = new Third (); s.manipulateHereToo(x,y); … Read more
(D) It does not compile 😉 The second catch block is unreachable. If you turn it around, and catch Y first you still should get a compiler warning, as Z is a checked exception and the compiler will detect that only the first catch clause can be reached. But the example will work, and “Error … Read more
you have to create a class contructor class CIRCLE : public SHAPE { public: CIRCLE() { name=”circle”; } void display() { cout<<name; } }; 2 solved How to set class member as constant? [closed]
Create default constructor in your base class. your sub class constructor implicitly calls default constructor of base class. if you want initialze your base class with sub class elements, you can call super(int, int) from sub class constructor. In above example you can use as below, sub(int y, int z) { super(y,z); c = y; … Read more
So, if this is just a thought-experiment, then the answer is “You can’t do that”. If you actually want a hierarchy where your derived classes have different types, you could do something like this: class Base { public: virtual void bar() = 0; }; class A: public Base { public: void bar() { … do … Read more
Let’s draw a sketch: Person Employee (Employee can be though as a subset of Person) Manager (Manager can be though as a subset of Employee) so every Manager is Employee, every Employee is Person. The sequence is transitive, and thus every Manager is Person. Now, let’s see Person alice = new Employee(); You’ve created an … Read more
vector is template container defined in the STL header <vector> and a part of namespace std . Simply put, it acts like an array whose size can be changed just by adding a new element to it. Just like you store objects of some datatype in an array (for eg. int, char, or any other … Read more
It seems that you want to change the database type, from: std::vector <Employee> *EmployeeDB; this is a pointer to a vector, holding Employee instances. This means that the vector contains copies of employees, probably not what you want. To: std::vector <Employee*> EmployeeDB; This is a vector instance, holding pointers to Employees. You also should take … Read more