Answer Posted / pankajkolte

Virtual Destructor is used basically to ensure proper the
sequence of call to destructor.

class Employee {
virtual ~Employee() {}
};

class Manager : public Employee {
~Manager() {}
}

Employee * m = new Manager();//here was the mistake
delete m; // <-

In this case base class destructor if marked as virtual so
as derived class destructor will get called first then base
class destructor.

IS IT NECESSARY TO INITIALIZE VARIABLE? WHAT IF THE INSTANCE VARIABLE IS DECLARED final ? IS IT NECESSARY TO INITIALIZE THE final VARIABLE AT THE TIME OF THEIR DECLARATION?

2112

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What is abstraction encapsulation?

1201

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What are benefits of oop?

1196

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#include #include #include #include void insert(struct btreenode **, int); void inorder(struct btreenode *); struct btreenode { struct btreenode *leftchild; struct btreenode *rightchild; int data; }; main() { struct btreenode *bt; bt=(struct btreenode *)NULL; int req,i=1,num; clrscr(); printf("Enter number of nodes"); scanf("%d",&req); while(i<=req) { printf("Enter element"); scanf("%d",&num); insert(&bt,num); i++; } inorder(bt); } void insert(struct btreenode **sr, int num) { if(*sr==NULL) { *sr=(struct btreenode *)malloc (sizeof(struct btreenode)); (*sr)->leftchild=(struct btreenode *)NULL; (*sr)->rightchild=(struct btreenode *)NULL; (*sr)->data=num; return; } else { if(num < (*sr)->data) insert(&(*sr)->leftchild,num); else insert(&(*sr)->rightchild,num); } return; } void inorder(struct btreenode *sr) { if(sr!=(struct btreenode *)NULL) { inorder(sr->leftchild); printf("\n %d",sr->data); inorder(sr->rightchild); } else return; } please Modify the given program and add two methods for post order and pre order traversals.

3830

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Why multiple inheritance is not possible?

1122

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Can we create object of interface?

1176

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Describe these concepts: Polymorphism, Inheritance and Abstraction.

1247

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What is the example of polymorphism?

1212

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What is cohesion in oop?

1112

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Why can't we have instance(stack) of a class as a member of the same class like eg.Class A{A obj;} as we can have self refential pointer

2204

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What is inheritance in oop?

1092

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What is basic concept of oop?

1224

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Plese get me a perfect C++ program for railway/airway reservation with all details.

3957

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What is encapsulation in ict?

1120

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What is polymorphism oop?

1114

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