Answer Posted / arun

#include<iostream>
using namespace std;

class Singleton
{
public:
static Singleton* Instance();
private:
static Singleton* pinstance;
Singleton();
};

Singleton* Singleton::pinstance = 0;// initialize pointer
Singleton* Singleton::Instance ()
{
if (pinstance == 0) // is it the first call?
{
pinstance = new Singleton; // create sole instance
}
return pinstance; // address of sole instance
}
Singleton::Singleton()
{
//... perform necessary instance initializations
}

void main()
{
Singleton *p1 = Singleton::Instance();
cout<<p1<<endl;
Singleton *p2 = p1->Instance();
cout<<p2<<endl;
Singleton & ref = * Singleton::Instance();
}

which feature are not hold visual basic of oop?

2233

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What is protected in oop?

1114

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What is the full form of oops?

1240

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Why do we need oop?

1270

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officer say me - i am offered to a smoking , then what can you say

2157

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Can we create object of abstract class?

1146

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What is the problem with multiple inheritance?

1225

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How do you explain polymorphism?

1111

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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.

3819

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What polymorphism means?

1131

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What is destructor example?

1110

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write a C++ program for booking using constructor and destructor.

2583

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What is the difference between a mixin and inheritance?

1036

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Give two or more real cenario of virtual function and vertual object

2362

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Describe these concepts: Polymorphism, Inheritance and Abstraction.

1244

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