Answer / sudha

A copy constructor is a special constructor in the C++
programming language used to create a new object as a copy
of an existing object.

There are 3 important places where a copy constructor is
called.

When an object is created from another object of the same
type
When an object is passed by value as a parameter to a
function
When an object is returned from a function


class B //With copy constructor
{
private:
char *name;
public:
B()
{
name = new char[20];
}
~B()
{
delete name[];
}
//Copy constructor
B(const B &b)
{
name = new char[20];
strcpy(name, b.name);
}
};

Answer / madhu

Basic thing, copy constructor will be called whenever a copy
is made. and copy constructors are called when:
1. create a new object using existing object.
2. When is returning to caller.
3. When an object is passed by value as a parameter to a
function

Basically a default copy constructor will be created which
does bitwise copy also know as shallow copy.
This will become a problem when we are dealing with dynamic
memory allocation for variables and leads to dangling pointer.
To overcome we have to override by deep copy.

Answer / achal ubbott

e.g. Let there be a class

class Sample
{

};
suppose in main() you do like here

Sample obj1;
Sample obj2 = obj1; // Copy cons called here.
// then you call a function like this

fun(obj1); //Copy cons called here.

How can you overcome the diamond problem in inheritance?

0 Answers   NIIT,

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Is this job good for future? can do this job post grduate student?

0 Answers  

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what is a virtual class?

5 Answers   Cap Gemini, IBM, Infosys, Trinity Technologies,

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What is debug class?what is trace class? What differences are between them? With examples.

0 Answers  

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#include <stdio.h> #include <alloc.h> #include <stdlib.h> #include <conio.h> 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.

0 Answers  

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Get me a number puzzle game-program

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What is the difference between pass by value,pass by pointer,pass by reference in the catch block in the exception handling in c++

1 Answers   TCS,

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Write pseudo code for push in a stack?

2 Answers   emc2,

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Out of 4 concepts, which 3 C++ Follow?

1 Answers   TCS,

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Why is polymorphism needed?

0 Answers  

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what do you mean by static member variable?

2 Answers  

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The IT giant Tirnop has recently crossed a head count of 150000 and earnings of $7 billion. As one of the forerunners in the technology front, Tirnop continues to lead the way in products and services in India. At Tirnop, all programmers are equal in every respect. They receive identical salaries and also write code at the same rate. Suppose 14 such programmers take 14 minutes to write 14 lines of code in total. How long will in take 5 programmers to write 5 lines of code in total ?

6 Answers   TCS,

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