why & sign is used in copy constructor

Answers were Sorted based on User's Feedback



why & sign is used in copy constructor..

Answer / sandip

To avoid local copy of object reference (&) is used in copy
constructor.
Moreover if the & is ommited then copy constructor goes in
infinite loop.
eg. if class name is Sample.

Copy constructor without &
Sample :: Sample (Sample s)
{
//Code goes here
}

and we create object as follows. ;
Sample s;
Sample s1(s);

In this scenario program will go in infinite loop.

Is This Answer Correct ?    9 Yes 1 No

why & sign is used in copy constructor..

Answer / neha

Here as address of the object is taken into consideration
thats why here & sign is used

Is This Answer Correct ?    7 Yes 3 No

why & sign is used in copy constructor..

Answer / krishnarao panchadi

Sandip, Good answer. It goes into Infinete loop because, as
the a local copy of the object is created, it will call the
constuctor one more time and another copy will be created
there and so on...

Is This Answer Correct ?    2 Yes 0 No

why & sign is used in copy constructor..

Answer / diraj kumar

it copy con command c baset of lan leval

Is This Answer Correct ?    0 Yes 2 No

Post New Answer

More STL Interview Questions

How do you convert stl to steps?

0 Answers  


Here are the questions and paper pattern from a Birlasoft previous placement paper held at Kolkata, West Bengal. There are two sections 1. Technical questions - 20 2. Aptitude questions - 25 Birlasoft Technical Multiple Choice Questions: Largest integer can be written from 8 bits is a. 256 b. 255 c. 8 d. 10 Change a hexadecimal no to octal How many address lines needed to pass 1MB of data. What is the function of the modulus operator in most language. a) Sets a system environmental value to either base 10 ,base 8 or base 16 b) Returns the remainder after dividing one number by another c) Returns the first argument raised to the second argument power d) Prints out the actual code written to standard output rather than executing the code class professor{} class teacher: public virtual professor{}; class researcher: public virtual professor {} class myprofessor :public teacher,public researcher {}; Referring to the sample code above ,if an object of class myprofessor were created ,how many instances of professor will it contain? a) 0 b) 1 c) 2 d) 3 Modern RDBMS s perfom the following the following functionc except _______. a) Force column values in one table to match any of the values in a column of another table b) Automatically replicate data on another server c) Automatically create new indexes based on query history d) Prevent unauthorized users from accessing data at the firls level RDBMS triggers are typically bound to a _________and one or more a) Table,SQL statement types b) SQL statement type,user c) Column,rows d) User, table What relationship is resolved by an intersecting or associative entity ? a) Recursive b) Mandatory one to one c) Many to Many d) One to One Make a copy of file upper in the directory two levels up . a) jump -2 upper b) cp upper ../..(answer) c) cp upper -2/ d) None of the above i = 0; j = 0; for(j=1;j<10;j++) i=i+1; In the (generic) code segment above what will be the value of the variable i at completion ? a) 0 b) 1 c) 3 d) 9 e) 10 Which of the following statements is true when a derivation inherits both a virtual and non-virtual instance of a base class ? a) Each derived class object has base objects only from the non virtual instance b) Each base class object has derived objects only from the non-virtual instance c) Each derived class object has base objects only from the virtual instance d) Each derived class object has a base object from the virtual instance and a base object from non-virtual instance. class Word { public: Word(const char*,int = 0); }; Referring to the sample code above what is the minimum number of arguments required to call the constructor ? a) 0 b) 1 c) 2 d) 3 What is the function of the modulus operator in most languages ? a) Sets a system environmental value to either base 10 ,base 8 or base 16 b) Returns the remainder after dividing one number by another c) Returns the first argument raised to the second argument power d) Prints out the actual code written to standard output rather than executing the code lass professor{} class teacher: public virtual professor{}; class researcher: public virtual professor {} class myprofessor :public teacher,public researcher {}; Referring to the sample code above ,if an object of class ? myprofessor? were created ,how many instances of professor will it contain? a) 0 b) 1 c) 2 d) 3 Modern RDBMS?s perfom the following the following functionc except a) Force column values in one table to match any of the values in a column of another table b) Automatically replicate data on another server c) Automatically create new indexes based on query history d) Prevent unauthorized users from accessing data at the firls level Which is not the characteristics of a view ? a) Consumes Disk space for data b) Multiple tables c) Multiple rows d) Updateable Technical Questions for computer science engineering students placement paper - cse branch tech / technical interview and written test paper questions from sql, rdbms, queries, c language, programming, etc. The questions are multiple choice / objective type. RDBMS triggers are typically bound to a ________and one or more ________ a) Table,SQL statement types b) SQL statement type,user c) Column,rows d) User, tables What relationship is resolved by an ?intersecting? or ? associative? entity ? a) Recursive b) Mandatory one to one c) Many to Many d) One to One Make a copy of file ?upper? in the directory two levels up . a) jump -2 upper b) cp upper ../.. c) cp upper -2/ d) None of the above Birlasoft Aptitude Section Questions: Question like A is engg. B is doctor C is artist etc then few condition related to them you have give answer to 4 or 5 qs on these conditions . same as above with different data and conditions. 3 qs onfinding error in english sentences If father is three times as old as son . 5 years ago he was 4 times age of his son what is son age. Same as above but now daughter and mother joined in and age in question is that of daughter. A figure is given find no of traingles in this figure Same as above but figure is diffrent and find no of squares and triangles. See other latest free online Birlasoft India placement exam test papers here with technical hr interview candidate real experiences from all over india - submitted by college freshers and company campus recruitment drives.

0 Answers   BirlaSoft,


#define CUBE(x) (x*x*x) main() { int a,b=3; a=cube(b++); printf("%d %d",a,b); } What should be the value of a and b? My calc a=4 but syst a=6 how pls tell me if you know it?

12 Answers   Wipro,


How stl is different from the c++ standard library?

0 Answers  


What are stl algorithms?

0 Answers  






write a program that will accept a number and print.its equivalent in words the maximum input number is 9999

0 Answers  


how to swap two numbers in a linked list without exchanging the data but only the links?

3 Answers   Wipro,


Give the output of the following program main() {char *p='a'; int *i=100/*p; } what will be the value of *i= 1

6 Answers   Sun Microsystems,


WHAT IS FIBONACCI SERIES?

4 Answers   Stewart,


What is the use of stl?

0 Answers  


Question 1)Read the data from one file and remove all the duplicated words and generate an output file containg only using words.Program should also print number of occurance of each words on standard output.(Program must be use STL and iostream object). Question 2)Write a program to convert the lower case contents of file to upper case using STL. Question 3)What is the output of this problem. int i=12; int &r =i; r+r/4; int +p =&r; int *p = &r; P+=r; return 1; Answer :a)12 b)17 c) 30 d)24 E)15 Question 4) #include #include #include void main() { char srcstr[30],desstr[30]; int i,len; clrscr(); cout<<"\nenter the string\n"; cin>>srcstr; len=strlen(srcstr); for(i=0;srcstr[i]!='\0';i++) { desstr[--len]=srcstr[i]; } desstr[i]='\0'; cout<<"\nreversed string is\n"; for(i=0;desstr[i]!='\0';i++) { cout< } getch(); } Answer : A) string output b)tuptuo gnirts c) string d)output Question 5) Class Test { static const Tk=LEN; int q; public: foo(intx =LEN):q(x){}; TGet Q() const { return q:} void call test Foo<long :9> foo(10); std::const<< foo.Getq(); Answer: 7,8,9,10,11 question 6) class A { int a; char b; }; class B:public A { char b; int a; }; What is the size? Answer a)5 bytes for class A and 5 bytes class B b)4 bytes for class A and 8 bytes class B. c).... d)....

2 Answers   Bally Technologies,


write a c++ to define a class box with length,breadth and height as data member and input value(),printvalue() and volume() as member functions.

3 Answers  


Categories