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Define copy constructor? What is the use of copy constructor?
rajangidwani
- Sep 8th, 2009
Copy constructor is 1. a constructor function with the same name as the class 2. used to make deep copy of objects. There are 3 important places where a copy constructor is called. 1. When an object i...
vss
- Jun 29th, 2006
A copy constructor is used to initialize a newly declared variable from an existing variableA variable is declared which is initialized from another object,A value parameter is initialized from its co...
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What happens to the member pointers when an exception occures in constructor, while allocating memory ? how can we over come this ?
heyjoe
- May 22nd, 2007
When a constructor throws an exception then it means that constructor failed (duh!!) and the object is never created.Just write a simple class to test it out yourself.
mohit12379
- Jul 28th, 2006
Offcourse it will result memory leak.... so use auto_ptr for such thing .. see following example, i have used two types to avoid memory leaks one is auto_ptr and another is initialize function#include...
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Function Pointers
Why function pointers are not dereferanced?
mehulgala177
- Sep 22nd, 2011
It is possible to dereference a function pointer. By doing so, v will get the address of the function it points to. Try this code : "c #include #include using namespace std; ...
Oleg Alexandrov
- Jun 24th, 2011
Because there is no "object" or "value" which you'd get by dereferencing a pointer to it. Functions are not objects. You cannot copy them, delete them, create them using "new", etc. They only exist as...
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Classes
How many parameters are there in a binary operator implemented as a friend?Choose one answer. a. 2 b. 0 c. 1 d. as many as you need
Oleg Alexandrov
- Jun 25th, 2011
Since it is a friend, it is not a member. So the syntax has to be operator myOperator(s1, s2). So there are two arguments.
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Function Linkage Mechanism
What is function linkage mechanism? Can inline function be used at run time? Why or why not?
sunil
- Jul 26th, 2014
Inline functions body are made to expand at compile time. So they are expanded at the time of compilation, since compiler decides whether the function is going to be inline or not.
std.approach
- Jun 11th, 2013
This link may be helpful
http://www.exforsys.com/tutorials/c-plus-plus/inline-functions.html -
Function pointer
How to assign function pointer to static function?
ak.nextptr
- Jul 31st, 2012
If int fn(char ch,int a) is static function then
function pointer type to above static function will be
int (*)(char , int )cooder
- Apr 26th, 2012
Using the class name. In case of non static function we need to use the this pointer.
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What is the difference between obeject oriented programing langauge and structure oriented programing langauge
potipireddi
- Jan 7th, 2008
Structured Programming Language follows Top Down approach where as Object oriented programming language follows Bottum Up approach.
Basveshwar
- Oct 10th, 2007
In structured programing data is not more important it starts the process1) Start data2) How to access3) DataWhile in object oriented data is more importantdataHow to access start data
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What is difference between Constant Object and Constant variable
swatichari
- Sep 30th, 2010
Constant Object is a variable of user-defined class which do not invode non-const member function.Constant variable sustains a value constant of built-in? data type.
jay
- May 16th, 2007
Constant variables are the variables whose value cannot be changed through out the programme but if any object is constant, value of any of the data members (const or non const) of that object cannot be changed through out the programme. Constant object can invoke only constant function.
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What is the difference between realloc() and free()
cshaw
- Mar 31st, 2009
The free subroutine frees a block of memory previously allocated by the malloc subroutine. Undefined results occur if the Pointer parameter is not a valid pointer. If the Pointer parameter is a null v...
dasam
- Mar 29th, 2007
The realloc() function changes the size of the memory object pointed to by ptr to the size specified by sizefree() function deallocates the block of memory previously allocated using a call to malloc, calloc or realloc, making it availbale again for further allocations.
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What is difference between object oriented programing language and structure oriented programing?
sangappa_geek
- Mar 20th, 2007
We can resuse the code in object oriented language. we can handle errors properly.everything relates to real world objects.
kesi
- Feb 26th, 2007
Object Oriented Programming : It means, which follows object oriented concepts that is object oriented programming for example : c++, javaand also c++ is not complete objected oriented. But...
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How to write a program such that it will delete itself after execution?
tahoekid
- Jun 13th, 2011
The Richter method does delete the original file, but the temporary file remains behind.? I compiled this as-is, and on Windows Server 2003, and 64 bit Windows 7, the temp file is not deleted. Presum...
kumar
- Mar 18th, 2006
if the solution is needed for the unix platform. Then you can create a pthread at the bottom of the program, take the current process id of the parent and make it a deamon by using the standard unix c...
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What is a "RTTI"?
mohit12379
- Apr 20th, 2006
Run-time type information (RTTI) is a mechanism that allows the type of an object to be determined during program execution. RTTI was added to the C++ language because many vendors of class libraries ...
A
- Jan 28th, 2006
In case of Virtual function we are responsible for deciding the function at run time. Its our logic that reflects and no one does any thing.Where as in case of RTTI TYPE is found of object. We dont do any thing for that. We simply use that.
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What is Psychic Windows?
(In relation with Windows Programming using VC++)
pawan
- Jul 15th, 2006
Need information about psychic window for exam.
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Class A(){};int main(){ A a;}Whether there will be a default contructor provided by the compiler in above case ?
bappa
- Jun 5th, 2006
Constructor is initialized the data members....in the above case no data members r there in the class.....so....i think compiler call default constructor but it does nothing...
vidhya165
- Jan 30th, 2006
When a c++ program is compiled and executed the constructor is invoked first. if a constructor is not declared or defined by the user then the compiler invokes the default constructor.
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Hey anybody help me to write code for this programwap which display year,month & day presents in a year for eg.1. no. is 14 print 2 weeks2. no is 90 print 3 months3. no is 365 print 1 yearuser can input any no
chiyuwang
- Jun 20th, 2008
#include <iostream>using namespace std;void CalculateDate(const unsigned int _date);int _tmain(int argc, _TCHAR* argv[]){ unsigned int date; cout<<"...
swetha76
- Sep 27th, 2006
int rem_yr=0,yr=0, n,rem_mon=0,mon=0,rem=0,wek=0;printf(" enter a numbern");scanf("%d",&n); if(n>=365) { yr = n/365; rem_yr =n%365; &n...
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C++ Interview Questions
Ans