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Why an empty Structure will occupy 2Bytes in C++
dkuy1
- Aug 9th, 2009
The Standard C++ language definition says: A class with an empty sequence of members and base class objects is an empty class. Complete objects and member sub-objects of an empty class type shall h...
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What are auto static variables and auto extern variables?
Biju Nair
- Jun 29th, 2006
A variable declared in one file can be used in another file by declaring it as extern in the second file.
mohit12379
- Apr 20th, 2006
Neither there is a concept of auto static var and Nor a auto extern varibales because auto var are local variable whose lifetime is within a block and located on stack area . Process w...
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Acrobat Plug-in getting triggered automatically
HiI am new to this site and have no idea where to post this question. I will really appreciate if someone can help me solve this problem. I am developing an acrobat plug-in for Acrobat professional 9 which will export all annotations in original document into an xfdf document.The plug-in must get triggered on saving the original document after creation of annotation.For this I captured before save...
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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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Why does constructor doesn't have a return type ?
Yaron Jackoby
- Jun 10th, 2011
The constructor just return the object itself.when you call to new you get the object. the new calls to the constructor of the class in order to create the object and the return value from the new is the pointer of the object so this is the return value.
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What is the difference between c&c++?
pammi_11
- May 31st, 2008
c is a procedural language. where as c++ is object oriented programming language.
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Difference between "C structure" and "C++ structure".
sachin_mundhra
- Dec 18th, 2009
No concept of encapsulation, code is different than the data in case of C structure. This is possible in C++ structure.
samitriani
- Jul 8th, 2008
C does not have limitation access. Structures in C are used to regroup data from different types.In C++ structure have limitation access propreties (private,public protected) with public access as default, can contain methods and can be used as a class.
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Classes
What error is caused by the following code ?class TemperatureList { public: TemperatureList( ); private: double * list; int size;};void func(Money amount);[...]int main{ TemperatureList list1; func(list1); return 0;}Choose one answer. a. double free b. divide by zero c. illegal argument d. no error
amithere007
- May 26th, 2011
The function func is taking an object of Money class which is not defined in this scope so that will give a compilation error. It will give the error as "Money' was not declared in this scope ".
wlochaty
- Jan 19th, 2011
c. illegal argument list1 object passed to a func() is diferent type than the func() param should be.func() expects an object of Money type.
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What is the difference between Object and Instance?
anujaprasad2002
- Jul 18th, 2006
An object is an instance of a class.Suppose that class name is myclass class myclass{-----}When this myclass is called in mainmain(){ myclass cplus; /cplus is an object of the class m...
Priya Pise
- May 10th, 2006
Hi Ravi Shankar !I m not agree with u completely so can u plz enlight on the Instance again ..
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In c++ have a default constructor ?
ganga prasad rao.aloori
- Nov 26th, 2005
Yes in c++ a class can have a default constructor.a default constructor is a constructor which doesn't pass any arguements to it.
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Difference between "vector" and "array"?
sivakumar.v
- Jul 3rd, 2008
Hi, for the above answer, i am little bit disagreeing, like VECTOR is UNIDIRECTIONAL ?? what does that mean ?? exactly, you mean to say that we cannot have multidimensional vectors ?? if that is ...
bhradwj
- Apr 4th, 2006
The main difference between vector and array isAlways vector is represented as uni-dimensional (ie., one dimensional) but whereas Array can be represented by both one-dimensional as well as two dimensional.Thanks....
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C++ open ended experiment
The objective of this open ended experiment is to develop an ISE DEPARTMENT INFORMATION SYSTEM application using C++. The primary emphasis of the experiment is to understand and gain knowledge of principles of object oriented programming concepts so as to apply these concepts in implementing real world problems. Students should take this work seriously as these efforts will be useful for developing...
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Write syntax for ternary and condition operator
Abhisek Pattnaik
- May 3rd, 2011
Ternary Operator?:Equivalent toif(condition_expr) {return true;}else {return false};Syntax(condition_expr)?(return true):(return false);
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What will happen if I say delete this
Faramarz Rabii
- Oct 22nd, 2010
The danger only exists if you do a stack variable. There is no problem if you use a "new" ed object.
sachin_mundhra
- Dec 18th, 2009
Memory corruption/exception. In case object is local(stack) this will corrupt the stack.
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What are the key differences between C & C++
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SARAVANAN SIVAJI- Member Since Aug-2007 | Aug 1st, 2007
The main difference between C and C++ are:
1. C is a procedural language whereas C++ is a non-procedural language.
2. C gives importance to functions (methods) whereas C++ gives importance to both functions and data.
3. C allows the data to flow around the functions freely whereas C++ wraps up the data and functions together, due to that datas were not allowed to flow around freely in C++. This is said to be Encapsulation in C++
Other differences, ( actucally there is lot to mention......here are the two )1. C allows struct, union, and enum types to be declared in function prototypes, whereas C++ does not.
2. A struct, union, or enum declaration in C++ declares an implicit typedef, while in C it does not
SARAVANAN SIVAJI
- Aug 1st, 2007
One more point: we can include..........In C, the members in the struct, by default, public.In C++, the members in the class, by default, private.
SARAVANAN SIVAJI
- Aug 1st, 2007
The main difference between C and C++ are:1. C is a procedural language whereas C++ is a non-procedural language.2. C gives importance to functions (methods) whereas C++ gives importance t...
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What is proper and improper inheritance? Explain with an example?
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michaelpyles- Member Since Dec-2007 | Dec 29th, 2007
Proper inheritance occurs when the derived class "IS A" specialized type of the base class. Example Cat IS A Animal.
Improper inheritance occurs when a class is inherited from merely for code reuse, without having any other relationship. Example Cat Inherits from Engine. A Cat is not an engine however both an engine and a cat purr.yzesong
- Jul 31st, 2009
As long as no diamond problems (improper inheritance), single or multiple inheritance can all be proper inheritance. When usng multiple inheritance with diamond problem, you can use virtual inheritance to make the multiple inheritance a proper one.
michaelpyles
- Dec 29th, 2007
Proper inheritance occurs when the derived class "IS A" specialized type of the base class. Example Cat IS A Animal. Improper inheritance occurs when a class is inherited from merely f...
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C++ programming function help
I'm having some trouble trying to program these problems and putting them into the main function. Please help me by giving some advice or website that offer good information for me.1. Write a function that accepts a string of characters from a user and displays the string one word per line.2. Write a function that accepts a string of characters, then output all the characters of the string in a reversed...
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What are the types of STL containers?
srinu5019
- Mar 21st, 2011
Sequential containers-> vectors,Deque,listAssosiative containers->set,multiset,map,multimapDerived containers->stack,queue,priority queue
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What is the Size of an Empty Class
What is the logic behind size of an empty class = 1? (As per C++)Ex:class base {};main(){printf("Size of the Empty Class is: %dn", sizeof(base));}It gives output: Size of the Empty Class is: 1I have not got the reason / logic behind this.Can anyone help me?
nilesh2080
- Mar 11th, 2011
The size of the empty class is i byte because empty class will provide the default constructor, default destructor, default copy constructor and default assigment operator. These function are called by the address of the pointer to functions, so the size of these address is 1 byte.
amitmanish
- Mar 4th, 2011
The size of an empty class's object is 1. The reason for this is that suppose if we have the size as 0, then two objects created one after the other would point to the same address. Having the siz...
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Copy Constructor
Explain what is copy constructor and what is the difference between copy constructor and overloaded assignment operator
amitmanish
- Mar 4th, 2011
Copy contructor is parameterised constructor with a argument which is a reference to an object of the class. Why we need a reference? the answer is that if we don't use a reference and instead u...
manas111
- Jan 13th, 2011
Constructor having reference type parameter;It is used to declare & initialise an object from another object.
C++ Interview Questions
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