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Solve this using C++ code
Write a solution in any language to the following: Given a large list of integers (more than 1 000 000 values) find how many ways there are of selecting two of them that add up to 0
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What are virtual functions?
A virtual function allows derived classes to replace the implementation provided by the base class. The compiler makes sure the replacement is always called whenever the object in question is actually of the derived class, even if the object is accessed by a base pointer rather than a derived pointer. This allows algorithms in the base class to be replaced in the derived class, even if users don't...
MCBod
- Mar 31st, 2010
A virtual function is a member function of a class fro which it expects child functions to provide their own implementations. My specifiying the function as virtual we allow polymorphism to take place...
gunjan.chandra
- Jun 12th, 2009
It is a functions whose behaviour can be?overriden with an inherited class by a function of same signature. It is an important part of OOPS and Polymorphism.
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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 difference between Function and Member function?
KAIRAV
- Feb 27th, 2018
NO BRO!! A member function can be defined outside the class
SomGollakota
- Jun 13th, 2007
Assuming function is not a part of any class, and member function (obviously) is a part of a class, the difference is their scope.1. Function - is normally refered to a C-style function which has a gl...
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While copying the objects if we say X a=b, X a(b) What will it call, assignment operator or copy constructor? Justify
lddung19720603
- Jul 28th, 2009
In both cases the copy constructor will be called. If we have a=b alone, then the assignment operator will be called.
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How can you force instantiation of a template?
A
moonlight100783
- Jan 20th, 2008
To add...When a template is specialized as above, it is mandatory to define the same. The C++ compiler will not generate a class for the specialization.
michaelpyles
- Dec 29th, 2007
You can force the instantiation of a specialization of the template by specifying a prototype somewhere in your code. For example:template <class T> class A { T x; ...
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What is an iterator?
vidhudatta
- Sep 23rd, 2009
Iterator is an object that allows the programmer to traverse through the entire collection.
shwetashreemal
- Jul 25th, 2009
Iterator is a class that is used to traverse through the objects maintained by a container class.these are five types are:-1.Input iterator2.output iterator3.forward iterator4.bidirectional iterator5....
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What is the difference betwen wait() and delay()?
yzesong
- Aug 1st, 2009
In a proces which issues wait( ) will suspend itself until either a certain process terminated(wait(n), n is PID) or all process terminated (wait()). Delay is like pausing for a certain period of time, same as sleep( ).
3bu1
- Aug 21st, 2007
Wait()....event triggereddelay()....time trigerred
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If static int temp; defined in one file1, then can we use this same temp variable in file 2 ? Is it possible to do this with EXTERN ?
kalayama
- Dec 5th, 2006
Well, the static variable should not be accessed from outside the file in hich it is defined. That's how static is defined.The intended purpose of static is to make the variable "invisible" to other programs.Hence you must use extern if you want to access it across files.Cheers,Kalayama
Arun
- Nov 30th, 2006
Hi, We can't able to use more than one storage class specifier in same variable.Regards,ARUN
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Under which conditions compiler provide default constructor to an object when no default constructor is defined in the class definition?
Prasad2008
- Jun 10th, 2008
If the class designer has not provided any constructor within the class, but we are trying to create an object of that class without passing any argument , then compiler will provide a defau...
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What are Polymorphic Classes?
Khansnaina
- Sep 20th, 2019
I want implications of polymorphic use of classes
Niranjan.ambati
- Apr 9th, 2009
Polymorphic means many forms. The object of the polymorphic class pointer can store any derived class objects and called respective member functions when its object member functions is called automati...
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Virtual key word
can access any private member of the base class through the derived class FUNCTION IF IT IS VIRTUAL?
burraganesh
- Dec 7th, 2008
No way,Ex:#include<iostream>using namespace std;class base{ private: int a; public: ...
arun_goel3
- Jul 15th, 2008
using typecasting and virtual we can access the private member of base class#include <iostream>using namespace std;class base {int i;virtual void update(int j) {cout << "in base updat...
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Exception handling vs. return values to signal an error
Why we would use exception handling rather than different return values to signal an error?
ajrobb
- Sep 22nd, 2010
When programs throw and exception, control is transferred to the innermost matching catch statement. If the exception is not caught with the program, the program terminates. All automatic variables ar...
thumbeti
- Nov 1st, 2009
Using exceptions, it becomes easy to pass multiple types?of values from a single function. Handling the exceptions is hirachical.If we dont have exceptions, it will be difficult to return multiple values from a function.
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What should you do gain access to Private Base Class Data
tapan.gajera
- Jan 3rd, 2010
B. You should use a public or protected base class function.Example: class Base{private: int a;public: Base() {a = 5;} &nbs...
j_l_larson
- Oct 19th, 2009
F. None of the above are entirely the right answerYou can provide a method in the base class to allow the private data to be read or written and then provide an access specifier in the derived class w...
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Default Parameter
What is default parameter? Can a overloaded function have a default parameter?
yzesong
- Jul 29th, 2009
This is my answer, please correct me if I am wrong.Overloading functions with default parameters will cause compile error for ambiguous calling on the overloaded function. But it really depends ...
amarnathsatrawala
- Jun 16th, 2009
The overloads may not always be banned. The compiler could remove the parameter with default values for the overload resolution. e.g. The signature of the fuction after removing the default parameters...
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Unary Postfix Operator Overloading
Which of the following statements accurately describe unary postfix operator++ overloading in C++?A. It can be overloaded with no parameters when the operator function is a class member.B. It can only be overloaded if the operator function is a class member.C. It can be overloaded with one parameter when the operator function is free standing function (not a class member).D. To overload it at least...
preethi
- Sep 14th, 2013
D
ajrobb
- Sep 22nd, 2010
DA. It can be overloaded with no parameters when the operator function is a class member.No. As a class member it must have one dummy parameter:class A { A operator++(int); }; B. It can only be over...
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Function Resolution
Explain the resolution of a function by C ++ complier in the case of function overloading.
sandhya
- Feb 11th, 2014
Mangled names or name mangling
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