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Why array index starts from 0[zero] only?
laxmanmanne
- Jun 23rd, 2010
This boils down to the concept of Binary digits. Take an array size of 64 for example. We start from 0 and end at 63. We require 6 bits.But, if we were to start from 1 and end at 64, we would require 7 bits to store the same number, thus increasing the storage size.
Nisikant
- Jan 30th, 2009
The array is terminated by a NULL character. Hence for array elements the space will be length-1. suppose you have 5 elements in an array. The last position is occupied by NULL character, then space a...
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Base Class Destructor
In C++, which of following statements accurately describe a base class destructor calling a virtual function override of a derived class?A. the base class destructor calls the virtual function of the base class and not of the derived class.B. the base class destructor calls the virtual function override of the derived class through th vtable.C. the C++ compiler maintains the overridden virtual function...
Thunder2010
- Jun 15th, 2010
Explanation:In C++, if you call a virtual function from a constructor or destructor, the compiler calls the instance of the virtual function defined for the class being constructed (for example, Base:...
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Multi-Dimension Array Size
If you need a function that will handle multi-dimensional arrays, you must specify the following sizes inside the square brackets.Choose one answer. a. All sizes except the first dimension b. None of the sizes c. All sizes except the last dimension d. All the sizes
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Exception Handling
Explain the exception handling features of C++ program with a suitable example
prakash77
- May 21st, 2010
C++ has some speical handlers for exception while at run time, they are try......catch.try.....catch....finally.try....throw....catch.When in above 3 cases, exception which is generated caught by CATC...
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Private Inheritance question
Hi I very recently did the C++ online Quiz and was surprised to find that my answer (1) to the following question (below) was incorrect. Is there something I am missing here, or is the answer incorrect. I thought this was the point of Private. "Always inaccessible regardless or derivation access".Apparently (3) in the correct answer! according to the quiz!The private member in derived class ...
j_l_larson
- Oct 19th, 2009
You can if the base class provides public or protected methods that modify its private data. Then derived class can expose this using access specifiers.
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GOD of Two Numbers
Write a C++ program to find the GOD of two numbers
samsam12
- May 6th, 2010
#include using namespace std;int main ( int na, char * args[]){ cout << "God made the integers; all else is the work of man ... Leopold Kronecker" << endl; return 0;}
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Inheritance
What is inheritance? why we use it? plzz can anybody explain me with one example and where we use that concept?
navneet.navu
- Apr 19th, 2010
It is an object oriented feature which provides the reusablity of code. All the properties defined in the parent class can be used by its child classes without writing the code again.
Samuel Rengarajan
- Dec 11th, 2009
All Common features are come to parent class. So we can extend this class to child classes. Child classes contais some special features.Useage of inheritance : it reduce the code. If we use inheritance, we avoid redundent code.
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Constant, Volatile and Static Function
What is the use of constant function, volatile function & static function (in programming & real life)? How do they differ from one another?
madi_czadi
- Apr 1st, 2010
To understand what are const functions, we have to know and understand const objects. Let's say we have class:class foo{int x;public:foo(int arg): x(arg){}int y;};In main function we write, so we crea...
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Memory Resize Function
Lets say contiguous memory is not available for vector's elements and it is occupied by something else. How does the resize function of vector allocate memory to be contiguous allocation?
SamReynolds
- Apr 1st, 2010
The allocate method of the vector's Allocator is invoked to allocate the new space, the vector's content is copied to the newly allocated memory block, and then the deallocate method of the ve...
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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 is function overloading and operator overloading?
Function overloading: C++ enables several functions of the same name to be defined, as long as these functions have different sets of parameters (at least as far as their types are concerned). This capability is called function overloading. When an overloaded function is called, the C++ compiler selects the proper function by examining the number, types and order of the arguments in the call....
MCBod
- Mar 31st, 2010
Overloading basically refers to the provision of second of subsequent version of the same function or operator based on different parameters.In terms of functions each different version of t...
Dhiraj Girdhar
- Jan 1st, 2009
Here are some examples1) Function overloadingclass FuncOver {public: // Constructors can also be overloaded. FuncOver(); &nb...
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What is a template?
Templates allow to create generic functions that admit any data type as parameters and return value without having to overload the function with all the possible data types. Until certain point they fulfill the functionality of a macro. Its prototype is any of the two following ones: template identifier> function_declaration; template identifier> function_declaration; The only difference between...
MCBod
- Mar 31st, 2010
A template is a function that is defined without template parameters, being parameters that have an undefined type. The logic of the function must be executable for all possible data types e.g. using ...
rajangidwani
- Jul 20th, 2009
A template parameter is a special kind of parameter that can be used to pass a type as argument: just like regular function parameters can be used to pass values to a function, template parameters all...
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What is the advantage of function overloading according to users point of view?
I know that function name is same. but each time we are writing code for each function.then in which way it is advantageous than normal function.
gleeb
- Mar 22nd, 2010
To fully understand the answer for this question, you need to be femiliar with the Polymorphism concept and an implementation of such virtual function would be for the Observer or Visitor Design Pattern.
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Nested Classes
Do Nested Clases exists? If so, where are they used?
coolba
- Mar 8th, 2010
Many of us had heard about inner class. That means class inside a class which is nothing but nesting of classes. Where You can use the members, functions of outer class but the vice versa is not true.
pavan khubani
- Feb 13th, 2010
Yes,For e.g., in class Employee, we can have class Name as member class.
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Spiral Structure
Write a program for generating a spiral structure of N number.For example: If N= 4 then the structure will be as follow-1 24 3 If N=5, then the structure will be as follow- 1 25 4 3 If N=9, then the structure will be as follow-7 8 96 1 25 4 3 If N=15, then the structure will be as follow-7 8 9 106 1 2 115 4 3 12 15 14 13 If N=18, then the structure will be as follow- 7 8 9 10 6...
Gargona
- Feb 13th, 2010
/* * File: Spiral.cpp */#include <cmath>#include <iostream>#include <vector>#include <cstdlib>using namespace std;class Spiral { int nu...
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Will the program run successfully?
Main(){ int a=2.9; float b=9; cin>>"%d %f">>a>>b; return();}
joanne.perater
- Feb 7th, 2010
This will generate compiler errors and a warning.A warning in lineint a = 2.9; //should use a typecast to convert to intand a compiler error in linecin >> "%d %f" >> a >> b; // cin does not take a right hand operand of const char
joanne.perater
- Feb 7th, 2010
This will generate compiler errors and a warning.A warning on lineint a = 2.9; // should use a typecast to convert to intand a compiler error on linecin>>"%d%f" >> a >> b; //cin does not take a right hand operand of const char
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What is the difference between a pointer and a reference?
sachin_mundhra
- Jan 28th, 2010
Pointer can be NULL but reference cannot be NULL.For example, If you write int &a; // This will give compile error, because reference cannot be NULL.
pammi_11
- May 10th, 2008
Pointer holds the address of a variable.reference holds the address of duplicate of that variable.
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What is difference between inline function and ordinary function?
sachin_mundhra
- Jan 28th, 2010
Inline function should be small in terms of line of code. Complier will replace the code whenever inline function gets called.
wow_suraj
- May 2nd, 2008
In case of ordinary function, when calling the function the scope jumps to the function and after return jumps back to the function call statement resulting in some extra execution time. While in case...
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Explain how static class member initialized?
sachin_mundhra
- Jan 28th, 2010
Example :- class Base{public:static int data;};int Base :: data = 10 ; // static class member gets initialized.
yzesong
- Jul 31st, 2009
Static variables of a class can only be initialized like this CLASS_NAME::STATIC_VAR_NAME = VAR_VALUE;
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How copy constructor works?
sachin_mundhra
- Jan 28th, 2010
Copy Constructor :- This is among one of the default method of class.Base a;Base b = a ; // Here Copy constructor gets called.Here a new instance of class Base will be created and object a data will be copied in object b.Sachin Mundhra
Raju
- Mar 20th, 2007
Copy Constructor uses class name as reference .., it is used to declare and Initialize an object from another object. i.e It is used to create a new object from existing object of same class.
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