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What does extern mean in a function declaration?
What does extern mean in a function declaration? It tells the compiler that a variable or a function exists, even if the compiler hasn’t yet seen it in the file currently being compiled. This variable or function may be defined in another file or further down in the current file. 2012-03-09, 3194👍, 0💬

What are virtual functions? C++
What are virtual functions? C++ 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 poin... 2012-02-22, 3192👍, 0💬

What is an Iterator class? C++
What is an Iterator class? C++ A class that is used to traverse through the objects maintained by a container class. There are five categories of iterators: input iterators, output iterators, forward iterators, bidirectional iterators, random access. An iterator is an entity that gives access to the... 2012-01-05, 3192👍, 0💬

Differentiate between the message and method. C++
Differentiate between the message and method. C++ Message: * Objects communicate by sending messages to each other. * A message is sent to invoke a method. Method * Provides response to a message. * It is an implementation of an operation. 2012-01-09, 3191👍, 0💬

Define namespace. C++
Define namespace. C++ It is a feature in C++ to minimize name collisions in the global name space. This namespace keyword assigns a distinct name to a library that allows other libraries to use the same identifier names without creating any name collisions. Furthermore, the compiler uses the namespa... 2012-01-04, 3188👍, 0💬

What is the difference between char a[] = “string”; and char *p = “string”;?
What is the difference between char a[] = “string”; and char *p = “string”;? In the first case 6 bytes are allocated to the variable a which is fixed, where as in the second case if *p is assigned to some other value the allocate memory can change. 2012-03-07, 3186👍, 0💬

What is abstraction? C++
What is abstraction? C++ Abstraction is of the process of hiding unwanted details from the user. 2012-02-22, 3183👍, 0💬

Anything wrong with this code? ......
Anything wrong with this code? T *p = new T[10]; delete p; Everything is correct, Only the first element of the array will be deleted”, The entire array will be deleted, but only the first element destructor will be called. 2012-03-02, 3182👍, 0💬

When should you use multiple inheritance?
When should you use multiple inheritance? There are three acceptable answers: "Never," "Rarely," and "When the problem domain cannot be accurately modeled any other way." 2012-03-19, 3176👍, 0💬

What problem does the namespace feature solve?
What problem does the namespace feature solve? Multiple providers of libraries might use common global identifiers causing a name collision when an application tries to link with two or more such libraries. The namespace feature surrounds a library’s external declarations with a unique namespace tha... 2012-03-22, 3174👍, 0💬

What’s the output of the following program? Why?
What’s the output of the following program? Why? #include &lt;stdio.h&gt; main() { typedef union { int a; char b[10]; float c; } Union; Union x,y = {100}; x.a = 50; strcpy(x.b,\"hello\"); x.c = 21.50; printf(\"Union x : %d %s %f \n\",x.a,x.b,x.c ); printf(\"Union y :%d %s%f \n\",y.a,y.b,y.c)... 2012-02-27, 3171👍, 0💬

What are each of the standard files and what are they normally associated with?
They are the standard input file, the standard output file and the standard error file. The first is usually associated with the keyboard, the second and third are usually associated with the terminal screen. Detemine the code below, tell me exectly how many times is the operation sum++ performed ? ... 2012-04-05, 3170👍, 0💬

What values are be stored in 'a' after the above sample code is run if it is run on a system where pointers are two bytes lo
char a; char ca[] = {'a','e','i','o','u','y'}; char* pca = ca; pca += 2; a = *pca; What values are be stored in 'a' after the above sample code is run if it is run on a system where pointers are two bytes long? 1) a = 'u' 2) a = 'e' 3) a = 'i' 4) The code is illegal. Only a pointer can be added to a... 2012-04-20, 3166👍, 0💬

What is the difference between class and structure?
What is the difference between class and structure? Structure: Initially (in C) a structure was used to bundle different type of data types together to perform a particular functionality. But C++ extended the structure to contain functions also. The major difference is that all declarations inside a... 2012-02-06, 3165👍, 0💬

What is a dangling pointer? C++
What is a dangling pointer? C++ A dangling pointer arises when you use the address of an object after its lifetime is over. This may occur in situations like returning addresses of the automatic variables from a function or using the address of the memory block after it is freed. The following code ... 2012-01-06, 3164👍, 0💬

What is a class? C++
What is a class? C++ Class is a user-defined data type in C++. It can be created to solve a particular kind of problem. After creation the user need not know the specifics of the working of a class. 2012-02-20, 3160👍, 0💬

Tell how to check whether a linked list is circular C++
Tell how to check whether a linked list is circular C++ Create two pointers, each set to the start of the list. Update each as follows: while (pointer1) { pointer1 = pointer1-&gt;next; pointer2 = pointer2-&gt;next; if (pointer2) pointer2=pointer2-&gt;next ;if (pointer1 == pointer2) { pri... 2012-01-31, 3154👍, 0💬

What is a COPY CONSTRUCTOR and when is it called?
What is a COPY CONSTRUCTOR and when is it called? A copy constructor is a method that accepts an object of the same class and copies it’s data members to the object on the left part of assignement: class Point2D{ int x; int y; public int color; protected bool pinned; public Point2D() : x(0) , y(0) {... 2012-02-14, 3151👍, 0💬

Why are arrays usually processed with for loop?
Why are arrays usually processed with for loop? The real power of arrays comes from their facility of using an index variable to traverse the array, accessing each element with the same expression a[i]. All the is needed to make this work is a iterated statement in which the variable i serves as a c... 2012-02-29, 3150👍, 0💬

Define a constructor - What it is and how it might be called (2 methods).
Define a constructor - What it is and how it might be called (2 methods). Answer1 constructor is a member function of the class, with the name of the function being the same as the class name. It also specifies how the object should be initialized. Ways of calling constructor: 1) Implicitly: automat... 2012-02-03, 3150👍, 0💬

What do you mean by pure virtual functions?
What do you mean by pure virtual functions? A pure virtual member function is a member function that the base class forces derived classes to provide. Normally these member functions have no implementation. Pure virtual functions are equated to zero. class Shape { public: virtual void draw() = 0; }; 2012-02-24, 3145👍, 0💬

What are proxy objects? C++
What are proxy objects? C++ Objects that stand for other objects are called proxy objects or surrogates. template &lt;class t=""> class Array2D { public: class Array1D { public: T& operator[] (int index); const T& operator[] (int index)const; }; Array1D operator[] (int index); const Arra... 2012-01-12, 3144👍, 0💬

What is the value of "count" immediately before the return statement above is executed?
int count=0; class obj { public: obj(){ count++; } ~obj() { count--; } }; main() { obj A,B,C,D ; return 0 ; } What is the value of "count" immediately before the return statement above is executed? 1) 0 2) 1 3) 2 4) 3 5) 4 2012-04-25, 3132👍, 0💬

What do you mean by binding of data and functions?
What do you mean by binding of data and functions? Encapsulation. 2012-02-16, 3130👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML