What do you mean by pure virtual functions?

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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, 3146👍, 0💬

Which recursive sorting technique always makes recursive calls to sort subarrays that are about half size of the original array?
Which recursive sorting technique always makes recursive calls to sort subarrays that are about half size of the original array? Mergesort always makes recursive calls to sort subarrays that are about half size of the original array, resulting in O(n log n) time. 2012-02-21, 3319👍, 0💬

How can you quickly find the number of elements stored in a a) static array b) dynamic array ? Why is it difficult to stor
How can you quickly find the number of elements stored in a a) static array b) dynamic array ? Why is it difficult to store linked list in an array? How can you find the nodes with repetetive data in a linked list? Write a prog to accept a given string in any order and flash error if any of the char... 2012-02-27, 3284👍, 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, 3195👍, 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💬

What’s the output of the following program? Why?
What’s the output of the following program? Why? #include <stdio.h> 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, 3173👍, 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, 3152👍, 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, 3147👍, 0💬

What is polymorphism? Explain with an example?
What is polymorphism? Explain with an example? "Poly" means "many" and "morph" means "form". Polymorphism is the ability of an object (or reference) to assume (be replaced by) or become many different forms of object. Example: function overloading, function overriding, virtual functions. Another exa... 2012-02-24, 3126👍, 0💬

What is a scope resolution operator?
What is a scope resolution operator? A scope resolution operator (::), can be used to define the member functions of a class outside the class. 2012-02-23, 3030👍, 0💬

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