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How to implement the runtime polymorphism using c++. examples.
ripon07
- Jul 13th, 2010
First We Know that Polymorphism means Single Interface Multiple Methods so whenever we want to implement this into our program we use it in form of function overloading and operator overloading but th...
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What is the difference between instance and object?
paritoshgautam
- Jul 22nd, 2010
Suppose there are number of classes and their objects whenever we call a particular object at run time then memory is allocated to that particular object and that is called Instance.
adeelqamar8
- Sep 12th, 2008
When you create a custom type (class) in any language, that class in OOP is called Object and when you create an istance of this class just as we create instance of built-in types e.g. (int a,float b)?it is called instance of the object.
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When will a constructor executed?
irfan.omair
- Jul 30th, 2010
Constructor of any class gets any executed only when an object of that class is being created either dynamically using new or locally.
samiksc
- Jan 19th, 2006
A constructor is executed when an object of a class is getting initialized (constructed)
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Implicit Subtyping
What is Implicit Subtyping?
Mohinder Pal
- Aug 7th, 2010
In C language the compiler will do implicit type conversion from one intrinsic type to another ex//***********int a;a=123.23;printf("%d",a);//**************The compiler will prompt no err as it does c...
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How do you represent static members and abstract classes in Class Diagram?
SKPasu
- Aug 19th, 2010
Abstract classes and pure virtual functions are represented by writing their names in italics.An abstract class can also be marked with the {abstract} property. i.e
you can write this {abstract} besides the abstract class name.Static members are represented as underlined members.
Regs,PSKPNVRKPrasad
- Jul 20th, 2009
Abstract classes: They are modeled with their names in italicsStatic Members: They are modeled with an underline
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Empty Class
Why an empty class takes some bytes in memory?
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Describe about storage allocation and scope of global, extern, static, local and register variables?
SKPasu
- Aug 19th, 2010
Everybody knows about the scope, but the real thing is for the storage allocation:-Memory is devided into four segements namely stack, heap, data, code segments.Local Variables are stored in Stack. Th...
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Package Access Modifier
What do you mean by package access modifier?
shatish15
- Sep 3rd, 2010
I don't understand how you can say about the private and protected access modifiers for a class. When I created a program with private and protected access modifiers, the error was that these modifiers are not allowed here.
shamli85
- Apr 2nd, 2010
We can use protected and private modifier with a Class only if it is an inner Class.
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What is polymorphism? Explain with an example.
ambeer
- Sep 5th, 2010
Polymorphism means takes more than one form. Means one function or operator can have same name but differnet parameters and different implementations. There are two types of polymorphism.1. Static pol...
samiksc
- Jan 25th, 2006
Polymorphism is the ability to assume many forms. In short it refers to several methods / operators sharing the same name but having different parameter list and different implementations. Variables a...
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What is the most efficient way to count the number of bits which are set in a value?
grvmab
- Oct 2nd, 2010
#include<stdio.h>void main(){int n,r,c=0;clrscr();printf("Enter number:");scanf("%d",&n);while(n>0){r=n%10;c++;n=n/10;}printf("nNumber of bits:%d",c);getch();}
stephen_benny
- Apr 3rd, 2010
As part of SSE4 instruction set available in Intel and AMD there is one instruction named POPCNT to count number of bits set to 1. Furthermore, you can use it in gcc through the builtins __built...
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How can I convert integers to binary or hexadecimal?
grvmab
- Oct 3rd, 2010
#include<stdio.h>#include<conio.h>void main(){int i,n,b[10],c=0;clrscr();printf("nEnter the num:");scanf("%d",&n);while(n>0){b[c]=n%2;c++;n=n/2;}printf("nBinary num:");for(i=c;i>0;i--){printf("n%d",b[i]);}getch();}
RichNistuk
- Oct 1st, 2005
Here is my solution:#include <iostream>#include <iomanip>#include <sstream>using namespace std;string toBinary(unsigned int num){ stringstream s; for(int i=0; i<sizeof...
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Can static class be inherited in super class? If so how. What are the various types of OOPS in Dot Net architecture?What is the method that is used in Dot Net (like top-down, water fall)
Can static class be inherited in super class? If so how.
What are the various types of OOPS in Dot Net architecture?What is the method that is used in Dot Net (like top-down, water fall)
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santosh.ifc- Member Since Oct-2007 | Mar 19th, 2008
the static method will be inherited to the sub class only
jasvinderSingh
- Feb 26th, 2010
Static class can be inherited in super class..NET architecture is COMPONENT ORIENTED not a OOPS and bottom-up method is used.
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What is an object?
Ranjit
- Oct 14th, 2005
Object is an instance of class
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Can we specify variable field width in a scanf() format string? If possible how?
RobertREvans76
- Dec 3rd, 2010
No, only a constant is acceptable. However, it is possible to construct the format string on fly with the desired field width, e.g., char format[20]; sprintf(format, "%%%ds", sizeof(buff)-1)...
Ajay K
- Jul 1st, 2007
Yes . e.g. scanf ("%10s", str ); only 10 chars would be taken in
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What is the difference between overloading and overridding?
navneetgoyal2000
- Jan 4th, 2011
Additionally:Overloading is done in same scope (i.e. having two functions with same name (but different signature in same class scope or same file scope).WhileOverriding is specifically related to inh...
attiq.ur.rehman92
- Oct 28th, 2009
Overloading is related to the use of a function or an operator. For example you can use a function for adding some integers as well as floats so this function is overloaded as it works for two differe...
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Private Inheritance
What is Private Inheritance? Give its syntax?
navneetgoyal2000
- Jan 4th, 2011
Private Inheritance is inheriting a (base) class, privately, making all members of Base class, private in derived class. In that case, no objects of derived class OR any member of derived of derived c...
snigdha1
- Jun 4th, 2010
Private Inheritance makes all of the public functions of the parent class private in child class. They can be used in order to implement child class without being accessible to outside world.Synt...
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Explain the need for "Virtual Destructor".
navneetgoyal2000
- Jan 4th, 2011
Writing Virtual Destructor is not always necessary, though it is a good practice.Your Destructor MUST be Virtual, specially in cases, when your class deals with objects on heap, i.e. when one or more ...
Ruth Samuel
- Aug 30th, 2005
When classes are inherited, we need to make the base class destructor virtual ? to make sure when the object is destroyed, all the derived class destructors also called. Otherwise the derived class de...
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Why preincrement operator is faster than postincrement?
navneetgoyal2000
- Jan 5th, 2011
Post Increment / Decrement is always slower and costlier than their Pre forms (Pre Inc- or Pre Decrement).Both do Increment / Decrement, but in case of Post, it has to return the OLD value of the vari...
Freighter
- Sep 17th, 2009
"Postincrement is usually less efficient than preincrement because it has to remember & return its original value"That is, apart from also doing the increment operation, Postincrement has to remember & return its original value.Exceptional C++, Herb Sutter, Item #6, p19
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Difference between pass by reference and pass by value?
navneetgoyal2000
- Jan 5th, 2011
Pass By Ref is used Generally, when the Caller wants to retain the ownership of the variable.Most Imp, Pass By ref is used mostly, when Function Chaining / Assignment Chaining is to be implemented.Wit...
ramaswamyratnala
- Jan 27th, 2009
There two ways can passes an argument to subroutine (method).1)call-by-value2)call-by-referencecall-by-value:----------------In this process first method copies the value of an argument in to formal p...
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Which bit wise operator is suitable for checking whether a particular bit is on or off?
navneetgoyal2000
- Jan 5th, 2011
Its Bitwise AND (&)for Ex, I need to check if 3rd bit from right(Starting from 0th) is ON in a variable x or OFF.then see this code:int x=24;int tester=1;tester = tester << 3; \Makes te...
Sudheendra.S.N
- Sep 11th, 2008
XOR?Operator is right. XOR the given?bit with 1 if the bit is 1 then 0 is the o/p else 1 is the o/p.
OOPS Interview Questions
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