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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.
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Explain "passing by value", "passing by pointer" and "passing by reference"
navneetgoyal2000
- Jan 5th, 2011
Pass By value & Pass By Pointer are the terms came from C.Pass By Value is used when the called function needs the value for computation, and the computed result is returned back to calling f...
meghagoyal_01
- Aug 1st, 2007
Whenever a function calls arguments they are passed in two ways...call by value and call by referencecall by valueCopy of actual argument is passed thus any changes made to the formal argument [i.e. c...
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Vtable Entries
What are the entries of vtable? Which function execute fast virtual function or normal function?
navneetgoyal2000
- Jan 4th, 2011
VTable Entries: VTable is a list of VPTRs i.e. Virtual Pointers, which are the function pointers for the all of the functions for the class. These Pointers help in runtime / virtual binding of the fun...
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Operator overloading is also called redesigning the language. Please comment.
navneetgoyal2000
- Jan 5th, 2011
I do not agree with the statement.It is true that with operator overloading, you can make an operator to behave in absurd manner, but still you have limitations.Also, operator overloading feature has ...
Avi
- Aug 3rd, 2006
I Think Computer languages have certain set of operators ,which the user can use while coding ,these operators have predefined meaning in the respective language i.e the operators can operate onl...
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What is the use of Operator Overloading?
navneetgoyal2000
- Jan 5th, 2011
Feature of operator overloading has been given, to make your class' behaviour as close as to basic datatype.As in case of basic data type, you can say:int i = 5;int i1 = j = k = 6;int k1 = 6.5;k1 ...
whenkeys
- Aug 11th, 2008
Do any operation symbolizing the operator in your class.you can add/subtract/multiply/divide or do any other operation for +operator() the choice is entirely yours.Freedom you see
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What is Memory Alignment?
stylonurus
- Jan 9th, 2011
One way to align global or static variables is to use the __align qualifier. I got this example from an IBM Linux Compiler site. I think aligning data may be compiler dependant. In this example t...
RyanJames
- May 8th, 2007
Memory alignment is the restriction imposed on memory allocation in such a way that values associated with multibyte get assigned only at certain places of memory. Such Memory alignment though general...
OOPS Interview Questions
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