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Static Constant Function
Consider a static const function y() that is private member function of a class Y. What do the static and const mean? When could this function be used?
amitmanish
- Mar 4th, 2011
A static function which is private to a class will lead to a compilation error as it will be inaccessible.If put in the public section it will compile.Now for const, a const function is meant not to m...
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Memory Allocation
When is memory allocated for a function of a class? Is it when the program is complied, or only when the function is called?
wlochaty
- Jan 19th, 2011
Memory will be alocated during compilation but when there is no objects of the class than no memory may be allocated. Compiler may (not must) do some optimalizations when there is no instances of the class (no funcion call).
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Base Class Pointer with Derived Object
Base class has some virtual method and derived class has a method with the same name. If we initialize the base class pointer with derived object, calling of that virtual method will result in which method being called?
Vincent Monsen
- Jan 31st, 2011
The derived class method will be called because the method is declared virtual in the base class.? Dynamic binding enables this.
ajrobb
- Sep 22nd, 2010
This is polymorphism, an object with at least one virtual method. When a polymorphic object is constructed, it includes a hidden vtable containing virtual function pointers and other polymorphic infor...
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Use of C++ in Daily Life
Do you agree or not that "Object Oriented Programming basic paradigms like Abstraction, Encapsulation, Aggregation, Composition, Inheritance, Polymorphism, Templates etc are based and works in a same way as human thinks and behave in our daily life? Justify your answer with very precise and to the point reasons.
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Register Relation
Why p++ is faster than p+1?
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Editorial / Best Answer
sahasranaman- Member Since Jul-2009 | Jul 1st, 2009
p++ is faster because on compilation, it gets translated to three machine instructions, where as p=p+1 needs four machine instructions. All machine instructions take the same time.
For p++, the instructions are:
mov ax,
inc ax
mov,
axFor p = p+ 1, the instructions would be,
mov ax,
mov bx, 1
add bx
mov,
axThis is why p++ is faster than p+1
Mann2920
- Jan 24th, 2011
To perform?i+1?complier has to do:1-Addition i+12-Assignment i=result of additionWhile in case of i++Value is simply increased by 1so i++ is faster
Gargona
- Feb 13th, 2010
Difference in assembler code:--$ diff -uN a2.S a.S--- ++p.S 2010-02-13 15:51:09.000000000 +0200+++ p+1.S 2010-02-13 15:50:30.000000000 +0200@@ -6,7 +6,6 @@&nb...
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Classes
Given the following class, what is syntactically wrong with the implementation of the display function?class Rational{public: Rational( ); Rational(int numer, int denom); Rational(int whole); int getNumerator( ); int getDenominator( ); friend void display(ostream& out, const Rational& value);private: int numerator; int denominator;};void display(ostream& out, const Rational& value){ out
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STL - Vector
What is the context of one and two after the following frsgment of code is executed?vector one(7, string("one"));vector two(one.begin() + 2, one.end()-3);
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Operators
In the following code fragment, which is the calling object for the less-than operator?string s1, s2;if( s1 < s2 )Choose one answer. a. s1 b. < c. s2 d. none
bhatiapy
- Nov 25th, 2010
S1 is the calling object. The compiler converts s1<s2 to below function call :- s1.operator<(s2);
a_soni
- Nov 19th, 2010
S1. As this is the object which appears on the left side of the operator, this is the calling object for it. Whereas S2 is the object which is passed as an parameter to the '<' operator function.
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Have you heard of "mutable" keyword?
vladatzar
- Oct 29th, 2010
The mutable storage class specifier is used only on a class data member to make it modifiable even though the member is part of an object declared as const.You cannot use the mutable specifier with names declared as static or const, or reference members.
erahul.ag
- Jul 2nd, 2010
Answer are correct but not perfect.The Crux is:Purpose of 'mutable' is not changing some member's values of a const object at all. (Its a side bug which comes free with functionality.)You may use muta...
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Can we generate a C++ source code from the binary file?
vladatzar
- Oct 29th, 2010
It is NOT possible!Binary file can be ONLY dissasembled to Assembler Source Code.C# CAN be decompiled and can give proper C# Source code, but this is because C# is more like interpreter and .NET ...
sanjay Maheshwari
- Sep 17th, 2010
It is possible technically, because high level language codes converted into low
level, so there are some ways to converts this low level to high level..For
Example 2 - 0000 0010so it can be converted 0000 0010..There
are some software which are used in private areas. -
Operators
Which of the following operators cannot be overloaded?Choose one answer. a. [ ] b. == c. . d. =
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Classes
Who can access private data in a class?Choose one answer. a. members of the class b. friends of the class c. everyone d. A and B
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Diff betweeen static and local
In the below prog,node * q is local to a function add() but it acts as static .how?#includeusing namespace std;class ll{public: struct node{ int data; node *link; }*p;ll(){p=NULL;}int add(int x){ node *q,*r;if(p==NULL){ r=new node; r->data=x; r->link=NULL;q=r; p=q;}else{r=new node;r->data=x;r->link=NULL;q->link=r;q=q->link;}return 0;}void display(){ node *q; q=p;while(q!=NULL){cout
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Plz explain following program
In the below program ,in function add() node * q is local but it acts as static ie I mean it works correctly how is it possible?#includeusing namespace std;class ll{public: struct node{ int data; node *link; }*p;ll(){p=NULL;}int add(int x){ node *q,*r;if(p==NULL){ r=new node; r->data=x; r->link=NULL;q=r; p=q;}else{r=new node;r->data=x;r->link=NULL;q->link=r;q=q->link;}return 0;}void display(){...
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Can you explain the term "resource acquisition is initialization?"
sonal kumar
- Oct 12th, 2010
Resource Acquisition is Initialisation or shortly RAII is a term closely connected with exception handling and automatic garbage collection(speaking loosely). RAII is defined as the technique of per...
vidhudatta
- Sep 23rd, 2009
It is the technique of performing all the necessary resource allocation in constructor only and all the cleanind in the destructor.
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Two Dimension Array
A two dimension array can also be thought of asChoose one answer. a. Table. b. Array of arrays.c. A file.d. None of the above e. A and B
saritha1406
- Oct 13th, 2010
e A and BTwo dimensional arrays are epecially used in Computr programming & Accounting.It is represented in matrix format.
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What is difference between Constant Object and Constant variable
swatichari
- Sep 30th, 2010
Constant Object is a variable of user-defined class which do not invode non-const member function.Constant variable sustains a value constant of built-in? data type.
jay
- May 16th, 2007
Constant variables are the variables whose value cannot be changed through out the programme but if any object is constant, value of any of the data members (const or non const) of that object cannot be changed through out the programme. Constant object can invoke only constant function.
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Using Templates
What is the disadvantage of using too many templates?
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Exception handling vs. return values to signal an error
Why we would use exception handling rather than different return values to signal an error?
ajrobb
- Sep 22nd, 2010
When programs throw and exception, control is transferred to the innermost matching catch statement. If the exception is not caught with the program, the program terminates. All automatic variables ar...
thumbeti
- Nov 1st, 2009
Using exceptions, it becomes easy to pass multiple types?of values from a single function. Handling the exceptions is hirachical.If we dont have exceptions, it will be difficult to return multiple values from a function.
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Dynamic Binding
Why is Dynamic binding (regarding DLLs) are considered better in comparison with static binding? What are DLLs and how they work?
ajrobb
- Sep 22nd, 2010
Dynamic binding in MS Windows or shared objects in Unix are libraries compiled with position-independent code that are similar to program files. Their advantages include:1. Different programs using th...
sim_sam
- Feb 13th, 2009
While generating the binary executable, a compiler have two options:1. It can include the helper libraries (third party libraries for example) with the exe file in binary form which increases the size...
C++ Interview Questions
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