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Classes
What error is caused by the following code ?class TemperatureList { public: TemperatureList( ); private: double * list; int size;};void func(Money amount);[...]int main{ TemperatureList list1; func(list1); return 0;}Choose one answer. a. double free b. divide by zero c. illegal argument d. no error
amithere007
- May 26th, 2011
The function func is taking an object of Money class which is not defined in this scope so that will give a compilation error. It will give the error as "Money' was not declared in this scope ".
wlochaty
- Jan 19th, 2011
c. illegal argument list1 object passed to a func() is diferent type than the func() param should be.func() expects an object of Money type.
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What is the difference between Object and Instance?
anujaprasad2002
- Jul 18th, 2006
An object is an instance of a class.Suppose that class name is myclass class myclass{-----}When this myclass is called in mainmain(){ myclass cplus; /cplus is an object of the class m...
Priya Pise
- May 10th, 2006
Hi Ravi Shankar !I m not agree with u completely so can u plz enlight on the Instance again ..
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In c++ have a default constructor ?
ganga prasad rao.aloori
- Nov 26th, 2005
Yes in c++ a class can have a default constructor.a default constructor is a constructor which doesn't pass any arguements to it.
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Difference between "vector" and "array"?
sivakumar.v
- Jul 3rd, 2008
Hi, for the above answer, i am little bit disagreeing, like VECTOR is UNIDIRECTIONAL ?? what does that mean ?? exactly, you mean to say that we cannot have multidimensional vectors ?? if that is ...
bhradwj
- Apr 4th, 2006
The main difference between vector and array isAlways vector is represented as uni-dimensional (ie., one dimensional) but whereas Array can be represented by both one-dimensional as well as two dimensional.Thanks....
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Write syntax for ternary and condition operator
Abhisek Pattnaik
- May 3rd, 2011
Ternary Operator?:Equivalent toif(condition_expr) {return true;}else {return false};Syntax(condition_expr)?(return true):(return false);
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What will happen if I say delete this
Faramarz Rabii
- Oct 22nd, 2010
The danger only exists if you do a stack variable. There is no problem if you use a "new" ed object.
sachin_mundhra
- Dec 18th, 2009
Memory corruption/exception. In case object is local(stack) this will corrupt the stack.
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What are the key differences between C & C++
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SARAVANAN SIVAJI- Member Since Aug-2007 | Aug 1st, 2007
The main difference between C and C++ are:
1. C is a procedural language whereas C++ is a non-procedural language.
2. C gives importance to functions (methods) whereas C++ gives importance to both functions and data.
3. C allows the data to flow around the functions freely whereas C++ wraps up the data and functions together, due to that datas were not allowed to flow around freely in C++. This is said to be Encapsulation in C++
Other differences, ( actucally there is lot to mention......here are the two )1. C allows struct, union, and enum types to be declared in function prototypes, whereas C++ does not.
2. A struct, union, or enum declaration in C++ declares an implicit typedef, while in C it does not
SARAVANAN SIVAJI
- Aug 1st, 2007
One more point: we can include..........In C, the members in the struct, by default, public.In C++, the members in the class, by default, private.
SARAVANAN SIVAJI
- Aug 1st, 2007
The main difference between C and C++ are:1. C is a procedural language whereas C++ is a non-procedural language.2. C gives importance to functions (methods) whereas C++ gives importance t...
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What is proper and improper inheritance? Explain with an example?
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michaelpyles- Member Since Dec-2007 | Dec 29th, 2007
Proper inheritance occurs when the derived class "IS A" specialized type of the base class. Example Cat IS A Animal.
Improper inheritance occurs when a class is inherited from merely for code reuse, without having any other relationship. Example Cat Inherits from Engine. A Cat is not an engine however both an engine and a cat purr.yzesong
- Jul 31st, 2009
As long as no diamond problems (improper inheritance), single or multiple inheritance can all be proper inheritance. When usng multiple inheritance with diamond problem, you can use virtual inheritance to make the multiple inheritance a proper one.
michaelpyles
- Dec 29th, 2007
Proper inheritance occurs when the derived class "IS A" specialized type of the base class. Example Cat IS A Animal. Improper inheritance occurs when a class is inherited from merely f...
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What are the types of STL containers?
srinu5019
- Mar 21st, 2011
Sequential containers-> vectors,Deque,listAssosiative containers->set,multiset,map,multimapDerived containers->stack,queue,priority queue
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What is the Size of an Empty Class
What is the logic behind size of an empty class = 1? (As per C++)Ex:class base {};main(){printf("Size of the Empty Class is: %dn", sizeof(base));}It gives output: Size of the Empty Class is: 1I have not got the reason / logic behind this.Can anyone help me?
nilesh2080
- Mar 11th, 2011
The size of the empty class is i byte because empty class will provide the default constructor, default destructor, default copy constructor and default assigment operator. These function are called by the address of the pointer to functions, so the size of these address is 1 byte.
amitmanish
- Mar 4th, 2011
The size of an empty class's object is 1. The reason for this is that suppose if we have the size as 0, then two objects created one after the other would point to the same address. Having the siz...
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Copy Constructor
Explain what is copy constructor and what is the difference between copy constructor and overloaded assignment operator
amitmanish
- Mar 4th, 2011
Copy contructor is parameterised constructor with a argument which is a reference to an object of the class. Why we need a reference? the answer is that if we don't use a reference and instead u...
manas111
- Jan 13th, 2011
Constructor having reference type parameter;It is used to declare & initialise an object from another object.
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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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Register Relation
Why p++ is faster than p+1?
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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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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. =
C++ Interview Questions
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