-
What is the diffrence between static_cast and dynamic_cast in RTTI
dynamic_cast checks for datatype at runtime but static_cast checks at compilation. Is this the only diffrence b/w them or is there anything else? at the time of programming which shud we prefer to call.
Sushant Kadadi
- Feb 5th, 2008
static_cast is used for all conversions that are well defined.Like float to int. double to int etc.dynamic_cast is used for type-safe downcasting. For this one must be working with a truly polymorphic...
ranjini_r
- Jan 23rd, 2008
static_casts can be used to convert parent class to child class and vice - versa but the cast is an error for "unrelated classes".static casts can also be used to convert integral types...
-
What is the difference between block structured language and highly block structured language
-
How to multiply a varible x (int) by 7, without using multiplication & addition ?
bapu_60
- Feb 20th, 2008
Multiplication is a costly operation,costlier than bit operations.So,it is a better practice to use bit operation that is << for multiplication and >> for divsion when you are multiplying with a factor of 2 otherwise its not suggested.
praveennext
- Jan 3rd, 2007
This can be a generic solution for x*y without using *.while(y>>=1){if(y | 1) tot+=x; x<<=1; }or,for( ; y ; y>=1, x<<=1 ) if(y | 1) tot+=x;or even stupid like, while(x--) tot+=y; ;-)May be a brain teaser, but this may eat time.
-
What was the most difficult debug you have ever done?
indrajit_p
- Mar 23rd, 2008
Once there was a BIG fat bug inside my computer which had claws like ...kidding.I recently had to debug an intetioanlly bugged program in a debugging test where a function was being called recursively...
wanttochange
- Jan 10th, 2008
Can be if yr application get hanged...& you don't no even from where u should start debuging...this can be the most difficult
-
Connect C++ to MS Access
How to connect C++ to MS Access?
ganeshmoorthy
- Apr 3rd, 2008
Inline functions: in exectution of normal functions compiler overhead occurs by jumping to and fro from stack to avoid this inline functions are used it executes the given functions directly wit...
-
Macro and Inline function
What is the difference between macro and inline function?
gupta_pratibha
- Apr 7th, 2008
Compiler performs return type checking, function signature before putting inline function into symbol table. But there is no type checking for Macros. So Macros are more error prone as compared to inline functions.
-
Dangers of public unsigned, diamond-shaped inheritance
What is the danger of using public unsigned integers within a class?In a diamond-shaped inheritance hierarchy, how to ensure that only 1 copy of parent is created?
redleader
- Apr 16th, 2008
There are at least 2 questions here. The latter is answered but not the former.If the initial question is answered, there would be a requirement to highlight what the dangers are for both public unsigned and multiple inheritance.
ap.genius
- Apr 14th, 2008
Duplicate copies can be avoided using 'virtual' keyword while making ancestral class...The example illustrates it better:#include<iostream.h>#include<conio.h>#include<string.h&g...
-
Polymorphism
What are the issue one should care implementing polymorphism.
redleader
- Apr 16th, 2008
In regards to the point of static and dynamic binding, the virtual keyword needs to be used for any functions that need to be dynamically overriden and not statically overloaded.
redleader
- Apr 16th, 2008
The question revolves around polymorphism, and not the general OOP compliance of the language.Care should be taken in regards to early static binding, and late dynamic binding.Object chopping or slici...
-
C++ palindrome Code
How to check the string in one file is palindrome or not? Print how many strings in that file are palindrome?
king003
- Jun 3rd, 2008
//Ranier De Leon//June 2008#include<iostream>#include<string>#include<cctype>using namespace std;void tryAgain(int);void input();void main(){ input();}void tryAgain...
-
It possible to inherit the private member in drived class?
SomGollakota
- Jun 13th, 2007
Inheritance is one thing, access is quite another. For a C++ class,1. Private members - are off limites to everyone except the ones that are declared in one way or the other, inside the class (direct ...
-
How to create an object for a class that hasa constructor defined under privete access specifier
Prasad2008
- Jun 10th, 2008
There was little error in the code in my previous answer. We have to define a public static member function for this purpose. Here is the codeclass sample{sample* p;sample();public:static s...
Prasad2008
- Jun 10th, 2008
We have to define a public static member function for this purposeclass sample{sample* p;sample();public:static sample genObject();};sample* sample::genObject(){p=new sample;return p;}void main(){sample *p1=sample::genObject();}
-
Hey anybody help me to write code for this programwap which display year,month & day presents in a year for eg.1. no. is 14 print 2 weeks2. no is 90 print 3 months3. no is 365 print 1 yearuser can input any no
chiyuwang
- Jun 20th, 2008
#include <iostream>using namespace std;void CalculateDate(const unsigned int _date);int _tmain(int argc, _TCHAR* argv[]){ unsigned int date; cout<<"...
swetha76
- Sep 27th, 2006
int rem_yr=0,yr=0, n,rem_mon=0,mon=0,rem=0,wek=0;printf(" enter a numbern");scanf("%d",&n); if(n>=365) { yr = n/365; rem_yr =n%365; &n...
-
What is virtual class and friend class?
Friend classes are used when two or more classes are designed to work together and need access to each other's implementation in ways that the rest of the world shouldn't be allowed to have. In other words, they help keep private things private. For instance, it may be desirable for class DatabaseCursor to have more privilege to the internals of class Database than main() has.
sivakumar.v
- Jul 3rd, 2008
Virtual class :: It is an inner class which can be overriden by the derived classes.
SomGollakota
- May 25th, 2008
Answering amarendra.moharana's question.Amarendra, My apologies that it took so long to answer your question. Haven't logged in for quite a while.In class D of your example, you will still hav...
-
What happens to the member function in the class when copy constructor is invoked?
sivakumar.v
- Jul 3rd, 2008
Well, the basic answer is not possible to call copy constructor explicitly within a function again. Because, in the member function it tries to shadow the parameter which is defined at the caller side. Hence, we cannot invoke copy constructor inside a function.
bishoy
- Jan 10th, 2008
Member functions, not as a lot of people expect; have only one instance loaded in memory when the program is run. All constructors included copy constructor target loading member variable, but member functions have their single instances always loaded in memory and ready to be called.
-
Method Overriding
What's the Method Overriding and what's the difference between Method Overloading and Method Overriding.
arun_goel3
- Jul 15th, 2008
Defining a new function with same name but signature is different is known as method oveloading.Define a new function with same name ( as in base class) in derived class is known as method override. In the derived class, base class defined method is hide.
-
What is the dangling pointer in c++
jaihind007
- Jul 15th, 2008
Dangling pointer leads the memory leak problems. The following circumstances are memory leak ( dangling pointers ), not for good programming practice , try to avoid1) Try to avoid the empty object poi...
Ashwan
- Jul 26th, 2007
Dangling Pointer is a pointer pointing to either unallocated memory area or to the area that has already been freed. In simple words, Dangling pointer is the one that points no-where.
-
Advantages of using Pointer
jaihind007
- Jul 15th, 2008
Advantages:* Increasing the programming performance , Using pointers we can able to access the variables faster* Dynamic memory management * Data structure handling (Linkedlist, Stack ,Queue, Data dictionary,....)* File management using FILE pointer
wanttochange
- Jan 10th, 2008
u want advantage 1)can return more then 1 value from a function2)no need to pass the entire object to a function..can pass just the address3)if we want our object to be modify by some function th...
-
Auto Pointer
What is auto pointer ? What is the use of this ?
jaihind007
- Jul 15th, 2008
Auto pointer is nothing but, Proper memory management ( memory Allocation and deallocation).In C++ there is class template "auto_ptr" this is good example for auto pointer. Only we need to a...
vamsip
- May 6th, 2008
1. using printf scanf("%c",&ele); //read charecter printf("ascii= %d",ele); //print it acsii value
-
If a function takes a pointer to a pointer as a parameter, how would you return a new pointer?
Kaushik_khatua
- Jul 22nd, 2008
*testValue = cObj;Dereferencing a double pointer once gives the memory location of the pointer which we need to update.
-
Linking socket++ classes to my application
Hi,Iam very much new to programming and C++please help meI have an application that uses socket++ classes on Unix (AIX) environmentI have included #include in two of my .cpp filesand I have socket++ source in my temp directorywhen iam trying to compile my application using the makefile, the error shown is The #include file "sockinet.h" is not found.I don't know how to make my application to use socket++...
rocky2583
- Jul 19th, 2008
hi,Does the environment variable PATH contain the path of the folder in which the header files are present??If not, then either modify the PATH variable, or use -I option to specify the location of he...
C++ Interview Questions
Ans