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What is difference between malloc() and calloc() ?
paul.anuj
- Aug 5th, 2008
malloc() and calloc() both are use to allocate memory.malloc takes only one argument that is number of memory bytes, mostly we use sizeof() operator, which allocates the memory of that? number of byt...
baseersd
- Sep 18th, 2007
1) malloc() does not initialize the memory allocated. Hence garbage will be present calloc() initializes the allocated memory with 0.2) malloc() requires 2 arguments in the form of (...
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VTable is same for all objects of class. That means it is stored in memory . Can we obtain the address of VTable without creating any object of class?
jwent
- Aug 14th, 2008
Each instance of a class has its own vtable. Its not a predefined place in memory.
wael.salman
- Jul 30th, 2008
When an object is created, a pointer to this vtable, called the virtual table pointer or vpointer, is added as a hidden member of this object (often the first member). The compiler also generates &quo...
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How do you calculate mode from an array of integers?
OSaienni
- Sep 11th, 2008
Same as above except using arrays. #include <iostream>#include <algorithm>int main() {int arrNums[] = {1,2,4,5,1,3,4,2,3,4}; //find mode average, mode average is most frequently appearing ...
OSaienni
- Sep 11th, 2008
Below is an example program I wrote to find mode average. Mode average is the most frequently occuring number in a set. I haven't handle the case when there are 2 or more values with the same coun...
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The company pays a sales person on a commission basis. The sales person receives $200 per week plus 9 % of their gross salary for that week. For ex. if sales person who grosses 5000$ then he paid $650($200+$450). Write a prog in C++ (using array of counter) that determine how many of the sales person earned salaries in each of following ranges (assume that each sales person salary is truncated to an integer amount) :a. $200-$299 b. $300-$399 so on..i. $1000 and over
google_ever
- Oct 21st, 2008
Int a[8]= {0,0,0,0,0,0,0,0};int b[n]; // Here b is the array of employee's salaries.for(int iLooper=0; iLooper<n; iLooper++) iIndex = ((int)b[iLooper]/100) > 10) ? 8:((int)b[iLooper]/100)-2;a[iIndex]++;
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What is difference between followin intialization.int iVar1;int iVar2 = int();and which one of two should we prefer always and why?
mucdull
- Nov 17th, 2008
int iVar1; // iVar1 is never initializedint iVar2 = int(); // iVar2 will always be initialized with some initial valueThe latter should be used becaus...
Anil
- May 21st, 2007
Dependsif use in main both will get initialize to '0'.ie: global if use inside a function (local) iVar1 will be garbage, iVar2 will be initialised to '0';
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Modular Structered and OOPS
Compare Modular Structered Programming and Object Oriented Programming
mucdull
- Nov 15th, 2008
Modular programming promotes the separation of a program into components called modules. Interfaces act as the logical boundaries between modules which express elements that are provided and...
veerun14
- Sep 25th, 2008
In Modular programming everything is broken down into modules performing a constituent task. Object Oriented programming revolves around a real world object. A Car Object is different from a driver Ob...
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C++ Default Function
What are the four functions that compiler automatically provides? How can you prevent compiler to provide automatically?
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OBJECT and INSTANCE
What Is The Difference Between Object and Instance?
chandrakala Kempapura
- Jun 9th, 2008
If you declare a variable inside the class is called an instance of the variable inside class. Class A{ int x;// instance of the variable}; You can access the same variable/instance though the ob...
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Class X{X(){}X(X &obj){} // supose '=' operator is also overloaded for this class. I am not writing code for that }main(){X a;X b = a;X c(&a);X d;d = a;}What is the difference between a, b, c, d objects ?
burraganesh
- Dec 7th, 2008
For statements Xb =a and X c(a) copy constructor is invoked but with assignment d=a,operator()= is invoked.
swetha
- Feb 20th, 2007
x a; - calls default constructorX b = a; - calls copy constructorX c(a); - calls copy constructorX d; - calls default constructord = a; - calls overloaded = operator.
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Virtual key word
can access any private member of the base class through the derived class FUNCTION IF IT IS VIRTUAL?
burraganesh
- Dec 7th, 2008
No way,Ex:#include<iostream>using namespace std;class base{ private: int a; public: ...
arun_goel3
- Jul 15th, 2008
using typecasting and virtual we can access the private member of base class#include <iostream>using namespace std;class base {int i;virtual void update(int j) {cout << "in base updat...
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Under which conditions compiler provide default constructor to an object when no default constructor is defined in the class definition?
Prasad2008
- Jun 10th, 2008
If the class designer has not provided any constructor within the class, but we are trying to create an object of that class without passing any argument , then compiler will provide a defau...
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# What is an algorithm (in terms of the STL/C++ standard library)?
burraganesh
- Dec 7th, 2008
An algorithm is a way of manipulating container objects data. Simply said it is a special non-member function
ab79
- Nov 14th, 2005
Algorithm in STL consist diffrent searching and sorting algos implementation, which takes start and end iterators of STL containeron which algo is going to work.
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What is namespace?
Namespaces allow us to group a set of global classes, objects and/or functions under a name. To say it somehow, they serve to split the global scope in sub-scopes known as namespaces. The form to use namespaces is: namespace identifier { namespace-body }Where identifier is any valid identifier and namespace-body is the set of classes, objects and functions that are included...
burraganesh
- Dec 7th, 2008
Namespace is simply a name given to a global space, to form a sub-space in global space.
saroj
- Oct 31st, 2007
Minimize?name collision in the global name space, this? namespace?keyword assining a distinict?name?to a libray?to use?the same indentifier names without creating any name collision further name more the? compiler uses the namespce signature for differenting the defn.
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What are proxy objectives
burraganesh
- Dec 7th, 2008
Proxy objects are nothing but objects of proxy class.A proxy class is a class that provides an interface between actual class (implementation) and client.
dasam
- Mar 29th, 2007
A proxy class is a class that implements a list of interfaces specified at compile time. The proxy object typically holds a reference to an internal object that implements the same interfaces (or parts of them).
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C Double dimensional arrays
How can double dimensional arrays be dynamically initialized in C ?
Ajay Kanse
- Dec 23rd, 2008
There are multiple ways to do this :1. int **arr = (int**) malloc(nrows * sizeof(int*)); for (i=0 ; i<nrows ; i++) { arr[i]=(...
SomGollakota
- Jun 13th, 2007
If the question is "How to initialize memory that is dynamically allocated for a 2D array", there are a couple different ways.1. Use memset. memset sets a chunk of memory to a given value. U...
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What is the difference between structures and classes in C++?
There is only one difference ,in classes the members are private by default whereas it is not so in structures.
sripudi
- Jan 5th, 2009
There are a lot of differences between Structure & Class in C.But in C++ the only difference is the members structure are by default public where as class members are by default private.Using C++ structure?we can do the OOPS concepts like inheritance
berezleon
- Dec 1st, 2007
Amid, you are talking about "C" structure that knows nothing about classes etc. The only difference between C++ class and struct is default access specifier (private and public respectively)
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What is structure padding.Describe briefly?
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Write a progarm to enter a spiral matrix?
nidhi.khanna
- Feb 6th, 2009
//SPIRAL MATRIX#includeclass Spiral{public:void sp();};void Spiral::sp(){? int m,n,i,j;int ctr=0,mode=0;int r=0,c=0;int A[30][30];coutn;for(i=0;i
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Explain Legal Function Naming with sample code
burraganesh
- Dec 7th, 2008
$_foo()$ symbol is used by compiler in a process called "name mangling",where each functions name and signature are preceded by $.Thus $ is a valid symbol that a compiler can understand.
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What is the difference between c structure and c++ structure
puneet83
- Mar 30th, 2009
In C++ all the members of a structure are public by default as in case of C.However, C++ structures can contain member functions whereas a structure in C can contain only data.Structure in C++ are sim...
answer
- Oct 12th, 2007
C++ structs are classes with default access as public.C++ structs are typesC++ structs require a ;C++ structs support ctors/dtorsC++ structs support explicit access specificationC++ structs support in...
C++ Interview Questions
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