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What is the difference betwen wait() and delay()?
yzesong
- Aug 1st, 2009
In a proces which issues wait( ) will suspend itself until either a certain process terminated(wait(n), n is PID) or all process terminated (wait()). Delay is like pausing for a certain period of time, same as sleep( ).
3bu1
- Aug 21st, 2007
Wait()....event triggereddelay()....time trigerred
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Why cann't we overload the sizeof, :?, :: ., .* operators in c++
yzesong
- Jul 31st, 2009
In order to avoid operator ambiguity , :?, ::, . operators are not overloaded.?
Amritanshu Agrawal
- Sep 5th, 2006
Hi all,Firstof all only .,:: and .* operators never be overladed.Because They take name, rather than a value,as their socound operand and provide the primary means of reffering to members.Allowing them to be overloaded would lead to subtlety.
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Is there any way to write a class such that no class can be inherited from it. Please include code
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Do Nothing Constructor
What are Default Constructor and Do Nothing Constructor
yzesong
- Jul 30th, 2009
I think Do nothing constructor is the one OS offered, which has no argument in it, of course no return type. The default constructor has the same signature as DO nothing constructor, but you can write...
inspirevinchi
- May 16th, 2009
Constructor with no arguments or arguments with default value are called default constructor.
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What is the difference between static global variable and static local variable?
yzesong
- Jul 31st, 2009
They have almost same lifetime(local is shorter), but different access scope.
burraganesh
- Dec 7th, 2008
For both these the default initial value is 0A static global variable can only be accessed in the file it exists, we cannot use it in other files, even after mentioning it as externIn static local var...
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Default Parameter
What is default parameter? Can a overloaded function have a default parameter?
yzesong
- Jul 29th, 2009
This is my answer, please correct me if I am wrong.Overloading functions with default parameters will cause compile error for ambiguous calling on the overloaded function. But it really depends ...
amarnathsatrawala
- Jun 16th, 2009
The overloads may not always be banned. The compiler could remove the parameter with default values for the overload resolution. e.g. The signature of the fuction after removing the default parameters...
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Data Encapsulation
Which one of the statements concerning data encapsulation is FALSE? A. Data encapsulation lets the programmer create an object and then provide an interface that other objects can use to invoke the methods provided by that object. B. Programmers can change the internal working of an object, but this may be transparent as long as the interface remains unchanged. C. Data encapsulation works well for...
tewari2312
- Jun 13th, 2009
E is false, because encapsulation decreases the complexity of the program (encapsulation is to wrap data and associated functions into a single unit called class)
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While copying the objects if we say X a=b, X a(b) What will it call, assignment operator or copy constructor? Justify
lddung19720603
- Jul 28th, 2009
In both cases the copy constructor will be called. If we have a=b alone, then the assignment operator will be called.
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C++ File Stream
What is the concept of file stream in C++? How is a file opened and closed in C++?
Peter_APIIT
- Jul 17th, 2009
File stream are opened when default constructor was called and closed during destructor called.
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Execute Destructor
When is a destructor executed?
newlife
- Jul 4th, 2009
It is called automatically whenever life of object ended. we need not to call it separtely.
yudhisthira_attry
- Dec 4th, 2008
When object goes out of scope or if you delete the object which is created by new operator on heap.
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Length Conversion Program
Write a program that will read in a length in feet and inches and will output the equivalent length in meters and centimeter. Use at least three functions: one for input, one or more for calculating, and one for output. Include a loop that lets the user repeat this computation for new input values until the user says he wants to end the program. There are meter in a foot, 100 centimeters in a meter,...
javierisassi
- Jul 1st, 2009
#include "iostream"using namespace std;struct metric{ int meters; int centimeters;};struct english{ int feet; int inches;};void input( english &value ) { std::cout << "Type ze...
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Deallocation of memory
When we allocates the memory using malloc() and calloc(), it returns pointer pointing to the base address to the allocated memory. But while freeing the memory we call free(pointer) thenHow the operation system knows that how much memory is about to be free.
amarnathsatrawala
- Jun 16th, 2009
Dynamic memory is allocated on heap. De-allocation is counterpart of the allocation operation. the task of allocation and De-allocation is handled by the base/standard libraries. These store infor...
tewari2312
- Jun 13th, 2009
Should have used the term compiler rather than OS, when we use these functions a pointer is formed pointing to the location of the base address of the allocated memory and when the value is assigned a...
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For Polymorphism, which technique is a perfect example in C++?1. Function / Operator Overloading2. Virtual Functions3. Template
VENKATGOPU
- Jun 10th, 2009
For Compile time polymorphism, Function/Operator overloading are good exampleFor Run time polymorphism, Virtual Function is good example.
puneet83
- Mar 30th, 2009
Polymorphism in C++ is broadly classified as :1. Compile time Polymorphism eg. Operator/Funtion Overloading2. Run time polymorphism eg. Virtual functions.Compile time polymorphism is compartively fast...
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Explain why encapsulation is required?
Niranjan.ambati
- May 8th, 2009
Encpasulation is the process of packaging the classes into the public interfaces and private implementation,?so that, any changes in the code will not?effect the implmentation. The interfaces?shoul...
r v p
- May 7th, 2008
Encapsulation is an OOP principle of placing the data and functionality within a single entity. This is so that all the functions that access the internal representation of the data type must be part of the data type definition.
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What does this function do:
What does this function do:string f(const string &x) { return x.empty()? x : f(x.substr(1)) + x[0];}What does this piece of code perform:char *a=...., *b=....;while(*b++ = *a++);
shantanu_hbd
- Apr 25th, 2009
Second function is copying 'a' to 'b' provided that 'a' should be a null terminated string.
santhosh.kanchanapally
- Feb 17th, 2009
Char *a="hai", *b="san";while(*b++ = *a++);This program leads to crash, as we are assigning one memory location to other memory location.
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Explain the need for "Virtual Destructor".
Niranjan.ambati
- Apr 9th, 2009
Virtual destructor makes sure that all derived objects are deleted first before deleting the base class objects. When base class pointer assigned with Derived class objects, the virtual destructor of ...
jezpops
- Jul 7th, 2008
Virtual destructor is used when deleting an object explicitly using the delete[] keyword. The Virtual destructor ensures that derived classes take on the implicit destructor method.
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What is the difference between parameter and argument?
sanjayojha02
- Apr 8th, 2009
The values we are passing at the time of calling a function are called arguments.and the values that get received in some variable during function call are called parameters.
vinayak singh
- Dec 24th, 2008
A parameter represents a value that the procedure expects you to pass when you call it. The procedure's declaration defines its parameters.An argument represents the value you pass to a procedure ...
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What is the difference between realloc() and free()
cshaw
- Mar 31st, 2009
The free subroutine frees a block of memory previously allocated by the malloc subroutine. Undefined results occur if the Pointer parameter is not a valid pointer. If the Pointer parameter is a null v...
dasam
- Mar 29th, 2007
The realloc() function changes the size of the memory object pointed to by ptr to the size specified by sizefree() function deallocates the block of memory previously allocated using a call to malloc, calloc or realloc, making it availbale again for further allocations.
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Whar are C++ Template strength and weekness 5 items
puneet83
- Mar 30th, 2009
Templates are best used when the logic applied on a data is independent of the data type. eg. performing Swap of 2 data items, these data items can be of type in, double, class objects etc.But the ope...
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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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