difference between abstraction and encapsulation with progarammatic eg.
hi,just recently i went for an interview .The interviewer asked what is the difference between abstraction and encapsulation with programmatic eg.
I gave the answer as
encapsulation mean hiding the relevant data which is not useful for the user, eg a electric fan .hiding the information how the electricity is converted into machanical energy.
abtraction showing only the relevant data to the user eg electric fan.
it look ,its color ,it design etc only relevant data.
Then the interviewer asked me, give me some programmic eg .I Said
Let assume a web form having control like textbox,button etc.
The user can view textbox,button etc this is the eg of abstraction
and when the user click on the button how he is redirected is not known by the user is the eg of the encapsulation.
Am I Correct .was the answer given by me is perfect .now i am planing to go for an another interview should i give the same answer.IF not please suggest me a better answer.with some good eg Please help
what is the abstract class,interface ,its difference with a programatic eg.?
hi,recently i went for an interview they ask me what is abstract class ,interface and its difference
I said abstract class contain abstact method ,abstract method is a method with no body.Abstract class cannot be instantiated.Abstract class is a base class it required derived class for the implementation of method.
Interface is a syntactical contract that all derived class should follow
it define properties ,method,events which are known as member of interface.
Then They asked me what is the difference between them. I said
abstract class interface
1.abstact class can implement method 1.interface cant
2.abstact class can contain constructor, 2.interface cant
destructor
3.abstract class cannot support multiple 3.interface support
inheritance
etc
Then they said some different answer I said dont no.
Then they ask me when i should make abstract class for an project and when
i should make interface.
I said if suppose there is two class which must be having method with different logic then we sholud make abstract class.
and if suppose we have two class having method .with different logic then we can make interface .
Am i correct with my explaination.if not correct me .please provide me that when should we create abstract class and interface and what is difference .please help me
What is the use of unnamed namespaces in OOPS?
The only advantage I know is that they dont need the scope
resolution operator while accessing them. I want to know
some other advantages of unnamed namespaces...
They started with the brief introduction followed by few
basic C++ questions on polumorphism, inheritance and then
virtual functions.
What is polymorphims?
How you will access polymorphic functions in C?
How virtual function mechanism works?
117
2. Give the different notations for the class.\
157
what is graphics
147
why we are declare the function in the abstract class even
though we are declaring it in Derived class?
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
void select(char *items, int count);
int main(void)
{
char s[255];
printf("Enter a string:");
gets(s);
select(s, strlen(s));
printf("The sorted string is: %s.\n", s);
getch();
return 0;
}
void select(char *items, int count)
{
register int a, b, c;
int exchange;
char t;
for(a = 0; a < count-1; ++a)
{
exchange = 0;
c = a;
t = items[ a ];
for(b = a + 1; b < count; ++b)
{
if(items[ b ] < t)
{
c = b;
t = items[ b ];
exchange = 1;
}
}
if(exchange)
{
items[ c ] = items[ a ];
items[ a ] = t;
}
}
}
design an algorithm for Selection Sort
21
class CTest
{
public:
void someMethod()
{
int nCount = 0;
cout << "This is some method --> " << nCount;
}
};
int main()
{
CTest *pctest;
pctest->someMethod();
return 0;
}
It will executes the someMethod() and displays the value
too. how is it possible with our creating memory for the
class . i think iam not creating object for the class.
Thanks in Advance...
Prakash
155
Why is it so that we can have virtual constructors but we
cannot have virtual destructors?
685
write a program to enter a string like"sunil is a good boy
and seeking for a job" not more than 10 characters including
space in one line,rest characters should b in other line.if
the next line starts from in between the previous word,then
print whole word to next line.
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