Java, C, C++ in Interviews FAQ in Software companies

I am appearing in the Software companies Interviews? Please tell me about the frequently asked Questions on Java, C, C++?

[Arun Vats]

You are asking for the Java, C, C++ in Interviews questions in the Software companies. Here I am providing you list of some frequently asked Interviews in Software companies. These are as follows:

JAVA Interview questions:

What is the purpose of Void class?

What is the base class for Error and Exception

What is mutable object and immutable object?

How will you invoke any external process in Java?

What is a DatabaseMetaData?

How will you load a specific locale?

What is the final keyword denotes?
What is nested class?

C++ Language and JAVA :

1. Difference between C++ and JAVA
2. Object Oriented Concepts(Encapsulation,Polymorphism,inheritance ... )
3. Friend Function,Virtual and Pure Virtual Function
4. Constructors and Destructors
5. Multithreading, Arrays
6. Applets , File I/O Fundamentals
7. Constructor and Function Overloading/Overriding
8. Basic Programs as specified in C language

C Interview questions:

Topics to prepare in C Language 
Data Types , Variable types(Static,Dynamic) , Control statements
Garbage Collection
Functions,Arrays,Pointers(IMPORTANT)
Structures and Union and their difference
File Handling basics
Basic Programs
Prime number or not
Odd number or even number
Fibonacci series
Palindrome,Armstrong no or not , To find Leap year

List of some of the best Frequently asked Questions are as follows:

1) HP acquired this company in 2002. Which is the company

a)Compaq b)Dell c)option 3 d) Option4
Ans: a

2) what does 3G denote
a) 3rd generation mobile communication
b) 3rd generation computer languages
c) option 3
d) option4
Ans: a

3)an application program that is used by the users to get the inofrmation from the backend of some application like databases:
a) application server
b)proxy server
c)database server
d)option 4
Ans: database server

4) which of the following is not true about the e-mail
a) it can be accessed by a client program using POP
b) it can be accessed by a client program using imap protocol
c) option 3
d) option 4
Ans: I don t remember the answer but first 2 are true.

5) Some quesion regarding the company and who developed it ( the thing to remember is that Apple produce Macintosh computers).

6) What is X.25?
a) option 1 b) option 2 c) option 3 d) option 4
Ans: find out??:-)

3. C/C++ Section : Questions on C/C++, Programs O/P Etc.

1) main( )
{
unsigned int i=3;
while( i .=0)
printf( "%d", i--);
}
how many times will the printf stmt be executed?
a)0 b)3 c)4 d) infinite
Ans: I think the answer is infinite, b cos i is an unsigned integer and it will not decrement below 0 and hence end up in an infinite loop.(yes, i checked and it is getting stuck in an infinite loop)

2) main( )
{
int x,y, z;
x=2;
y=5;
z= x+++y;
printf("%d %d %d", x, y z);
}
a) 3 5 7 b) option 2 c) option 3 d) option 4
Ans: a

3) # define swap(a,b) temp=a; a=b; b=temp;
main( )
{
int i, j, temp;
i=5;
j=10;
temp=0;
if( i . j)
swap( i, j );
printf( "%d %d %d", i, j, temp);
}
Ans: On compiling i got ans 10, 0, 0. I did not understand the concept. Please expalin this to me.

4. Java Section: Questions On Java Related stuff.

1) Java was initially code named as:
a) Oak b) green c) miller d) option4
Ans: Oak

2) What is not true about the following statements about java.
a) It is compiled using javac compiler
b) The compiled files have .class extension.
c) Such files cannot be transfered from one comp to another.
d) They use the java interpreter
Ans: c

3) Why is the synchronize used?
a) To initialize multiple objects
b) O lock an object
c) Option3
d) Option 4
Ans: b (probably)