Aspire Systems Placement Paper - Chennai, July 21, 2016

Aspire Systems Placement Paper - Chennai, July 21, 2016


Interview Questions

Technical Round:

1. What is abstract class?

Abstract cls contains abstract methods and abstract data members, abstract 
methods are methods with out definition. Abstract class can also contain non 
abstract methods ie., method with definition. We cannot create object for 
abstract cls. Abstract cls are inherited by derived classes and they should 
implement all the abstract methods of the inherited abstract class.

2. Why we cant create object for abstract class?

To create an object of any class its mandatory to know that how much memory 
required to load the class so in case of abstract class its can't be 
calculated for abstract members thats why we can't create object of Abstract 
class
An Abstract class is a partial implementation of a class. In other words, at 
least some of the operations or methods are implemented, but the full 
implementation is left up to an inherited class.

Without a full implementation, how could we instantiate the class? What if 
the client was to call one of the abstract (not defined) operations? 
Obviously, this would result in a failure.

3. What is Encapsulation?

Encapsulation is the process of grouping up of datamembers and member 
functions.

4. Give an Example for Encapsulation?

Class encapsulates data member and member function. These function and data 
members are inaccessible to outside environment.

5. Why java does not support multiple inheritances?

1) First reason is ambiguity around Diamond problem, consider a class A has 
foo() method and then B and C derived from A and has there own foo() 
implementation and now class D derive from B and C using multiple 
inheritance and if we refer just foo() compiler will not be able to decide 
which foo() it should invoke. This is also called Diamond problem because 
structure on this inheritance scenario is similar to 4 edge diamond, see 
below


          A foo()
          / \
         /   \
  foo() B     C foo()
         \   /
          \ /
           D
          foo()


2) Multiple inheritances does complicate the design and creates problem 
during casting, constructor chaining etc

6. When finally block will not be executed?

When try or catch block calls System.exit(), then finally block will not be 
executed.
If the jvm exits while the try or catch code is being executed, then the 
finally block may not execute. Likewise, if the thread executing the try or 
catch code is interrupted or killed, the finally block may not execute even 
though the application as a whole continues.

7. Programs: (Reverse the string without using inbuilt function)

void main()
{
char n[10];
int i=0,count=0;
cout<<"Enter the string";
gets(n);
while(n[i]!='\0')
{
count+=count;
n++;
}
while(count>=0)
{
cout<count--;
}
}
output:
SINDHU
UHDNIS

8. Program: (print triangle in following format)

format:
1
2 4
3 6 9
4 8 12 16
5 10 15 20 25

void main()
{
int n,c=1,k;
cout<<"Enter the limit ie the number of rows";
cin>>n; //here n=5;
for(int i=0;i{
k=c;
for(j=0;j<=i;j++)
{
cout<<'\t'<k=k+c;
cout<<'\t';
}
cout<<'\n';
c++;
}
}