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UTU LEET CS Question paper

1.
(a) Java is both a programming language and a platform. Comment.
(b) what is polymorphism? How does function overloading implement polymorphism?
(c) a _________ constructor create objects through values passed to it.
(d) where can the following members of a class be accessed: private, public protected?
(e) what is an Exception?
[ 2+2+1+3+2 = 10 ]
2.
(a) what is a compound statement? Support with an example.
(b) State one similarity and one difference between while and do while loop.
(c) What is the significance of default clause in a switch statement?
(d) What is the function of operators? What are binary operators?
(e) What is meant by ‘floating constant’ in java?
[ 2+2+2+2+2 = 10 ]
3.
(a) enter any 2 variables through constructor parameters and write a program to swap and print
the values.
(b) What is ‘call by value’ and ‘call by reference’?
(c) Differentiate between if and switch statements.
(d) What is a ‘package’? give an example.
[ 4+2+2+2 = 10 ]
4.
(a) mention any two different styles of expressing a comment in a program.
(b) State the difference between a constructor and a method.
(c) Write a loop that displays numbers 2,4,6,8,..............18,20.
(d) Write an equivalent while loop for the following for loop:
For (int i=2, sum=0; i<=20; i=i+2)
Sum+ = i; [ 2+2+3+3 = 10 ]
SECTION B (60 Marks)
Attempt any four questions from this section. Write all the programs in Java BlueJ environment
and clearly explain the steps using the mnemonics and comments wherever required.
1. Write a program to initialize an array of 5 names and initialize another array with their
respective phone numbers. Search for a name input by the user, in the list. If found, display
“Search Successful” and print the name along with the phone number, otherwise display “Name
not enlisted. Try other names”. [ 15 ]
2. Write a program to find the sum of the series; S = 1 + x + x2 + ............... + xn. [ 15 ]
3. Write a program that doubles every element of an array A [4] [4]. [ 15 ]
4. Write a class with name employee and basic as its data member, to find the gross pay of an
employee for the following allowances and deduction. Use meaningful variables. [15 ]
5. Write a program to generate all Armstrong numbers between 100 and 500. An Armstrong
number is one which is equal to the cubes of each of its digits. E.g. 153 = 13 + 53 + 33. [ 15 ]