Computer Applications Set 1 2013-2014 (English Medium) ICSE Class 10 Question Paper Solution

Which of the following are valid comments ?

(i) /* comment */
(ii) /* comment
(iii) / / comment
(iv) */ comment */ 

What is meant by a package? 

Name the primitive data type in Java that is:
A 64-bit integer and is used when you need a range of values wider than those provided by int.

Name the primitive data type in Java that is :

A single 16-bit Unicode character whose default value is ‘\u0000’.

State one difference between the floating point literals float and double.

Find the errors in the given program segment and re-write the statements correctly to assign values to an integer array.
int a = new int (5);
for (int i = 0; i < = 5; i++) a [i] = i;

Operators with higher precedence are evaluated before operators with relatively lower precedence. Arrange the operators given below in order of higher precedence to lower precedence.

1. && 
2. % 
3. >= 
4. ++

Identify the statement given below as assignment, increment, method invocation or object creation statement.

System.out.println(“Java”); 

Identify the statement given below as assignment, increment, method invocation or object creation statement.

costPrice = 457.50; 

Identify the statement given below as assignment, increment, method invocation or object creation statement. 

Car hybrid = new Car(); 

Identify the statement given below as assignment, increment, method invocation or object creation statement. 

petrolPrice++;

Give two differences between the switch statement and the If-else statement.

What is an infinite loop ? Write an infinite loop statement.

when is a constructor invoked?

What is meant by a constructor?

List the variables from those given below that are composite data types:

1. static int x;
2. arr[i]=10;
3. obj.display();
4. boolean b;
5. private char chr;
6. String str; 

State the output of the following program segment:
String str1 = “great”; String str2 = “minds”;
System.out.println (str1.substring (0,2).concat(str2.substring (1)));
System.out.println ((“WH”+(str1.substring (2).toUpperCase())));

What are the final values stored in variable x and y below ?
double a = – 6.35;
double b = 14.74;
double x = Math.abs(Math.ceil(a));
double y = Math.rint (Math max (a,b));

Rewrite the following program segment using if-else statements instead of the ternary operator: 
String grade = (mark >= 90) ? “A” : (mark >= 80) ? “B” : “C”;

Give the output of the following method:

public static void main (String [] args)
{
int a = 5;
a++;
System.out.println(a);
a -= (a--) − (--a); 
System.out.println(a);
}

What is the data type returned by the library function?
compareTo()

What is the data type returned by the library function?

equals()

State the value of characteristic and mantissa when the following code is executed:
String s = “4.3756”;
int n = s.indexOf(‘.’);
int characteristic=Integer.parseInt (s.substring (0,n));
int mantissa=Integer.valueOf(s.substring(n+1)); 

Study the method and answer the given questions.
public void sampleMethod()
{ for (int i=0; i < 3; i++)
{ for (int j = 0; j<2; j++)
{int number = (int) (Math.random() * 10);
System.out.println(number); } } }
(i) How many times does the loop execute ?
(ii) What is the range of possible values stored in the variable number ? 

Study the method and answer the given questions.
public void sampleMethod()

{ for (int i=0; i < 3; i++)
{ for (int j = 0; j<2; j++)
{int number = (int) (Math.random() * 10);
System.out.println(number); } } }
(i) How many times does the loop execute ?

(ii) What is the range of possible values stored in the variable number ?

What will be the output when the following code segment is  executed?
String s = “1001”;
int x = Integer. valueOf(s);
double y = Double.valueOf(s);
System.out.println(“x=”+x);
System.out.println(“y=”+y); 

What will be the output when the following code segment is executed?

System.out.println(“The king said\”Begin at the beginning!\“to me.”);

Define a class named movieMagic with the following description:
Instance variables/data members:
int year — to store the year of release of a movie.
String title — to-store the title of the movie

float rating — to store the popularity rating of the movie
(minimum rating=0.0 and maximum rating=5.0)

Member methods:
(i) movieMagic() Default constructor to initialize numeric data members to 0 and String data member to “ ”.
(ii) void accept() To input and store year, title and rating.
(iii) void display() To display the title of a movie and a message based on the rating as per the table below.

Write a main method to create an object of the class and call the above member methods.

A special two-digit number is such that when the sum of its digits is added to the product of its digits, the result is equal to the original two-digit number. Example: Consider the number 59.
Sum of digits = 5 + 9 = 14
Product of its digits = 5 x 9 = 45
Sum of the sum of digits and product of digits = 14 + 45 = 59
Write a program to accept a two-digit number. Add the sum of its digits to the product of its digits. If the value is equal to the number input, output the message “Special 2-digit number” otherwise, output the message “Not a special 2-digit number”

Write a program to assign a full path and file name as given below. Using library functions, extract and output the file path, file name and file extension separately as shown.
Input C: / Users / admin / Pictures / flower.jpg
Output path: C: / Users/admin/Pictures/
File name: flower
Extension: jpg

Design a class to overload a function area( ) as follows:
(i) double area (double a, double b, double c) with three double arguments, returns the area of a scalene triangle using the formula:

area = `sqrt ("s" ("s" - "a")("s" - "b")("s" - "c"))  "2ab"`

where `"s" = ("a" + "b" + "c")/2`

(ii) double area (int a, int b, int height) with three integer arguments, returns the area of a trapezium using the formula:

area = `1/2` height (a+b)

(iii) double area (double diagonal 1, double diagonal 2) with two double arguments, returns the area of a rhombus using the formula :

area = `1/2` (diagonal 1 × diagonal 2)

Using the switch statement, write a menu driven program to calculate the maturity amount of a Bank Deposit.
The user is given the following options :
(i) Term Deposit
(ii) Recurring Deposit

For option (i) accept principal (P), rate of interest(r) and time period m years(n). Calculate and output the maturity amount (A) receivable using the formula

`"A" = "P"[1+"r"/100]^"n"`

For option (ii) accept Monthly Installment (P), rate of interest (r) and time period in months (n). Calculate and output the maturity amount (A) receivable using the formula

`"A" = "P" xx "n" + "P" xx ("n"("n" + 1))/2 xx "r"/100 xx 1/12`

For an incorrect option, an appropriate error message should be displayed.

Write a program to accept the year of graduation from school as an integer value from, the user. Using the Binary Search technique on the sorted array of integers given below. 

Output the message “Record exists” If the value input is located in the array. If not, output the message “Record does not exist”.
{1982, 1987, 1993, 1996. 1999, 2003, 2006, 2007, 2009, 2010}.