ICSE Question Paper – 2018 Computer Applications Class X
SECTION
A (40 Marks)
Answer all questions from this Section
Attempt all questions
Answer all questions from this Section
Attempt all questions
Question 1:
(a) Define abstraction. [2]
Ans. Abstraction refers to the act of representing
essential features without including the background details or explanations.
(b) Differentiate between searching and sorting. [2]
Ans. In searching, an element is a search
from an array, whereas in sorting the array arrange in descending or ascending
order.
2. It basically return a particular
position whereas sorting returns an array with the data arranged in ascending
or descending order.
(c) Write a difference between the
functions isUpperCase() and toUpperCase(). [2]
Ans. Both isUpperCase() and
toUpperCase() are methods of the Character class. In
isUpperCase() accepts a character and
returns true if the provided character is uppercase. Else, it returns false.
Ex:
boolean m = Character.isUpperCase('a');
boolean n = Character.isUpperCase('A');
System.out.println(m + " " +
n);
false true
(d) How are private members of a class different from public members? [2]
Ans. Private members of a class are only
accessible within the in which they are declared. While public members can be
accessible to all and outside of the class.
(e) Classify the following as primitive
or non-primitive data types: [2]
(i) char
(ii) arrays
(iii) int
(iv) classes
Ans. (i) char – Primitive, (ii) arrays –
Non-primitive (iii) int – Primitive (iv) Classes – Non-primitive
Question 2
(a) (i) int res = ‘A’; What is the value of res?(ii) Name the package that contains wrapper classes. [2]
Ans. (i) The output of res will be ASCII
value of ‘A’ which is 65.
(ii) Java.lang package contains the
wrapper class in java programming.
(b) State the difference between while and do-while loop. [2]
Ans. The while is an entry controlled
loop mean the condition of the loop will be checked before the loop is executed
while do-while is an exit controlled loop and it is checked after the loop is
executed.
(c) System.out.print(“BEST “);
System.out.println(“OF LUCK”);
Choose the correct option for the output
of the above statements: [2]
(i) BEST OF LUCK
(ii) BEST
OF LUCK
Ans. (i) is the correct output. It is
because System.out.print() will not print with a new line but
System.out.println(“OF LUCK”) will print with a new line so the output is
BEST OF LUCK
(d) Write the prototype of a function check which takes an integer as an argument and returns a character. [2]
Ans. char check(int x)
(e) Write the return data type of the
following functions: [2]
(i) endsWith()
(ii) log()
Ans. i) boolean ii) double
Question 3
(a) Write a Java expression for the following: [2]√(3x + x2) / (a + b)
Ans. Math.sqrt(3 * x + x*x ) / (a + b)
(b) What is the value of y after
evaluating the expression given below? [2]
y += ++y + y– + –y; when int y = 8.
Ans. 33
y += ++y + y-- + --y
y = 8 + ++y + y-- + --y
y = 8 + 9 + 9 + 7
y = 33
(c) Give the output of the following: [2](i) Math.floor(-4.7)(ii) Math.ceil(3.4) + Math.pow(2, 3)
Ans. i) -5.0 ii) 4.0 + 8.0 = 12.0
(d) Write two characteristics of a
constructor. [2]
Ans. i) A constructor must be the same
name as that of class
ii) It has no return type not even void.
(e) Write the output for the following: [2]System.out.println(“Incredible” + “\n” + “world”);
Ans.
Incredible
World
(f) Convert the following code if to switch..case.
if(var
== 1)
System.out.println("good");
else
if(var == 2)
System.out.println("better");
else
if(var == 3)
System.out.println("best");
else
System.out.println("invalid");
Ans:
switch(var)
{
case 1:
System.out.println("good");
break;
case 2:
System.out.println("better");
break;
case 3:
System.out.println("best");
break;
default:
System.out.println("invalid");
}
(g) Give the output of the following string functions: [2](i) “ACHIEVEMENT”.replace(‘E’, ‘A’)(ii) “DEDICATE”.compareTo(“DEVOTE”)
Ans. i) ACHIAVAMANT ii) Starting first
two characters are same, so the output will be -18, It takes the ASCII values of the
third characters and subtract to get the result.
D – V = 68 – 86 = -18
(h) Consider the following String array and give the output: [2]String arr[] = {"DELHI", "CHENNAI", "MUMBAI", "LUCKNOW", "JAIPUR"};
System.out.println(arr[0].length() >
arr[3].length());
System.out.print(arr[4].substring(0,
3));
Ans. false and JAI
Output is JAI
(i) Rewrite the following using ternary operator: [2]if(bill > 10000) discount = bill * 10.0 / 100;Else discount = bill * 5.0 / 100;
Ans. discount = bill > 10000? (bill *
10.0 / 100) : (bill * 5.0 / 100);
(j) Give the output of the following program segment and also mention how many times the loop is executed: [2]
int i;
for(i = 5; i > 10; i++)
System.out.println(i);
System.out.println(i * 4);
Ans. Here I start with 5 and condition
is i>10 so it is false and the loop will not execute
And for second print option 20 will be
print as i=5, so 5*4 is 20
SECTION
B (60 Marks)
Attempt any four questions from this Section.
The answers in this section should consist of the programs in either BlueJ environment or any program environment with Java as the base.
Each program should be written using Variable descriptions/Mneumonic codes so that the logic of the program is clearly depicted.
Flow-charts and algorithms are not required.
Attempt any four questions from this Section.
The answers in this section should consist of the programs in either BlueJ environment or any program environment with Java as the base.
Each program should be written using Variable descriptions/Mneumonic codes so that the logic of the program is clearly depicted.
Flow-charts and algorithms are not required.
Question 4
String name: to store the name of the customer.
String coach: to store the type of coach customer wants to travel.
long mobno: to store a customer’s mobile number.
int amt: to store the basic amount of ticket.
int totalamt: to store the amount to be paid after updating the original amount.
Methods:
void accept(): to take input for name, coach, mobile number and amount.
void update(): to update the amount as per the coach selected. Extra amount to be added in the amount as follows:
Design a class RailwayTicket with the following description:
Instance variables/data members:String name: to store the name of the customer.
String coach: to store the type of coach customer wants to travel.
long mobno: to store a customer’s mobile number.
int amt: to store the basic amount of ticket.
int totalamt: to store the amount to be paid after updating the original amount.
Methods:
void accept(): to take input for name, coach, mobile number and amount.
void update(): to update the amount as per the coach selected. Extra amount to be added in the amount as follows:
Type of coaches Amount
First_AC 700
Second_AC 500
Third_AC 250
sleeper None
void display(): To display all details of a customer such as a name, coach, total the amount and mobile number.
Write a main() method to create an object of the class and call the above methods.
First_AC 700
Second_AC 500
Third_AC 250
sleeper None
void display(): To display all details of a customer such as a name, coach, total the amount and mobile number.
Write a main() method to create an object of the class and call the above methods.
Answer
import java.util.*;
public class RailwayTicket
{
String name; // to store the
name of the customer
String coach; // to take coach
type
long mobno; // to store mobile
number
int amt; // amount to be
taken
int totalamt; // total amount
with extra
// object of scanner class
Scanner sc = new Scanner(System.in);
// input the detail of the passenger
void accept()
{
System.out.print("Enter name: ");
name = sc.nextLine();
System.out.print("Enter coach: ");
coach = sc.nextLine();
System.out.print("Enter mobno: ");
mobno = sc.nextLong();
System.out.print("Enter amt: ");
amt = sc.nextInt();
}
// update the extra amount
void update()
{
if (coach.equals("First_AC"))
{
totalamt = amt + 700;
}
else if (coach.equals("Second_AC"))
{
totalamt = amt + 500;
}
else if (coach.equals("Third_AC"))
{
totalamt = amt + 250;
}
else if (coach.equals("sleeper"))
{
totalamt = amt;
}
}
// display the detail of the passenger
void display()
{
System.out.println("Name
: " + name);
System.out.println("Coach
: " + coach);
System.out.println("Mobile Number
: " + mobno);
System.out.println("Amount
: " + amt);
System.out.println("Total Amount
: " + totalamt);
}
// main method
public static void main(String args[])
{
// object of RailwayTicket class
RailwayTicket ob = new RailwayTicket();
ob.accept();
ob.update();
ob.display();
}
}
Output:
Enter name: Khurshid
Enter coach: First_AC
Enter mobno: 9199988888
Enter amt: 1567
Name : Khurshid
Coach : First_AC
Mobile Number : 9199988888
Amount : 1567
Total Amount : 2267
Sr. No
|
Variable / Method
|
Type
|
Describe
|
1
|
name
|
String
|
to store the name of the customer
|
2
|
coach
|
String
|
to take coach type
|
3
|
mobno
|
long
|
store customer’s mobile number
|
4
|
amt
|
int
|
to store basic amount of ticket
|
5
|
totalamt
|
int
|
to store the amount to be paid after updating the original
amount
|
6
|
accept()
|
void
|
To accept the detail of the passenger
|
7
|
update()
|
void
|
Update the extra charge for the coach
|
8
|
display()
|
void
|
Display all the detail of the
passenger
|
9
|
main()
|
Static void
|
To call the above methods
|
Question 5
12 = 3 × 4
20 = 4 × 5
42 = 6 × 7
Write a program to input a number and check and print whether it is a Pronic number or not. The pronic number is the number which is the product of two consecutive integers.
Examples:12 = 3 × 4
20 = 4 × 5
42 = 6 × 7
Answer: Click Pronic number
Question 6
Write a program in Java to accept a string in lowercase and change the first letter of every word to uppercase. Display the new string.
Sample INPUT: we are in cyber world
Sample OUTPUT: We Are In Cyber World
Answer
Write a program in Java to accept a string in lowercase and change the first letter of every word to uppercase. Display the new string.
Sample INPUT: we are in cyber world
Sample OUTPUT: We Are In Cyber World
Answer
import
java.util.*;
public
class CapitalizeFirstChar
{
public static void main(String[] args)
{
int I;
char ch;
Scanner sc = new Scanner(System.in);
System.out.print("Enter a
sentence: ");
String st = sc.nextLine();
String capSt = "";
for (i = 0; i < st.length(); i++) {
ch =
st.charAt(i);
if (i == 0 || st.charAt(i - 1) == '
') {
capSt = capSt +
Character.toUpperCase(ch);
} else {
capSt = capSt + ch;
}
}
System.out.println("Capitalize
each word of the sentence : " + capSt);
}
}
Output:
Enter
a sentence: the quick brown dog jumps over a lazy hungary fox
Capitalize
each word of the sentence: The Quick Brown Dog Jumps Over A Lazy Hungary Fox
Sr. No
|
Variable / Method
|
Type
|
Describe
|
1
|
st
|
String
|
to store the sentence in small
characters
|
2
|
capSt
|
String
|
to convert the first character of each
word
|
3
|
sc
|
Scanner object
|
Object of scanner
|
4
|
i
|
int
|
to iterate the loop
|
Question 7
v = 4 / 3 × 22 / 7 × r3
(ii)double volume(double h, double r) – with height ‘h’ and radius ‘r’ as the arguments, returns the volume of a cylinder using the formula:
v = 22 / 7 × r2 × h
(iii) double volume(double l, double b, double h) – with length ‘l’, breadth ‘b’ and height ‘h’ as the arguments, returns the volume of a cuboid using the formula:
v = l × b × h
Design a class to overload a function volume() as follows:
(i) double volume(double r) – with radius ‘r’ as an argument, returns the volume of sphere using the formula:v = 4 / 3 × 22 / 7 × r3
(ii)double volume(double h, double r) – with height ‘h’ and radius ‘r’ as the arguments, returns the volume of a cylinder using the formula:
v = 22 / 7 × r2 × h
(iii) double volume(double l, double b, double h) – with length ‘l’, breadth ‘b’ and height ‘h’ as the arguments, returns the volume of a cuboid using the formula:
v = l × b × h
Answer
//
Volume overloded class
public
class VolumeOverload
{
double vol;
double radius;
double height, length, breadth;
double volume(double r)
{
radius = r;
vol = (4.0 / 3.0) * Math.PI *
Math.pow(radius, 3);
return vol;
}
double volume(double h, double r)
{
radius = r;
double vol = (22.0 / 7) * Math.pow(radius, 2)
* h;
return vol;
}
double volume(double l, double b, double h)
{
length = l;
breadth = b;
height = h;
double vol = length * breadth * height;
return vol;
}
// main method
public static void main(String args[])
{
double vol;
VolumeOverload ob =new
VolumeOverload();
vol = ob.volume(5.0, 6.0);
System.out.println("Volume =
" + vol);
}
}
Question 8
Write a menu-driven program to display the pattern as per user’s choice:
Pattern 1 Pattern 2
ABCDE
ABCD
ABC
AB
A
|
B
LL
UUU
EEEE
J J J J J
|
Answer
import
java.util.*;
public
class PatternMenuProgram
{
public static void main(String[] args)
{
int choice, num, i, j;
String st;
char ch;
Scanner sc = new Scanner(System.in);
System.out.print("Enter pattern
number: ");
choice = sc.nextInt();
switch(choice)
{
// option 1 start
case 1:
System.out.print("Enter number
of lines: ");
num = sc.nextInt();
for (i = num; i >= 1; i--)
{
for ( j = 0; j < i; j++)
{
System.out.print((char)
('A' + j));
}
System.out.println();
}
break; // option 1 end
// option 2 start
case 2:
System.out.print("Enter
string: ");
st = sc.next();
for ( i = 0; i < st.length();
i++)
{
ch = st.charAt(i);
for ( j = 1; j <= (i + 1);
j++)
{
System.out.print(ch);
}
System.out.println();
}
break; // // option 2 end
default:
System.out.println("Wrong
choice");
}
}
}
Output
Enter
pattern number: 1
Enter
number of lines: 5
ABCDE
ABCD
ABC
AB
A
Enter
pattern number: 2
Enter
string: BLUEJ
B
LL
UUU
EEEE
JJJJJ
Question 9
Write a program to accept name and total marks of N number of students in two single subscripts array name[] and totalmarks[].
Calculate
and print:
(i)
The average of the total marks obtained by N number of students. [average =
(sum of total marks of all the students) / N]
(ii)
Deviation of each student’s total marks with the average. [deviation = total
marks of a student – average]
Answer
import
java.util.*;
public
class StudentDeviationProgram
{
public static void main(String[] args)
{
int number; // number of student
int i; // for loop
int sum; // for summation of the numbers
obtained by student
double average; // for avearage calculation
double deviation;// deviation
calculation
sum = 0; // initialize with 0
Scanner sc = new Scanner(System.in);
// Number of students
System.out.print("Enter number of
students: ");
number = sc.nextInt();
// Name array
String[] name = new String[number];
// totalMarks array
int[] totalMarks = new int[number];
// Input name and total matks of
students
for (i = 0; i < number; i++)
{
System.out.println("Student
" + (i + 1));
System.out.print("Input name:
");
name[i] = sc.next();
System.out.print("Input marks:
");
totalMarks[i] = sc.nextInt();
}
// Calculation of sum
for (i = 0; i < number; i++)
{
sum = sum + totalMarks[i];
}
// Calculation of average
average = (double) sum / number;
System.out.println("Average is
" + average);
for (i = 0; i < number; i++)
{
deviation = totalMarks[i] -
average;
System.out.println("Deviation
of " + name[i] + " is " + deviation);
}
}
}
Output
Enter
number of students: 2
Student
1
Input
name: Kamal
Input
marks: 87
Student
2
Input
name: Umesh
Input
marks: 80
Average
is 83.5
Deviation
of Kamal is 3.5
Deviation
of Umesh is -3.5
