ICSE Class 10 COMPUTER APPLICATIONS previous year paper (2018)

(b) What is the value of y after evaluating the expression given below?
             y+= ++y + y– + — y; when int y=8
(c) Give the output of the following:
               (i) Math.floor (-4.7)
               (ii) Math.ceil(3.4) + Math.pow(2, 3)
(d) Write two characteristics of a constructor.
(e) Write the output for the following:
       System.out.println(“Incredible”+”\n”+”world”);
(f) Convert the following if else if construct into 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");

(g) Give the output of the following string functions:
           (i) “ACHIEVEMENT”.replace(‘E’, ‘A’)
           (ii) “DEDICATE”.compareTo(“DEVOTE”)
(h) Consider the following String array and give the output

String arr[]= {"DELHI", "CHENNAI", "MUMBAI", "LUCKNOW", "JAIPUR"};
System.out.println(arr[0].length()> arr[3].length());
System.out.print(arr[4].substring(0,3));

(i) Rewrite the following using ternary operator:

if (bill >10000)
   discount = bill * 10.0/100;
else
   discount = bill * 5.0/100;

(j) Give the output of the following program segment and also mention how many times the loop is executed:

int i;
for ( i = 5 ; i > 10; i ++ )
  System.out.println( i );
System.out.println( i * 4 );

Ans. 
(a) Math. sqrt(3 ∗ x + x ∗ xx)/(a+ b) OR
       Math.sqrt(3*x+Math.pow(x,2))/(a+b);
(b) 33
(c) i. -5.0
      ii. 12.0
(d)(i) Constructors have the same name as that of the class they belong to.
      (ii) Constructors are executed when an object is created.
(e) Incredible
      world
(f) 

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) (i) ACHIAVAMANT
      (ii) -18
(h) (i) false
       (ii) JAI
(i) discount = bill>1000? bill*10.0/100: bill *5.0/100;
(j) Output: 20
       Loop is not executed even once

SECTION B (60 Marks)
Attempt any four questions from this Section

Question 4. [15 marks]

Design a class RailwayTicket with following description:

class	RailwayTicket
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 customer’s mobile number
int amt	To store basic amount of ticket
int totalamt	To store the amount to be paid after updating the original amount
void accept ()	To take input for name, coach, mobile number and amount.
void update ()	To update the amount as per the coach selected
void display ()	To display all details of a customer such as name, coach, total amount and mobile number.

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

import java.util.*;
class RailwayTicket
{
   String name, coach;
   long mobno;
   int amt ,totalamt;
   void accept()
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("enter name , coach and mobile no and amount");
      name=sc.next();
      coach=sc.next();
      mobno=sc.nextLong();
      amt=sc.nextInt(); }
   void update()
   {
       if(coach. equalsIgnoreCase ("First_AC"))
          totalamt=amt+700;
       else if(coach. equalsIgnoreCase ("Second_AC"))
          totalamt=amt+500;
       else if(coach. equalsIgnoreCase ("Third_AC"))
          totalamt=amt+250;
       else
          totalamt=amt;
   }
   void display() {
      System.out.println("name is :"+name);
      System.out.println("mobile no is :"+mobno);
      System.out.println("coach is :"+ coach);
      System.out.println("total amount is :"+totalamt); }
   public static void main (String arg[])
   {
      RailwayTicket ob =new RailwayTicket();
      ob.accept();
      ob.update();
      ob.display(); 
   }
}

Question 5. [15 marks]

Write a program to input a number and check and print whether it is a Pronic number or not. (Pronic number is the number which is the product of two consecutive integers)
     Examples: 12 = 3 × 4
                         20 = 4 × 5
                         42 = 6 × 7
Ans. 

import java.util.*;
class pronic {
   public static void main(String arg[])
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("enter the number");
      int num=sc.nextInt();
      int flag=0;
      for(int i=0;i<num;i++)
      {
        if( i*(i+1)==num)
        {
           flag=1;
           break;
        }
      }
      if(flag==1)
        System.out.println("Pronic number");
      else
        System.out.println("Not a pronic number");
   }
}

Question 6. [15 marks]

Write a program in Java to accept a string in lower case and change the first letter of every word to upper case. Display the new string.
       Sample input: we are in cyber world
       Sample output: We Are In Cyber World
Ans. 

import java.util.*;
class ques6 {
   public static void main(String args[]) {
     Scanner obj= new Scanner(System.in);
     String s="";
     System.out.println(" enter a string");
     String sen=obj.nextLine();
     sen=' ' +sen;
     int l= sen.length();
     for(int x= 0; x<l; x++) {
       char ch= sen.charAt(x);
       if (ch==' ') {
         int i= sen.charAt(x+1);
         i=i-32;
         s= s+ ' '+ (char)i;
         x++; }
      else s=s+ch;}
         System.out.print(s);
  }
}

Question 7. [15 marks]

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
Ans. 

import java .io.*;
public class mensuration
{
   double volume(double R)
   {
      double V= 4.0/3* 22.0/7*Math.pow(R,3);
      return(V);
   }
   double volume( double H,double R)
   {
      double V= 22.0/7 * Math.pow(R,2) *H;
      return(V);
   }
   double volume( double L, double B , double H)
   {
      double V = L*B*H;
      return( V);
   }
}

Question 8. [15 marks]

Write a menu driven program to display the pattern as per user’s choice.
                 Pattern 1                              Pattern 2
                 ABCDE                                  B
                 ABCD                                    LL
                 ABC                                       UUU
                 AB                                          EEEE
                 A
For an incorrect option, an appropriate error message should be displayed.
Ans. 

import java .util.*;
class series
{
   public static void main(String arg[])
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("1.Series1 2.series2");
      System.out.println("enter the choice");
      int choice=sc.nextInt();
      switch(choice)
      {
         case 1:String s="ABCDE";
            for(int i=s.length();i>0;i––)
            {
               System.out.println(s.substring(0,i));
            }
            break;
        case 2 :String s1="BLUE";
          for(int i=0;i<s1.length();i++)
          {
             for(int j=0;j<=i;j++)
             { 
                System.out.print(s1.charAt(i)); }
             System.out.println();
          }
          break;
        default :System.out.println("invalid choice");
      } 
   }
}

Question 9. [15 marks]

Write a program to accept name and total marks of N number of students in two single subscript 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]
Ans. 

import java .io.*;
import java.util.*;
class ques9
{
   public static void main(String aa[])
   {
      Scanner obj = new Scanner(System.in);
      int n;
      System.out.println("enter number of students");
      n= obj.nextInt();
      String name[] = new String[n];
      double marks[] = new double[n];
      double ave, total=0.0;
      for(int x=0; x<n; x++)
      {
         System.out.println(" enter name and totalmarks");
         name[x]= obj.nextLine();
         marks[x]= obj.nextDouble();
         total=total+ marks[x];
      }
      ave= total/n;
      System.out.println("Name " + " " + " Deviation");
      for(int x= 0; x<n;x++)
        System.out.println( (marks[x]–ave));
   }
}