COMPUTER SCIENCE PRACTICAL SOLVED QUESTIONS - ISC BOARD 2018

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QUESTION -1
A Goldbach number is a positive even integer that can be expressed as the sum of two odd primes.
Note: All even integer numbers greater than 4 are Goldbach numbers. Example: 6 = 3 + 3
10 = 3 + 7
10 = 5 + 5
Hence, 6 has one odd prime pair 3 and 3. Similarly, 10 has two odd prime pairs, i.e. 3 and 7, 5 and 5.
Write a program to accept an even integer ‘N’ where N > 9 and N < 50. Find all the odd prime pairs whose sum is equal to the number ‘N’.
Test your program with the following data and some random data: Example 1:
INPUT: N = 14
OUTPUT: PRIME PAIRS ARE:
3, 11
7, 7
Example 2: INPUT: N = 30
OUTPUT: PRIME PAIRS ARE
7, 23
11, 19
13, 17
Example 3: INPUT: N = 17
OUTPUT: INVALID INPUT. NUMBER IS ODD.
Example 4: INPUT: N = 126
OUTPUT: INVALID INPUT. NUMBER OUT OF RANGE.

import java.util.*;
public class Goldbach
{
    boolean isPrime(int n)
    {
        if(n<=1)        //All numbers that are less than or equal to one are  non-prime
            return false;

        int i;
        for(i=2;i<=n/2;i++)
        {
            if(n%i==0)  //If any number between 2 and n/2 divides n then n is non prime
                return false;
        }
        /*If any return statement is encountered it terminates the function immediately
         * therefore the control will come here only when the above return statements are not executed 
         * which can happen only when the number is a prime number.
         */
        return true;
    }
    
    void print(int n)
    {
        int i, j;
        for(i=2;i<=n;i++)
        {
            for(j=i;j<=n;j++)
            {
                //If i and j are both prime and i+j is equal to n then i and j will be printed
                if(isPrime(i)&&isPrime(j)&&i+j==n)
                System.out.println(i+", "+j);
            }
        }
    }
    public static void main()
    {
        Scanner sc = new Scanner(System.in);
        int n;
        System.out.println("Enter the limit: ");
        n = sc.nextInt();
        if(n%2==1)
        {       //Checking for invalid input and terminating the program
            System.out.println("INVALID INPUT. NUMBER IS ODD.");
            System.exit(0);
        }
        if(n<=9||n>=50)
        {       //Checking for 2nd invalid input and terminating the program
            System.out.println("INVALID INPUT. NUMBER OUT OF RANGE.");
            System.exit(0);
        }
        Goldbach ob = new Goldbach();       //Creating object
        System.out.println("Prime Pairs are: ");
        ob.print(n);
    }
}
-----------------------------------*-----------------------------------
QUESTION -2
Write a program to declare a matrix A[ ] [ ] of order (M xN) where ‘M’ is the number of rows and ‘N’ is the number of columns such that the values of both ‘M’ and ‘N’ must be greater than 2 and less than 10. Allow the user to input integers into this matrix. Perform the following tasks on the matrix:
(a) Display the original matrix.
(b) Sort each row of the matrix in ascending order using any standard sorting technique.
(c) Display the changed matrix after sorting each row. Test your program for the following data and some random data: Example 1:

INPUT:
M = 4
N = 3
Example 2:
INPUT:
M = 3
N =3
Example 3:
INPUT:
M = 11
N = 5
OUTPUT:
MATRIX SIZE OUT OF RANGE
import java.util.*;
public class TwoDArr
{
    void sort(int a[])      //Taking  single dimension array as parameter
    {
        int i, j, n = a.length, tmp;        //a.length gives the number of values in the 1D array
        for(i=0;i<n;i++)
        {
            for(j=0;j<n-1-i;j++)            //Sorting using bubble sort technique
            {
                if(a[j]>a[j+1])
                {
                    tmp = a[j];
                    a[j] = a[j+1];
                    a[j+1] = tmp;
                }
            }
        }
    }

    void display(int a[][])     //Taking 2D array as parameter
    {
        int i, j;
        for(i=0;i<a.length;i++)     //a.length here gives the number of rows
        {
            for(j=0;j<a[i].length;j++)  //a[i] gives one row at a time. a[i].length gives the number of values in each row
            {
                System.out.print(a[i][j]+"\t");
            }
            System.out.println();
        }
    }

    void sort2D(int a[][])
    {       //As arrays are reference data types any changes made to the formal parameter in this function.
        //Will be reflected in the original parameter.
        int i, j;
        for(i=0;i<a.length;i++)
        {
            sort(a[i]);     //Taking each row and passing each to sort function as a single dimension array
        }
    }

    public static void main()
    {
        Scanner sc = new Scanner(System.in);
        TwoDArr obj = new TwoDArr();
        int a[][], m, n, i, j;
        System.out.println("Enter the number of rows: ");
        m = sc.nextInt();       //Input the size
        System.out.println("Enter the number of columns: ");
        n = sc.nextInt();
        if(m<3||m>9||n<3||n>9)
        {
            System.out.println("Matrix out of range");
            System.exit(0);     //Terminating the program
        }
        a = new int[m][n];      //Allocating memory
        System.out.println("Enter the values for the matrix: ");
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                a[i][j] = sc.nextInt();
            }
        }
        System.out.println("Original Matrix: ");
        obj.display(a);     //Displaying array before sorting
        obj.sort2D(a);      //Calling sort function
        System.out.println("Matrix after sorting rows: ");
        obj.display(a);     //Display after sort function has executed
    }
}
-----------------------------------*-----------------------------------

QUESTION -3

The names of the teams participating in a competition should be displayed on a banner vertically, to accommodate as many teams as possible in a single banner. Design a program to accept the names of N teams, where 2 < N < 9 and display them in vertical order, side by side with a horizontal tab (i.e. eight spaces).
Test your program for the following data and some random data:
Example 1:
INPUT: N = 3
Team 1: Emus
Team 2: Road Rols
Team 3: Coyote
OUTPUT:

import java.util.*;
public class ISC2018Q3
{
    public static void main()
    {
        Scanner sc = new Scanner(System.in);
        String ar[];
        int n, i, j;
        System.out.println("Enter the number of names: ");
        n = sc.nextInt();
        ar = new String[n];
        System.out.println("Enter the names: ");
        for(i=0;i<n;i++)
        {
            ar[i] = sc.nextLine();
        }
        int max = 0;

        for(i=0;i<n;i++)
        {
            if(max<ar[i].length())
            max = ar[i].length();       //Finding the length of the string
        }
        System.out.println("OUTPUT:" );
        for(i=0;i<max;i++)
        {
            for(j=0;j<n;j++)
            {
                /*character will be extracted only when i has a value less
                 * than the length of the string else only tabular space will be printed
                 */ 
                if(i<ar[j].length())
                    System.out.print(ar[j].charAt(i)+"\t");
                else
                    System.out.print("\t");
            }
            System.out.println();
        }
    }
}


Comments

  1. Unknown11 February 2019 at 03:55

    wow

    ReplyDelete
  2. Unknown11 February 2019 at 19:50

    Great:)

    ReplyDelete
  3. Unknown11 February 2019 at 22:57

    awesome man!!!!!!!!!!

    ReplyDelete
  4. Unknown12 February 2019 at 06:37

    thanku soo much for ur help!!!

    ReplyDelete
  5. Dheeresh Babji12 February 2019 at 09:17

    ohhhh!!!!!!!!

    ReplyDelete
  6. Unknown12 February 2019 at 10:02

    This helped me a lot.

    ReplyDelete
  7. Unknown12 February 2019 at 11:50

    Thanx a lot

    ReplyDelete
  8. Aayush12 February 2019 at 17:05

    Fine

    ReplyDelete
  9. Unknown19 February 2019 at 04:37

    Thanks

    ReplyDelete
  10. Unknown9 June 2019 at 09:52

    Thank you so much for your help :)

    ReplyDelete
  11. Anonymous12 June 2019 at 22:51

    Sir,there is a mistake in question no. 3,whe we are entering the value of n the program is getting printed only for 2 string value, so if we use the statement n=sc.nextInt()+1; thuis statement will let the program to get the exact output,so kindly change the program

    ReplyDelete
  12. Unknown8 October 2019 at 22:12

    Yes I agree with you ..u r correct...

    ReplyDelete
  13. alex11 April 2020 at 03:25

    Great post.
    https://knowyourmeme.com/users/josephlowe

    ReplyDelete
  14. alex27 April 2020 at 02:49

    Great post.
    https://www.codecademy.com/profiles/larrywagner6140001425

    ReplyDelete
  15. Smarto Chowdhury13 February 2021 at 02:40

    Very Much Helpful
    Thanks a lot

    ReplyDelete
  16. enigma7 March 2021 at 09:23

    thank u

    ReplyDelete
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