Question 1

Question 1Write a program to generate the following output.@
@ #
@ # @
@ # @ #
@ # @ # @
public class KboatPattern
{
    public static void main(String args[]) {
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= i; j++) {
                if (j % 2 == 0)
                    System.out.print("# ");
                else
                    System.out.print("@ ");
            }
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 2

Question 2(i)Write a program in Java to display the following patterns.1
2  3
4  5  6
7  8  9  10
11 12 13 14 15
public class KboatPattern
{
    public static void main(String args[]) {
        int a = 1;
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(a++ + "	");
            }
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 3

Question 2(ii)Write a program in Java to display the following patterns.1 * * * *
* 2 * * *
* * 3 * *
* * * 4 *
* * * * 5
public class KboatPattern
{
    public static void main(String args[])  {
        char ch = '*';
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= 5 ; j++) {
                if(i == j)
                    System.out.print(i + " ");
                else
                    System.out.print(ch + " ");
            }
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 4

Question 2(iii)Write a program in Java to display the following patterns.#
* *
# # #
* * * * 
# # # # #
public class KboatPattern
{
    public static void main(String args[])  {
        char ch1 = '#', ch2 = '*';
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= i; j++) {
                if (i % 2 == 0)
                    System.out.print(ch2 + " ");
                else
                    System.out.print(ch1 + " ");
            }
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 5

Question 2(iv)Write a program in Java to display the following patterns.1 * * * *
2 2 * * *
3 3 3 * *
4 4 4 4 *
5 5 5 5 5
public class KboatPattern
{
    public static void main(String args[]) {

for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(i);
            }

for (int k = 1; k <= 5 - i; k++) {
                System.out.print('*');
            }
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 6

Question 2(v)Write a program in Java to display the following patterns.$ $ $ $ 5
$ $ $ 4
$ $ 3
$ 2
1
public class KboatPattern
{
    public static void main(String args[]) {
        char ch = '$';
        for (int i = 5; i >= 1; i--) {
            for (int j = i-1; j >= 1 ; j--)
                    System.out.print(ch + " ");
            System.out.print(i);
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 7

Question 2(vi)Write a program in Java to display the following patterns.A B C D E
A B C D
A B C 
A B 
A
public class KboatPattern
{
    public static void main(String args[])  {
        for (int i = 69; i >= 65; i--) {
            for (int j = 65; j <= i; j++) {
                System.out.print((char)j);
            }
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 8

Question 2(vii)Write a program in Java to display the following patterns.5 4 3 2 1
4 3 2 1
3 2 1
2 1
1
public class KboatPattern
{
    public static void main(String args[]) {
        for (int i = 5; i >= 1; i--) {
            for (int j = i; j >= 1; j--)
                System.out.print( j + " ");
            System.out.println();
        }

}
}Output

Accepted Answer

Please refer to the full solution above.

Question 9

Question 2(viii)Write a program in Java to display the following patterns.I
I C
I C S
I C S E
public class KboatPattern
{
    public static void main(String args[])  {
        String str = "ICSE";
        int len = str.length();
        for(int i = 0; i < len; i++) {
            for(int j = 0; j <= i; j++) {
                System.out.print(str.charAt(j) + " ");
            }
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 10

Question 2(ix)Write a program in Java to display the following patterns.1 2 3 4 5
1 2 3 4
1 2 3
1 2 
1
1 2 
1 2 3
1 2 3 4
1 2 3 4 5
public class KboatPattern
{
    public static void main(String args[])  {
        for(int i = 5; i >= 1; i--) {
            for(int j = 1; j <= i; j++) 
                System.out.print(j + " ");
            System.out.println();
        }
        for(int i = 2; i <= 5; i++) {
            for(int j = 1; j <= i; j++) 
                System.out.print(j + " ");
            System.out.println();
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 11

Question 2(x)Write a program in Java to display the following patterns.1 2 3 4 5
2 3 4 5
3 4 5
4 5 
5 
4 5 
3 4 5 
2 3 4 5
1 2 3 4 5
public class KboatPattern
{
    public static void main(String args[]) {
        
        for (int i = 1; i <= 5; i++)
        {
            for (int j = i; j <= 5; j++) {
                System.out.print(j);
            }
            System.out.println();
        }
        
        for (int k = 1; k <= 4; k++) {
            for (int l = 5 - k; l <= 5; l++) {
                System.out.print(l);
            }
            System.out.println();
        }
        
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 12

Question 3(i)Distinguish between the following:break statement and labelled break statement

Accepted Answer

break statementlabelled break statementThe break statement is used to take the control out of the loop control structure immediately enclosing it.Labelled break statement transfers program control out of the code block whose label is specified as its target.Syntax:break;Syntax:break <label>;For example,for (int i = 1;	i <= 3;	i++){for(int j = 1; j <= 2;	j++){if (i	== 2){break;}System.out.println("Iteration value of inner loop: " + j);}System.out.println();}For example,outer:for (int i = 1;	i <= 3;	i++){for(int j = 1; j <= 2;	j++){if (i	== 2){System.out.println("Terminating the Outer-loop");break outer;}System.out.println("i =" + i +" ; j =" + j);}

Question 13

Question 3(ii)Distinguish between the following:continue statement and labelled continue statement

Accepted Answer

continue statementlabelled continue statementcontinue statement is used to skip the current iteration of a loop and move on to the next iteration.A labelled continue statement skips the current iteration of an outer loop by using a label before the loop and including the same label in continue statement.Syntax:continue;Syntax:continue <label>;For example,for (int i = 0;	i <= 3;	i++){System.out.println("i =" + i);for(int j = 0; j < 3;	j++){if (i	== 2){continue;}System.out.print("j = " + j + " ");}System.out.println();}For example,outerLoop:for (int i = 0;	i <= 3;	i++){for(int j = 0; j < 3;	j++){if (i	== 2){continue outerLoop;System.out.println("i =" + i +" ; j =" + j);}}}

Question 14

Question 4Write a program to print the series given below.8 88 888 8888 88888 888888public class Kboat8Series
{
    public static void main(String args[]) {
        
        for (int i = 1; i <= 6; i++) {
            for (int j = 0; j < i; j++) {
                System.out.print('8');
            }
            System.out.print(' ');
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 15

Question 5(i)What will be the value of sum after each of the following nested loops is executed?int sum = 0;
for (int i = 0; i <= 10; i++)
    for (int j = 0; j <= 10; j++)
        sum += i ;

Accepted Answer

Sum = 605ExplanationThe outer loop executes 11 times. For each iteration of outer loop, the inner loop executes 11 times. For every value of j, i is added to sum 11 times. Consider the following table for the value of sum with each value of i and j.ijSumRemarks00 - 1000 is added to sum 11 times10 - 10111 is added to sum 11 times⇒ 0 + 11 = 1120 - 10332 is added to sum 11 times⇒ 11 + 22 = 3330 - 10663 is added to sum 11 times⇒ 33 + 33 = 6640 - 101104 is added to sum 11 times⇒ 66 + 44 = 11050 - 101655 is added to sum 11 times⇒ 110 + 55 = 16560 - 102316 is added to sum 11 times⇒ 165 + 66 = 23170 - 103087 is added to sum 11 times⇒ 231 + 77 = 30880 - 103968 is added to sum 11 times⇒ 308 + 88 = 39690 - 104959 is added to sum 11 times⇒ 396 + 99 = 495100 - 1060510 is added to sum 11 times⇒ 495 + 110 = 60511  Loop terminates

Question 16

Question 5(ii)What will be the value of sum after each of the following nested loops is executed?int sum = 0;
for (int i = 1; i <= 3; i++)
    for (int j = 1; j <= 3;j++)
        sum = sum + (i + j);

Accepted Answer

Sum = 36ExplanationThe outer loop executes 3 times. For each iteration of outer loop, the inner loop executes 3 times. For every value of j, i + j is added to sum 3 times. Consider the following table for the value of sum with each value of i and j.ijSumsum + (i + j)1120 + 1 + 1 252 + 1 + 2 395 + 1 + 321129 + 2 + 1 21612 + 2 + 2 32116 + 2 + 3312521 + 3 + 1 23025 + 3 + 2 33630 + 3 + 34  Loop terminates

Question 17

Question 6Write a program to generate a triangle or an inverted triangle till n terms based upon the user's choice of triangle to be displayed.Example 1Input:Type 1 for a triangle and type 2 for an inverted triangle1Enter the number of terms5Output:1
2 2
3 3 3
4 4 4 4
5 5 5 5 5
Example 2Input:Type 1 for a triangle and type 2 for an inverted triangle2Enter the number of terms6Output:6 6 6 6 6 6
5 5 5 5 5
4 4 4 4
3 3 3
2 2
1
import java.util.Scanner;

public class KboatPattern
{
    public static void main(String args[]) {
        
        Scanner in = new Scanner(System.in);
        System.out.println("Type 1 for a triangle");
        System.out.println("Type 2 for an inverted triangle");
        
        System.out.print("Enter your choice: ");
        int ch = in.nextInt();
        
        System.out.print("Enter the number of terms: ");
        int n = in.nextInt();
        
        switch (ch) {
            case 1:
            for (int i = 1; i <= n; i++) {
                for (int j = 1; j <= i; j++) {
                    System.out.print(i + " ");
                }
                System.out.println();
            }
            break;
            
            case 2:
            for (int i = n; i > 0; i--) {
                for (int j = 1; j <= i; j++) {
                    System.out.print(i + " ");
                }
                System.out.println();
            }
            break;
            
            default:
            System.out.println("Incorrect Choice");
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 18

Question 7Write a program to compute and display factorials of numbers between p and q where p > 0, q > 0, and p > q.import java.util.Scanner; public class KboatFactRange { public static void main(String args[]) { Scanner in = new Scanner(System.in); System.out.print("Enter p: "); int p = in.nextInt(); System.out.print("Enter q: "); int q = in.nextInt(); if (p > q && p > 0 && q > 0) { for (int i = q; i <= p; i++) { long fact = 1; for (int j = 1; j <= i; j++) fact *= j; System.out.println("Factorial of " + i + " = " + fact); } } else { System.out.println("Invalid Input"); } } }Output

Accepted Answer

Please refer to the full solution above.

Question 19

Question 8Write a program to determine if an entered number is a Happy Number. A happy number is defined by the following process:Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number is equal to 1.For example, 19 is a happy number, as per the following calculation:12 + 92 = 82,82 + 22 = 68,62 + 82 = 100,12 + 02 + 02 = 1import java.util.Scanner;

public class KboatHappyNumber
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter number to check: ");
        long num = in.nextLong();
        long sum = 0;
        long n = num;
        do {
            sum = 0;
            while (n != 0) {
                int d = (int)(n % 10);
                sum += d * d;
                n /= 10;
            }
            n = sum;
        } while (sum > 6);

if (sum == 1) {
            System.out.println(num + " is a Happy Number");
        }
        else {
            System.out.println(num + " is not a Happy Number");
        }
    }
}Output

Accepted Answer

Please refer to the full solution above.

Question 20

Question 9Write a menu driven program that prompts the user to select one of the four triangle patterns (a, b, c, or d). The program then accepts number of rows and prints the selected pattern as shown below:Enter the size : 8(a)# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # (b)# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # (c)# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # (d) # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # import java.util.Scanner; public class KboatTriangleChoice { public static void main(String args[]) { Scanner in = new Scanner(System.in); System.out.println("Type a for Pattern a"); System.out.println("Type b for Pattern b"); System.out.println("Type c for Pattern c"); System.out.println("Type d for Pattern d"); System.out.print("Enter your choice: "); char ch = in.next().charAt(0); System.out.print("Enter the number of terms: "); int n = in.nextInt(); switch (ch) { case 'a': for (int i = 1; i <= n; i++) { for (int j = 1; j <= i; j++) System.out.print('#'); System.out.println(); } break; case 'b': for (int i = n; i >= 1; i--) { for (int j = 1; j <= i; j++) System.out.print('#'); System.out.println(); } break; case 'c': for (int i = n; i >= 1; i--) { for (int j = i; j < n; j++) System.out.print(" "); for (int k = 0; k < i; k++) System.out.print('#'); System.out.println(); } break; case 'd': for (int i = n; i >= 1; i--) { for (int j = 1; j < i; j++) System.out.print(" "); for (int k = i; k <= n; k++) System.out.print('#'); System.out.println(); } break; default: System.out.println("Incorrect choice"); break; } } }Output

Accepted Answer

Please refer to the full solution above.

Nested for loops