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Nested for loops Solutions - Computer Applications Class 9 ICSE - Nested for loops | Computer Applications Class 9 ICSE | Bright Tutorials

Nested for loops

Solutions for Computer Applications, Class 9, ICSE

Assignment Questions

17 questions

Question 1

Write a program to generate the following output.

*
* #
* # *
* # * #
* # * # *

Assignment Questions

Answer:

public class KboatPattern
{
    public static void main() {
        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

BlueJ output of KboatPattern.java

Question 2

Write a program to print the series given below.

5 55 555 5555 55555 555555

Assignment Questions

Answer:

public class Kboat5Series
{
    public static void main(String args[]) {
        
        for (int i = 1; i <= 6; i++) {
            for (int j = 0; j < i; j++) {
                System.out.print('5');
            }
            System.out.print(' ');
        }
    }
}

Output

BlueJ output of Kboat5Series.java

Question 3(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

Assignment Questions

Answer:

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++ + "\t");
            }
            System.out.println();
        }
    }
}

Output

BlueJ output of KboatPattern.java

Question 3(ii)

Write a program in Java to display the following patterns.

1 * * * *
* 2 * * *
* * 3 * *
* * * 4 *
* * * * 5

Assignment Questions

Answer:

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

BlueJ output of KboatPattern.java

Question 3(iii)

Write a program in Java to display the following patterns.

#
* *
# # #
* * * * 
# # # # #

Assignment Questions

Answer:

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

BlueJ output of KboatPattern.java

Question 3(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

Assignment Questions

Answer:

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

BlueJ output of KboatPattern.java

Question 3(v)

Write a program in Java to display the following patterns.

* * * * 5
* * * 4
* * 3
* 2
1

Assignment Questions

Answer:

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

BlueJ output of KboatPattern.java

Question 3(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

Assignment Questions

Answer:

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

BlueJ output of KboatPattern.java

Question 3(vii)

Write a program in Java to display the following patterns.

Assignment Questions

Answer:

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

BlueJ output of KboatPattern.java

Question 3(viii)

Write a program in Java to display the following patterns.

J
J A 
J A V
J A V A

Assignment Questions

Answer:

public class KboatPattern
{
    public static void main(String args[])  {
        String str = "JAVA";
        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

BlueJ output of KboatPattern.java

Question 3(ix)

Write a program in Java to display the following patterns.

Assignment Questions

Answer:

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

BlueJ output of KboatPattern.java

Question 3(x)

Write a program in Java to display the following patterns.

Assignment Questions

Answer:

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("  ");
            }
            for (int k = i; k <= 5; k++) {
                System.out.print(k + " ");
            }
            System.out.println();                  
        }
        for(int i = 4; i >= 1 ; i--) {
            for (int j = 1; j < i; j++) {
                System.out.print("  ");
            }
            for (int k = i; k <= 5; k++) {
                System.out.print(k + " ");
            }
            System.out.println();                  
        }
    }
}

Output

BlueJ output of KboatPattern.java

Question 4(i)

Distinguish between the following:

break statement and labelled break statement

Assignment Questions

Answer:

break statement	labelled break statement
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 4(ii)

Distinguish between the following:

continue statement and labelled continue statement

Assignment Questions

Answer:

continue statement	labelled continue statement
continue 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 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;

Assignment Questions

Answer:

Sum = 605

Explanation

The 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.

i	j	Sum	Remarks
0	0 - 10	0	0 is added to sum 11 times
1	0 - 10	11	1 is added to sum 11 times ⇒ 0 + 11 = 11
2	0 - 10	33	2 is added to sum 11 times ⇒ 11 + 22 = 33
3	0 - 10	66	3 is added to sum 11 times ⇒ 33 + 33 = 66
4	0 - 10	110	4 is added to sum 11 times ⇒ 66 + 44 = 110
5	0 - 10	165	5 is added to sum 11 times ⇒ 110 + 55 = 165
6	0 - 10	231	6 is added to sum 11 times ⇒ 165 + 66 = 231
7	0 - 10	308	7 is added to sum 11 times ⇒ 231 + 77 = 308
8	0 - 10	396	8 is added to sum 11 times ⇒ 308 + 88 = 396
9	0 - 10	495	9 is added to sum 11 times ⇒ 396 + 99 = 495
10	0 - 10	605	10 is added to sum 11 times ⇒ 495 + 110 = 605
11			Loop terminates

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);

Assignment Questions

Answer:

Sum = 36

Explanation

The 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.

i	j	Sum	sum + (i + j)
1	1	2	0 + 1 + 1
	2	5	2 + 1 + 2
	3	9	5 + 1 + 3
2	1	12	9 + 2 + 1
	2	16	12 + 2 + 2
	3	21	16 + 2 + 3
3	1	25	21 + 3 + 1
	2	30	25 + 3 + 2
	3	36	30 + 3 + 3
4			Loop terminates

Question 6

Write 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 1
Input:
Type 1 for a triangle and type 2 for an inverted triangle
1
Enter the number of terms
5
Output:

Example 2
Input:
Type 1 for a triangle and type 2 for an inverted triangle
2
Enter the number of terms
6
Output:

6 6 6 6 6 6
5 5 5 5 5
4 4 4 4
3 3 3
2 2
1

Assignment Questions

Answer:

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

BlueJ output of KboatPattern.java

BlueJ output of KboatPattern.java