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ICSE Class 10 Computer Applications Question 19 of 45

Iterative Constructs in Java — Question 20

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20
Question

Question 16

Write a program in Java to read a number and display its digits in the reverse order. For example, if the input number is 2468, then the output should be 8642.

Output:
Enter a number: 2468
Original number: 2468
Reverse number: 8642

import java.util.Scanner;

public class KboatDigitReverse
{
    public static void main(String args[]) {
        
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Number: ");
        int orgNum = in.nextInt();
        
        int copyNum = orgNum;
        int revNum = 0;
        
        while(copyNum != 0) {
            int digit = copyNum % 10;
            copyNum /= 10;
            revNum = revNum * 10 + digit;
        }
        
        System.out.println("Original Number = " + orgNum);
        System.out.println("Reverse Number = " + revNum);
    }
}
Output
BlueJ output of KboatDigitReverse.java
Answer

Source: This question is from Iterative Constructs in Java, Computer Applications — Class 10, ICSE Board.

Key Concepts Covered

This question tests your understanding of the following concepts from the chapter Iterative Constructs in Java: Question, Program, Java, Read, Number, Display. These are fundamental topics in Computer Applications that students are expected to master as part of the ICSE Class 10 curriculum.

A thorough understanding of these concepts will help you answer similar questions confidently in your ICSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Applications papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.

How to Approach This Question

Read the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.

Key Points to Remember

  • Write programs with proper indentation and comments.
  • Trace through your code with sample inputs to verify correctness.
  • Explain the logic behind each step of your solution.
  • Familiarise yourself with common library functions and methods.

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