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Java: Check whether a number is an Automorphic number or not

Java Numbers: Exercise-14 with Solution

Write a Java program to check whether a number is an automorphic number or not.

In mathematics, an automorphic number is a number whose square "ends" in the same digits as the number itself. For example, 52 = 25, 62 = 36, 762 = 5776, and 8906252 = 793212890625, so 5, 6, 76 and 890625 are all automorphic numbers.

Test Data
Input a number : 76

Pictorial Presentation:

Java: Check whether a number is an Automorphic number or not.

Sample Solution:

Java Code:

import java.util.Scanner;
public class Example14 {

    public static void main(String args[])
       {
        Scanner sc = new Scanner(System.in);
        System.out.print("Input a number : ");
        int num = sc.nextInt();
        int sq_num = num*num;  
 
        String str_num = Integer.toString(num);  
        String square = Integer.toString(sq_num);  
 
        if(square.endsWith(str_num))  
            System.out.println("Automorphic Number.");
        else
            System.out.println("Not an Automorphic Number.");
    }
}

Sample Output:

Input a number : 76                                                                                           
Automorphic Number.

Flowchart:

Flowchart: Check whether a number is an Automorphic number or not

Java Code Editor:

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Next: Write a Java program to check whether a number is a Duck Number or not.

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Java: Tips of the Day

IsPowerOfTwo

Checks if a value is positive power of two.

To understand how it works let's assume we made a call IsPowerOfTwo(4).

As value is greater than 0, so right side of the && operator will be evaluated.

The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.

The result of (value & value) is value. 100 & 100 => 100.

This will value the expression to true as value is equal to value.

public static boolean isPowerOfTwo(final int value) {
    return value > 0 && ((value & (~value + 1)) == value);
}

Ref: https://bit.ly/3sA5d4I

 





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