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Java Number Programs (ISC Classes 11 / 12)

An Evil number is a positive whole number which has even number of 1's in its binary equivalent. Example: Binary equivalent of 9 is 1001, which contains even number of 1's. A few evil numbers are 3, 5, 6, 9…. Design a program to accept a positive whole number and find the binary equivalent of the number and count the number of 1's in it and display whether it is a Evil number or not with an appropriate message. Output the result in format given below:

Example 1
Input: 15
Binary Equivalent: 1111
No. of 1's: 4
Output: Evil Number

Example 2
Input: 26
Binary Equivalent: 11010
No. of 1's: 3
Output: Not an Evil Number

Java

Java Iterative Stmts

ICSE

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Answer

import java.util.Scanner;

public class KboatEvilNumber
{
     public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a positive number: ");
        int n = in.nextInt();
        if (n < 0) {
            System.out.println("Invalid Input");
            return;
        }
        
        int count = 0;
        int p = 0;
        int binNum = 0;
        
        while (n > 0) {
            int d = n % 2;
            if (d == 1)
                count++;
            binNum += (int)(d * Math.pow(10, p));
            p++;
            n /= 2;
        }
        
        System.out.println("Binary Equivalent: " + binNum);
        System.out.println("No. of 1's: " + count);
        
        if (count % 2 == 0)
            System.out.println("Output: Evil Number");
        else
            System.out.println("Output: Not an Evil Number");
    }
}

Output

BlueJ output of An Evil number is a positive whole number which has even number of 1's in its binary equivalent. Example: Binary equivalent of 9 is 1001, which contains even number of 1's. A few evil numbers are 3, 5, 6, 9…. Design a program to accept a positive whole number and find the binary equivalent of the number and count the number of 1's in it and display whether it is a Evil number or not with an appropriate message. Output the result in format given below: Example 1 Input: 15 Binary Equivalent: 1111 No. of 1's: 4 Output: Evil Number Example 2 Input: 26 Binary Equivalent: 11010 No. of 1's: 3 Output: Not an Evil NumberBlueJ output of An Evil number is a positive whole number which has even number of 1's in its binary equivalent. Example: Binary equivalent of 9 is 1001, which contains even number of 1's. A few evil numbers are 3, 5, 6, 9…. Design a program to accept a positive whole number and find the binary equivalent of the number and count the number of 1's in it and display whether it is a Evil number or not with an appropriate message. Output the result in format given below: Example 1 Input: 15 Binary Equivalent: 1111 No. of 1's: 4 Output: Evil Number Example 2 Input: 26 Binary Equivalent: 11010 No. of 1's: 3 Output: Not an Evil Number

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