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Java program for Evil Number
A positive number is an
evil number that has even numbers of 1’s.
For example, 89 is an
evil number as it has four 1’s and its binary equivalence is
1 0 1 1 0 0 1
1 0 1 1 0 0 1
Few evils number are 3,
5, 6, 9, 10, 12, 15, 17, 18, 20
import java.io.*;
/**
* class EvilNumberProgram.
* @author (
Md Anwar)
*/
public class
EvilNumberProgram
{
public static void main(String
args[])throws IOException
{
int num, a, count , c, i;
int binNum[] = new int[20];
InputStreamReader in = new
InputStreamReader(System.in);
BufferedReader br = new
BufferedReader(in);
System.out.println("Enter a number
to check Evil number :");
num = Integer.parseInt(br.readLine());
count = 0; // count the number of 1's
c = 0; // for index of array
while(num!=0)
{
a = num % 2;
binNum[c] = a;
if(a == 1)
count++;
num = num / 2;
c++;
}
System.out.println("Total number
of 1 is = " + count);
// Print the binary number
for(i=c-1; i>=0 ; i--)
{
System.out.print(binNum[i]+"
");
}
// Checking the number is Evil or Not
if(count % 2 == 0)
{
System.out.println("\nEntered
number is Evil an Number");
}
else
{
System.out.println("\nEntered
number is not an Evil Number");
}
}
}
Output:
Enter a number to check
Evil number :
5
Total number of 1 is = 2
1 0 1
Entered number is Evil
an Number
Enter a number to check
Evil number :
9
Total number of 1 is = 2
1 0 0 1
Entered number is Evil
an Number
Enter a number to check
Evil number :
89
Total number of 1 is = 4
1 0 1 1 0 0 1
Entered number is Evil
an Number
Enter a number to check
Evil number :
26
Total number of 1 is = 3
1 1 0 1 0
Entered number is not an
Evil Number
khurshid
Variable Description
Sl.
No.
|
Variable
Name
|
Data
Type
|
Purpose
|
1
|
main()
|
static void
|
Main function
|
2
|
num
|
int
|
To store the number
|
3
|
a
|
int
|
For taking reminder of
num % 2
|
4
|
count
|
int
|
To take total of 1’s
|
5
|
i
|
int
|
For running loop
|
6
|
c
|
int
|
Index of binNum[]
|
7
|
binNum[]
|
int
|
Array of binary number
|
8
|
in
|
Object
|
Object of class InputStreamReader
|
9
|
br
|
Object
|
Object
of class BufferedReader
|
10
|
ch
|
char
|
To extract a single
character inside the loop from the sentence
|
