To Check odd or even without using modulus operator in java we have different methods . Let’s dicuss these methods step by step.
Method 1. Program to check if the number is odd or even using bitwise (&) operator
We can check any number is odd or even with the help of bitwise & operator. if any number is odd it must have right most bit 1.
example:
int i=5;
binary form i= 0101
now use & operator bitwise operator
int j=i&1;[0101&1]
here j is 0001; so i is odd
Now if i =8 then binary is i=1000 Now j=i&1[1000&1] Here j is 0000 , so i is even
public class CheckEvenOrOdd {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n;
System.out.println("Enter the number :");
n = sc.nextInt();
if (isEven(n) == 0)
System.out.print("Even\n");
else
System.out.print("Odd\n");
}
private static int isEven(int n) {
return n & 1;
}
}Output:
Enter the number :
9
OddMethod 2. Program to check if the number is odd or even by divide and multiply by 2 method
We divide a number by 2 and then multiply by 2 and number is same as input then number is even otherwise odd.
import java.util.Scanner;
public class CheckEvenOrOdd2 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n;
System.out.println("Enter the number :");
n = sc.nextInt();
if (isEven(n))
System.out.print("Even\n");
else
System.out.print("Odd\n");
}
private static boolean isEven(int n) {
return (n/2)*2==n;
}
}Output :
Enter the number :
10
EvenMethod 3. Program to check if the number is odd or even using loop
In this method we will take a flag with value true then switch it n times . If result is true then given number is even otherwise odd.
import java.util.Scanner;
public class CheckEvenOrOdd3 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n;
System.out.println("Enter the number :");
n = sc.nextInt();
if (isEven(n))
System.out.print("Even\n");
else
System.out.print("Odd\n");
}
private static boolean isEven(int n) {
boolean even = true ;
for (int i = 0; i < n ; i++) {
even = !even;
}
return even;
}
}Output:
Enter the number :
10
EvenIn this tutorial we have learned how to check given number is odd or even without using modulus operator in java . you can see more java coding question for interview preparation .