To check Even or Odd we go through the checking of number that number is divisible by 2 or not if given number is divisible by 2 then we say that the given number is Even otherwise it is odd.
Before going to actual program lets see how to check a number is even or odd by using modulus and division operators.
Here, we will see the basic idea of checking even or odd.
Program #1 (By Using Modulus Opertaor)
import
java.util.Scanner;
public class EvenOrOdd
{
public static void
main(String[] args) {
int number;
System.out.println("Enter a number to check even or odd");
number
= new Scanner(System.in).nextInt();
if
((number % 2) == 0) {
System.out.println(+number
+ " is Even number");
} else
{
System.out.println(+number
+ " is Odd Number");
}
}
}
Output:
Enter a number to check even or odd
20
20 is Even number
Press any key to continue . . .
Program #2(By Using Division Operator )
import java.util.Scanner;
public class EvenOrOdd {
public static void main(String[] args) {
int number;
System.out.println("Enter a number to check even or odd");
number = new
Scanner(System.in).nextInt();
if ((number / 2) * 2 == number) {
System.out.println(+number + " is Even number");
} else
{
System.out.println(+number + " is Odd Number");
}
}
}
Output:
Enter a number to check even or odd
23
23 is Odd Number
Press any key to continue . . .
So form above we see that we have used the modulus(%) and division(/) operator to check the even and odd number. let see the other ways where we will not use the modulus(%) or division(/) operators to check Even or Odd number.
1) By using Shift Operator
2) By using Bitwise Operator
Program #3 (By using Shift Operator)
uses of shift operator can be alternative of checking the given number is even or odd.in this process we will follow the below steps.
Step 1: Take the number and perform the right shift on it one time.
Ex: 2 >> 1 =1
Here 2 means 010 and when we apply right shift once then it will become 001 which means number becomes 1.
Step 2: Now again apply the left shift once on this number which is 1 means (001) we will get 2.
Ex: 1 << 1 =2
Step 3: check this number with actual number if number is same then it will be even otherwise odd number.
import
java.util.Scanner;
public class EvenOrOdd
{
public static void
main(String[] args) {
int number;
System.out.println("Enter a number to check even or odd");
number
= new Scanner(System.in).nextInt();
if
((number >> 1) << 1 == number) {
System.out.println(+number
+ " is Even number");
} else
{
System.out.println(+number
+ " is Odd Number");
}
}
}
Output
Enter a number to check even or odd
33
33 is Odd Number
Press any key to continue . . .
Enter a number to check even or
odd
32
32 is Even number
Press any key to continue . . .
Program #4 (By using Bitwise Operator)
Here we are going to use Bitwise operators like & and | .this operator works like ,it compare the bit by bit of numbers.here we are going to compare each number with 1 by using bitwise & and | if it will give 0 then number is Even and if its gives other then number is Odd.
Lets see how Bitwise operator works.
- AND : 1 & 1=1
- OR : 0 | 1= 1 , 1 | 0=1 , 1| 1= 1
- XOR : 0 ^ 1= 1 , 1^ 0=1
- NOT : !0=1
Truth Table for Bitwise operators (AND,OR ,XOR,NOT)
|
A
|
B
|
A&B
|
A|B
|
A^B
|
~A
|
|
0
|
0
|
0
|
0
|
0
|
1
|
|
0
|
1
|
0
|
1
|
1
|
1
|
|
1
|
0
|
0
|
1
|
1
|
0
|
|
1
|
1
|
1
|
1
|
0
|
0
|
import
java.util.Scanner;
public class EvenOrOdd
{
public static void
main(String[] args) {
int number;
System.out.println("Enter a number to check even or odd");
number
= new Scanner(System.in).nextInt();
if
((number & 1) == 0) {
System.out.println(+number
+ " is Even number");
} else
{
System.out.println(+number
+ " is Odd Number");
}
}
}
Output:
Enter a number to check even or odd
88
88 is Even number
Press any key to continue . . .
