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A number is known as an even number if it is a natural number and divisible by 2. On the other hand, an odd number is a natural number which not divisible by 2. Examples:

  • Even Number: -10, -4, 0, 6, 18, 50
  • Odd Number: -11, -5, -1, 9, 21, 99

Example: Using conditional statements

In the below example, the number called MyNum is checked for even number by dividing it by 2 and checking the remainder. For even number, the remainder is 0 and for odd number, the remainder is 1.

public class MyClass {
 public static void main(String[] args) {
    int MyNum = 17;
    if (MyNum % 2 == 0){
      System.out.println(MyNum + " is an even number.");
    } else if (MyNum % 2 == 1) {
      System.out.println(MyNum + " is an odd number.");
    }
  }
}

The above code will give the following output:

17 is an odd number.

Example: Using function

In the below example, a function called CheckEven() is created which takes a number as argument and checks it for even number.

public class MyClass {
  static void CheckEven(int MyNum) {
    if (MyNum % 2 == 0){
      System.out.println(MyNum + " is an even number.");
    } else if (MyNum % 2 == 1) {
      System.out.println(MyNum + " is an odd number.");
    }
  }
 public static void main(String[] args) {
    CheckEven(42);
  }
}

The above code will give the following output:

42 is an even number.

Example: Using bitwise operators

When bitwise operator is used, the last bit of the given number is checked. If the last bit is 1, the number will be odd and if the last bit is 0, the number will be even.

Even Number:  50 ->    110010
                     & 000001
                     ---------
                       000000

Odd Number:   99 ->   1100011
                    & 0000001
                     ---------
                      0000001

public class MyClass {
  static void CheckEven(int MyNum) {
    if ((MyNum & 1) == 1){
      System.out.println(MyNum + " is an odd number.");
    } else {
      System.out.println(MyNum + " is an even number.");
    }
  }
 public static void main(String[] args) {
    CheckEven(50);
    CheckEven(99);
  }
}

The above code will give the following output:

50 is an even number.
99 is an odd number.