How to judge whether a number is odd or even ？

Judge whether a number is odd or even , The easiest thing to think of is right 2 Remainder .

Method 1

int number = 11;
if (number % 2 == 0) {
    
    System.out.println("Number For the even ");
} else {
    
    System.out.println("Number It's odd ");
}

Output results ：Number It's odd

int number = 10;
if (number % 2 == 0) {
    
    System.out.println("Number For the even ");
} else {
    
    System.out.println("Number It's odd ");
}

Output results ：Number For the even

Method 2

int number = 11;
if ((number & 1) == 0) {
    
    System.out.println("Number For the even ");
} else {
    
    System.out.println("Number It's odd ");
}

Output results ：Number It's odd

int number = 10;
if ((number & 1) == 0) {
    
    System.out.println("Number For the even ");
} else {
    
    System.out.println("Number It's odd ");
}

Output results ：Number For the even

What is the principle of method 2 ？

In the computer , Data is stored in complementary binary .
The lowest of even numbers must be 0.
The lowest of odd numbers must be 1.
So if you want to judge whether this number is odd or even , Just use this number to bitwise AND 1 That's all right. .
If the result is 0, So this number is even , If the result is 1, Then this number is odd .

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