FizzBuzz

FizzBuzz is a small exercise that’s popular for practicing basic control flow: loops, conditionals, and the modulo operator.

The rules

For each number from 1 to 100:

• If it’s divisible by both 3 and 5, print FizzBuzz.
• If it’s divisible by 3, print Fizz.
• If it’s divisible by 5, print Buzz.
• Otherwise, print the number itself.

public class FizzBuzz {
    public static void main(String[] args) {
        for (int i = 1; i <= 100; i++) {
            if (i % 15 == 0) {
                System.out.println("FizzBuzz");
            } else if (i % 3 == 0) {
                System.out.println("Fizz");
            } else if (i % 5 == 0) {
                System.out.println("Buzz");
            } else {
                System.out.println(i);
            }
        }
    }
}

Try it yourself: the highlighted lines (4–11) are the whole algorithm — try changing 15 to a different combined divisor, or adding a third rule (e.g. multiples of 7 print Bazz).

Why check divisible-by-15 first?

15 is divisible by both 3 and 5, so if you checked i % 3 == 0 first, numbers like 15 and 30 would print Fizz and never reach the FizzBuzz branch. Checking the combined case (% 15) first avoids that ordering bug.