题解 | 小红的正整数计数

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        //输入左右边界
        int leftBoundary = scanner.nextInt();
        int rightBoundary = scanner.nextInt();
        int countNumber = 0;
        for (int i = leftBoundary; i <= rightBoundary; i++) {
            if (i % 2 == 0) {
                countNumber++;
            }
        }
        System.out.println(countNumber);
    }
}