1-100中统计9出现的次数，用Java实现

public class homework1 {
    public static void main(String[] args) {

        int count = 0;
        for (int i = 1; i <=100 ; i++) {
            if (i%10==9||i/10==9){

                count++;
            }

        }

        System.out.println(count);
    }
}

运行结果