1、import java.util.Scanner;public class Demo4 {public static void main(String[] args) {Scanner sc=new Scanner(System.in);int i=(int)(Math.random()*100);while(true){System.out.println("请输入数字：");}
2、int j=sc.nextInt();if(j==0){System.out.println("退出系统！");break;}if(j>i){System.out.println("大");}if(j<i){/*if(j==0){
3、System.out.println("退出系统！");break;}*/System.out.println("小");}if(j==i){System.out.println("恭喜答对！");break;}}}
4、import java.util.Scanner;public class Demo4 {public static void main(String[] args) {Scanner sc=new Scanner(System.in);int i=(int)(Math.random()*100);while(true){System.out.println("请输入数字：");int j=sc.nextInt();if(j==0){System.out.println("退出系统！");break;}if(j>i){System.out.println("大");}if(j<i){/*if(j==0){System.out.println("退出系统！");break;}*/System.out.println("小");}if(j==i){System.out.println("恭喜答对！");break;}}}}
5、给定年份和月份，判断从当年1月份到当前月的上个月的总天数年份：2016月份：2控制台输出“2016年1月到2016年2月总天数60”
6、package javaDome;import java.util.Scanner;public class Day_1 {public static int getDay(int year,int month){int day=0;if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { day = 31;}if (month == 4 || month == 6 || month == 9 || month == 11) { day = 30;}if (month == 2) {if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { day = 29;} else { day = 28;}}return day;}public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("请输入年份：");int year = sc.nextInt();System.out.println("请输入月份：");int month = sc.nextInt();int month1=0,year1=0;int day= getDay(year,month);if(month==1){month1=12;year1=year-1;}else{month1=month-1; year1=year;}int day1=getDay(year1,month1);int day2=day+day1;System.out.println(year1 + "年" + (month1) + "月到" + year + "年" + month + "月总共" + day2 + "天。");}}
