package day01;public class BiJiaoDaXiao {public static void main(String[] args){int a=43,b=53,c=12;if(a>b){if(b>c)System.out.println("最小数是:"+c);  elseSystem.out.println("最小数是:"+b);}else{if(a<c) System.out.println("最小数是:"+a);else System.out.println("最小数:"+c);}
}
}

package day01;import java.util.Scanner;public class SwitchCase {public static void main(String[] args){System.out.println("请输入一个百分制成绩:");Scanner scn = new Scanner(System.in);int grade = scn.nextInt();int dengji = grade/10;System.out.println(dengji);switch(dengji){case 10:System.out.println(grade+"分优秀");break;case 9:System.out.println(grade+"分优秀");break;case 8:System.out.println(grade+"分良好");break;case 7:System.out.println(grade+"分良好");break;case 6:System.out.println(grade+"分合格");break;default :System.out.println(grade+"分不及格");break;}}}

package day02;import java.util.Scanner;public class Math1 {public static void main(String[] args){//生成一个随机数作为猜测的结果int num = (int)(Math.random()*100+1);System.out.println(num);//第一次猜测System.out.println("请输入你猜的数:");Scanner scan = new Scanner(System.in);int guest = scan.nextInt();//如果猜错则继续while(guest!=num){//输入0，则退出循环if(guest == 0){break;}else if (guest>num){System.out.println("太大了！！");}else{System.out.println("太小了！");}System.out.println("请输入你猜的数字（1~100），退出请按0！");guest = scan.nextInt();}if(guest == num){System.out.println("恭喜你猜对了！！");}else{System.out.println("真遗憾，下次再挑战吧！");}scan.close();}}

 1 package day01;
 2
 3 import java.util.Scanner;
 4
 5 public class doWhile1 {
 6     public static void main(String[] args){
 7         int pwd;
 8         //do-while语句的执行过程为，先执行语句块，再判断boolean表达式，如果为true则再次执行语句块，如此循环往复，直到boolean表达式的值为false时止。也就是说，
 9         //do-while语句，无论boolean表达式是否为true，都先执行一次语句块。
10         do{
11             Scanner scanner = new Scanner(System.in);
12             System.out.println("请输入密码");
13             pwd = scanner.nextInt();
14         }while (123 != pwd);
15     }
16
17 }

 1 package day01;
 2
 3 public class ForXunhuan {
 4     public static void main(String[] args){
 5         int sum =0;
 6         for (int i =1;i<=100;i++){
 7             System.out.println("i="+i);
 8             sum+=i;
 9         }
10         System.out.println(sum);
11     }
12
13 }

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