Java——阶段练习（1）

class su
{ public static void main(String [] args)
        {
for(int a=1;a<=200;a++){
   boolean flag=true;
   for(int b=2;b<Math.sqrt(a);b++){
     if(a%b==0){
      flag=false;
      break;
 }
}
if(flag&&a!=1){
 System.out.println(a+"");
  }
}
}
}

public class nb {
 public static void main(String[] args) {
 System.out.println(2);
 for(int c=3;c<=200;c++) {
     int d=0;
  for(int b=2;b<c;b++) {
   if(c%b==0) {
    d++;
   }
  }
  if(d==0) {
   System.out.println(c);
  }
 }
}

public class 作业2 { public static void main(String[] args) {
  int a,b,c,d,e,f,h;
  int i=0;
  for(a=1;a<=4;a++) {
   d=a*100;
   for(b=1;b<=4;b++) {
    e=b*10;
    for(c=1;c<=4;c++) {
     f=c;
     i++;
     h=d+e+f;
     System.out.println(h+",");
    }
   }
  }
         System.out.print("共计"+i+"个数");}
 }

public class paixu {public static void main(String[] args) {
 int [] a= {11,4,51,45,15,8,21,81};
 System.out.println("排序前:");
 for(int b=0;b<a.length;b++) {
 System.out.println(" "+a[b]);}
 System.out.println("排序后:");
 for(int c=7;c>= 0;c--) {
  System.out.println(" "+a[c]);
 }
}
}

public class maiji {public static void main(String[] args) {
 //int a,b,c;
 for(int a=0;a<20;a++)
  for(int b=0;b<=33;b++)
   for(int c=0;c<300;c++)
 if((a*5+b*3+c*(1/3)==100)&&a*b*c!=0&&a+b+c==100) {
  System.out.println("共计公鸡"+a+"只");
  System.out.println("共计母鸡"+b+"只");
  System.out.println("共计小鸡"+c+"只"+"------");
 }
}
}

public class fq {public static void main(String[] args) {
 int a=0,c=1;
 for(int b=0;b<=20;b=b+2) {
  System.out.print(" "+a+" "+c);
 a=a+c;
 c=c+a;
 }
}
}

public class dazhe {public static void main(String[] args) {
 System.out.println("请输入商品总额");
 Scanner r=new Scanner(System.in);
 int a=r.nextInt();
 double b;
 if(a<=200)
  b=a*1;
  if(a>200&&a<=500);
       b=a*0.9;
  if(a>500&&a<=800);
     b=a*0.85;
     if(a>800) ;
     b=a*0.8;
     System.out.println("最后价格为"+b+" ");
}
}

import java.util.*;
public class cj {public static void main(String[] args) {
 System.out.println("请输入你的分数");
 Scanner r=new Scanner(System.in);
 int a=r.nextInt();
 a=a/10;
 switch(a) {
 case 6 :
  System.out.println("你才及格，你个菜鸡");
  break;
 case 7 :
  System.out.println("刚及格，你海星");
  break;
  case 8:
   System.out.println("哎哟 不错偶");
   break;
  case 9 :
   System.out.println("大神666");
   break;
   default:
    System.out.println("还没及格 滚回家放牛吧");
 }
 }
}

public class bb {public static void main(String[] args) {
 int a=0,b=1,c=1;
 while(c<=20) {
  System.out.print(" "+a+" "+b);
  a=a+b;
  b=a+b;
  c=c+2;
 }
}
}

public class paixu2 {public static void main(String[] args) {
 int [] a= {11,4,51,45,15,8,21,81};
 System.out.println("排序前:");
 for(int b=0;b<a.length;b++) {
 System.out.println(" "+a[b]);}
 System.out.println("排序后:");
 for(int e=1;e<a.length;e++)
 for(int c=0;c<a.length-e;c++) {
  if(a[c]<a[c+1]) {
   int d=a[c];
   a[c]=a[c+1];
   a[c+1]=d;}
 }
   for(int f=0;f<a.length;f++) {
    System.out.println(" "+a[f]);}
}
}