6

 

1.

package zy;

public class sj1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int sum=0;
        for (int i = 1; i <=100; i++) {
            if (i%10!=3&&i!=3) {
                sum+=i;
            }
            
        }
        System.out.println(sum);
    }

}

 

2.

package zy;

public class sj2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for (int i = 1; i <=4; i++) {
            for (int j = 1; j <=4-i; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k <=2*i-1; k++) {
                System.out.print("*");
            }
            System.out.println();
            
            
        }
    }

}

 

package zy;

public class sj21 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for (int a = 1; a <=5; a++) {
            for (int b = 5; b >=a; b--) {
                System.out.print("*");
            }
            System.out.println();
        }
        
        
    }

}

 

 

 

3.

package zy;

import java.util.Scanner;

public class sj3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入名字");
        String name=input.next();
        while (name!="Q") {
            System.out.println("输入错误，重新输入");
            name=input.next();
            if (name.equals("Q")) {
                System.out.println("正确");
                break;
            }
            
        }
        
    }

}

 

4.

package zy;

import java.util.Scanner;

public class sj4 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        Scanner input=new Scanner(System.in);
        System.out.println("输入五个成绩");
        int sum=0;
        int i=0;
        while(i<5)
        {
            int grade=input.nextInt();
            if(grade<0||grade>100)
            {
                System.out.println("再次输入");
            }
            else
            {
                sum+=grade;
                i++;
            }
        }System.out.println(sum);
    }

}

 

 

5.

 

 

package zy;

public class zy1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double sum=0;
        for (int i = 1; i <=10; i++)
        {
            int a=0;
            for (int j = 1; j <=i; j++) 
            {
                a+=j;
            }
            sum+=(1.0/a);
            
        }
        System.out.println(sum);
    }

}

 

1.

 

package zy;

import java.util.Random;
import java.util.Scanner;

public class zy2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Random a=new Random();
        int x= a.nextInt(100);
        Scanner input=new Scanner(System.in);
        int n= input.nextInt();
        int b=1;
        while (n!=x) {
        if (n>x) {
        System.out.println("大了点");
        }
        else if (n<x) {
        System.out.println("小了点");
        }
        n=input.nextInt();
        if (n==x) {
        System.out.println("猜对了");
        }
        b++;
        }
        if(b>0&&b<=3){
        System.out.println("太棒了");
        }
        else if(b>=4&&b<=8){
        System.out.println("一般般");
        }
        if(b>8){
        System.out.println("太笨了");
        }
        System.out.println("猜的次数为"+b);
        System.out.println("猜的数是"+x);
            
        }
        
    }

 

2.

 

package zy;

import java.util.Scanner;

public class zy3 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入一个数");
        int num=input.nextInt();
        int a=0;
        int i=2;
        while(i<num)
        {
            if(num%i==0)
            {
                System.out.println(num+"不是质数");
                a++;
                break;
            }
            i++;
        }
        if(a==0)
        {
            System.out.println("是质数");
        }
        
    }

}

 

3.

package zy;

public class zy4 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a=1;
        int b=1;
        int c=0;
        for(int i=1;i<=18;i++){
            c=a+b;
            a=b;
            b=c;
        }
            System.out.println("第20项为"+c);
            
        }
    }