Java第六次上机作业

课堂练习:

1.

 package hjbzxci;

public class lj {

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

            
        }
  System.out.println(sum);
    }

}

 

 2.

package hjbzxci;

public class lj {

    /**
     * @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 <=7-i; j++) {
                System.out.print(" ");
                
            }
        for (int k = 1; k <=2*i-1; k++) {
            System.out.print("*");
            
        }
          System.out.println(" ");
    }
        
}
}

 

 

 package hjbzxci;

public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for (int i = 1; i <=5; i++) {
            for (int j = 1; j <=6-i; j++) {
                System.out.print("*");
                
            }
    
          System.out.println(" ");
    }
        
}
}

 

 3.

package hjbzxci;

import java.util.Scanner;
public class lj {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        
        for (;;) {
                System.out.print("请输入学生姓名");
                String name=input.next();
                if(name.equals("Q")){
                System.out.println("程序结束");
                break;
            }
    
          
    }
        
}
}

 

 4.

package Gank;

import java.util.Scanner;

public class ClassH5 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int sum=0;
    for (int i = 0; i < 5; i++) {
            System.out.println("请输入学生成绩");
            int score=input.nextInt();
            if (score<0||score>100) {
                i--;
                System.out.println("输入错误请重新输入");
                continue;
            }
            sum+=score;
        }
        System.out.println("输入成功"+"\t"+"成绩总和为"+sum);
        

    }

}

 

 5.

package hjbzxci;


public class lj {

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

       System.out.println(a);
            }
    
    }
    
        

 

 作业：

1.

package java6;
 
import java.util.Random;
import java.util.Scanner;
 
public class Class1 {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        Random r=new Random();
        int a=r.nextInt(99);
        int b=input.nextInt();
        int y=1;
        while(y>=1){
            if (b<a) {
                System.out.println("小了点");
                b=input.nextInt();
                y++;
                 
            }else if(b>a){
                System.out.println("大了点");
                b=input.nextInt();
                y++;
                 
            }else{
                System.out.println("猜对了");
                if(y<=3&&y>=1){
                    System.out.println("太棒了");
                    break;
                }else if (y>=4&&y<=8) {
                    System.out.println("一般般");
                    break;
                     
                }else{
                    System.out.println("太笨了");
                    break;
                }
                 
            }
        }System.out.println(a);
 
    }
 
}

 

 2.

package java6;
 
import java.util.Scanner;
 
public class Class2 {
 
 
    /**
     * @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 a=input.nextInt();
        if(a>=2){
        for(int i=2;i<=a;i++){
            if(a%i==0&&a!=i){
                 
            System.out.println(a+"不是质数");
             
            }else{
                System.out.println(a+"是质数");
                break;
        }
 
    }
    }else{
        System.out.println(a+"不是质数");
    }
}
    }

 

 3.

package java6;
 
public class Class3 {
 
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a=1;
        int b=1;
        int c=1;
        for(int i=1;i<19;i++){
            c=a+b;
            a=b;
            b=c;
             
        }
        System.out.println(c);
 
    }
 
}