第六次Java作业

1.

package diliuzhou;

public class Text {

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

}
}

 

 

 2.

package diliuzhou;

public class zuoye2 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
for (int i = 1; i < 5; i++) {
for (int j = 4-i; j>0; j--) {
System.out.print(" ");
}
for (int j = 1; j <= i*2-1; j++){
System.out.print("*");
}
System.out.println();
}
}

}

 

 2.1

package diliuzhou;

public class zuoye2 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
for (int i = 1; i <= 5; i++) {
for (int j = 5-i; j>0; j--) {
System.out.print("*");
}

System.out.println();
}
}

}

 

 

3.

package diliuzhou;

import java.util.Scanner;

public class zuoye3 {

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

 

 4.

package diliuzhou;

import java.util.Scanner;

public class zuoye4 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner d=new Scanner(System.in);
int sum=0;
for(int i=1;i<=5;i++){
System.out.println("输入学生成绩");
int chengji=d.nextInt();
if(chengji>100||chengji<0){
System.out.println("输入 错误重新输入 ");
chengji=d.nextInt();
}
sum=sum+chengji;
}
System.out.println(sum);
}

}

 

 5.

package diliuzhou;

 

public class zuoye5 {

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

sum+=1/d;
}
System.out.println(sum);
}

}

 

作业1.

package diliuzhou;
import java.util.Random;
import java.util.Scanner;
public class zuoye6 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Random d = new Random();
Scanner l=new Scanner(System.in);
int suijishu = d.nextInt(100);
int x=l.nextInt();
int cishu = 0;
while(true){
if(x>suijishu){
System.out.println("大了点");
x=l.nextInt();

cishu++;
}
if(x<suijishu){
System.out.println("小了点");
x=l.nextInt();

cishu++;
}
if(x==suijishu){
System.out.println("猜对了");
break;
}


}
if(cishu<3){
System.out.println("太棒了");
}
if(cishu>5&&cishu<=8){
System.out.println("一般般");
}
if(cishu>8){
System.out.println("太笨了");
}
}

}

 

 作业2.

package diliuzhou;

import java.util.Scanner;

public class zuoye7 {

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

}

 

 作业3.

package diliuzhou;

public class zuoye8 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
int d[] = new int[20];
for (int i = 2; i < 20; i++) {
d[0] = 1;
d[1] = 1;
d[i] = d[i-1]+d[i-2];

}
System.out.println("裴波那契数列第20项是"+d[19]);
}

}