求c语言设计的一个学生学籍管理系统！急用！要有查询 增加 删除 修改功能！简单一点的就好了！急用啊！

Posted 2023-04-29

这两天就要用啊！如果能加上实训报告更好啊！

自己修改，我以前做的
#include <stdio.h>
#include <stdlib.h>
typedef struct node

char num[10];
char name[10];
int score[5];/*score[0]存数学成绩score[1]语文成绩score[2]英语成绩score[3]总分score[4]平均分*/
struct node *next;
student;/*学生成绩结构体*/
/*初始化结构体*/
student *init(student *t)

t=(student *)malloc(sizeof(student));
t->next=NULL;
t->score[4]=t->score[3]=t->score[0]=t->score[1]=t->score[2]=0;
return t;

/*保存数据*/
void save(student *stu)

FILE *fp;
if((fp=fopen( "score1","w"))==NULL)/*为输出打开文件score1*/

printf("cannot open file\n");exit(0);

stu=stu->next;
while(stu!=NULL)

if(fwrite(stu,sizeof(student),1,fp)!=1)
printf("file write error\n");
stu=stu->next;

fclose(fp);

/*读取数据*/
student * load(student *stu)

FILE *fp;student *p,*r;r=stu;
if((fp=fopen("score1","r"))==NULL)/*为输入打开文件score1*/
return stu;
do
p=(student *)malloc(sizeof(student));
p->next=NULL;
if((fread(p,sizeof(student),1,fp)!=1));
r->next=p;
r=r->next;
while(1);


/*输出一个特定的学生的成绩*/
void output1(student *t)
int k;
printf("%s\t%s\t",t->num,t->name);
for(k=0;k<5;k++)
printf("%d\t",t->score[k]);
printf("\n");

/*输出全体学生的成绩*/
void output(student *stu)

stu=stu->next;
printf("学号\t姓名\t数学\t语文\t英语\t总分\t平均分\n");
while(stu!=NULL)

output1(stu);
stu=stu->next;



/*将stu后插在t中*/
student * charu(student *stu,student *t)
student *p;int k;
p=(student *)malloc(sizeof(student));
strcpy(p->num,stu->num);
strcpy(p->name,stu->name);
for(k=0;k<5;k++)
p->score[k]=stu->score[k];
p->next=t->next;
t->next=p;
return p;

/*按成绩排序*/
void paixu(student *stu,int i)

student *t,*p,*r;
int j,k;p=stu;
printf("输入0按数学成绩\n");
printf("输入1按语文成绩\n");
printf("输入2按英语成绩\n");
printf("输入3按总分\n");
printf("输入4按平均分\n");
do

scanf("%d",&j);
if(j<0&&j>4) printf("输入错误请重新输入\n");
else break;
while(1);
t=init(t);
r=t;
stu=stu->next;
if(t->next==NULL)
r=charu(stu,t);/*在排序好的链表t中插入第一个节点*/
if(i==0)/*按升序排序*/
while(stu->next!=NULL)

stu=stu->next;
if(r->score[j]>stu->score[j]) r=t;/*如果待插入的score[j]<当前的score[j],指针r回溯*/
while(r->next->score[j]<stu->score[j]&&r->next!=NULL)
r=r->next;/*找到比待插入的score[j]大的指针r->next*/
r=charu(stu,r);/*在r后面插入stu*/

else
while(stu->next!=NULL)

stu=stu->next;

if(r->score[j]<stu->score[j]) r=t;
while(r->next->score[j]>stu->score[j]&&r->next!=NULL)
r=r->next;
r=charu(stu,r);

output(t);

/*排序菜单*/
void output2(student *stu)
int i;
output(stu);
printf("输入 0 升序\n");
printf("输入 1 降序\n");
printf("输入其他任意字符退出\n");
scanf("%d",&i);
if(i==0||i==1)
paixu(stu,i);
printf("输入任意字符结束\n");
getch();


/*查找学生号为num是否存在*/
student * findnum(char *num,student *t,int *i)

*i=1;
if(t->next==NULL)
return t;
else

*i=strcmp(t->next->num,num);
while(*i<0)/*t->next->num<num时查找下一个*/

t=t->next;
if(t->next==NULL)
return t;
*i=strcmp(t->next->num,num);


return t;/*t->next->num>=num时返回，此时i>=0*/

/*插入一个学生信息*/
student * insertstu(char *num,student *stu,char *name)
student *p,*t;int *i,j;i=&j;
t=findnum(num,stu,i);/*查找该学号是否存在*/
if(j!=0)/*该学号不存在，则插入*/

p=init(p);
strcpy(p->num,num);
strcpy(p->name,name);
p->next=t->next;
t->next=p;
return stu;

else


/*录入新学生信息*/
void base(student *stu)

char num[10],name[20];
printf("输入e结束输入新学生的信息\n");
printf("num(不超过10个数)\tname(不超过10个字)\n");
scanf("%s",num);
do

printf("\t\t\t");
scanf("%s",name);
stu=insertstu(num,stu,name);/*插入一个学生信息*/
scanf("%s",num);
while(num[0]!='e');
output(stu);
printf("输入任意字符退出\n");
getch();

/*增加修改一门课程成绩*/
void zengjia(student *t,int i)

t->score[3]-=t->score[i];/*总分减去第i门课的成绩*/
scanf("%d",&(t->score[i]));/*输入第i门课的成绩*/
t->score[3]+=t->score[i];/*总分加上第i门课的成绩*/

void deletegrade(student *t,int i)

t->score[3]-=t->score[i];/*总分减去第i门课的成绩*/
t->score[i]=0;/*第i门课的成绩归零*/

/*修改成绩*/
void altergrade(student *stu)

int j,*i;student *t;char a,*num;
i=&j;
printf("0 修改数学成绩\n");
printf("1 修改语文成绩\n");
printf("2 修改英语成绩\n");
printf("3 删除数学成绩\n");
printf("4 修改语文成绩\n");
printf("5 修改英语成绩\n");
printf("输入 e 结束操作\n");
a=getch();
printf("学号\t成绩\n");
scanf("%s",num);
while(num[0]!='e')

t=findnum(num,stu,i);/*按学生号查找学生信息*/
if(j==0)/*学生号存在*/

t=t->next;
switch(a)

case '0':
zengjia(t,0);
break;
case '1':
zengjia(t,1);
break;
case '2':
zengjia(t,2);
break;
case '3':
deletegrade(t,0);
break;
case '4':
deletegrade(t,1);
break;
case '5':
deletegrade(t,2);
break;
default:break;

t->score[4]=t->score[3]/3;

else
printf("无此学号\n");
scanf("%s",num);

output(stu);
printf("输入任意字符结束\n");
getch();

/*第i科成绩录入*/
student gradeenter(student *stu,int i)

student *t;t=stu;
t=t->next;
printf("学号\t该科成绩\n");
while(t!=NULL)

printf("%s\t",t->num);
if(t->score[i]==0)/*如果学号为t->num的同学该科成绩没有*/

scanf("%d",&t->score[i]);
t->score[3]+=t->score[i];/*学号为t->num的总分*/
t->score[4]=t->score[3]/3;/*学号为t->num的平均分*/

else
printf("%d\n",t->score[i]);
t=t->next;/*录入下一个同学的该科成绩*/


printf("该科全部输入完成\n输入任意字符结束\n");
getch();

/*成绩录入菜单*/
void entergrade(student *stu)

int i;
printf("0 录入数学成绩\n");
printf("1 录入语文成绩\n");
printf("2 录入英语成绩\n");
scanf("%d",&i);
switch(i)

case 0:gradeenter(stu,i);break;
case 1:gradeenter(stu,i);break;
case 2:gradeenter(stu,i);break;
default:printf("输入错误请输入相应操作的题号\n");



/*按学生号查找学生*/
void chaxun(student *stu)

char *num;int j,k,*i;student *t;i=&j;
printf("输入要查询的学生学号\n");
scanf("%s",num);
t=findnum(num,stu,i);/*查找学生号为num是否存在*/
if(j==0)/*该学生号存在*/

t=t->next;
printf("查询结果为\n");
printf("学号\t姓名\t数学\t语文\t英语\t总分\t平均分\n");
output1(t);/*输出此学生信息*/

else
printf("查无此号\n");
printf("输入任意字符结束\n");
getch();

/*统计全班人数和平均分*/
void tongji(student *stu)

int total=0,score=0;
stu=stu->next;
while(stu!=NULL)

score+=stu->score[3];
stu=stu->next;
total++;

score=score/total;
printf("班级总人数为:%d平均分为:%d\n输入任意字符退出\n",total,score);
getch();

/*按分数段查询*/
void fenshuduan(student *stu)

int i,min,max,j;
printf("输入0按数学分数段\n");
printf("输入1按语文分数段\n");
printf("输入2按英语分数段\n");
printf("输入3按总分分数段\n");
printf("输入4按平均分分数段\n");
scanf("%d",&i);
printf("输入分数段上限:");
scanf("%d",max);
printf("\n输入分数段下限:");
scanf("%d",min);
if(max<min)

stu=stu->next;
printf("学号\t姓名\t数学\t语文\t英语\t总分\t平均分\n");
while(stu!=NULL)

if(min<=stu->score[i]&&stu->score[i]<=max)/*将分数段内的同学信息输出*/
output1(stu);
stu=stu->next;



void main()

char a='8';
student *stu;
stu=init(stu);/*初始化stu*/
stu=load(stu);/*读取score1的数据*/
while(a!='7')

clrscr();
printf("************************************************************\n");
printf(" 学生成绩管理系统\n");
printf(" -------made in china\n");
printf(" \t0 录入学生基本信息\n");
printf(" \t1 修改或删除学生成绩\n");
printf(" \t2 录入学生成绩\n");
printf(" \t3 显示指定学生的信息\n");
printf(" \t4 输出指定分数段的学生信息\n");
printf(" \t5 输出班级总人数和平均分\n");
printf(" \t6 输出全体学生的信息\n");
printf(" \t7 退出\n");
printf("*************************************************************\n");
a=getch();
switch(a)

case'0':base(stu);break;
case'1':altergrade(stu);break;
case'2':entergrade(stu);break;
case'3':chaxun(stu);break;
case'4':fenshuduan(stu);break;
case'5':tongji(stu);break;
case'6':output2(stu);break;
case'7':break;
default:printf("i am sorry to hear that you enter the wrong num\n");
printf("按任意键重新输入\n");getch();continue;


save(stu);/*将数据保存在score1中*/
printf("欢迎再次使用学生成绩管理系统........请按任意键退出.......");
getch();

另外,站长团上有产品团购,便宜有保证 参考技术A //这个是大一的时候写的通信录的题目有增 删 修改功能。
//你就把里面的值 修改一下变量就可以了。
1 #include<iostream>
2 #include<string.h>
3 using namespace std;
4 struct Friend
5
6 double num;
7 string name;
8 char sex;
9 string telnum;
10 string addr;
11 Friend *next;
12 ;
13 Friend *head;
14 Friend *Create ()
15
16 Friend *ps;
17 Friend *pEnd;
18 ps = new Friend;
19 cout << " 请你输入朋友的编号：" << endl;
20 cin>>ps->num;
21 cout << " 请你输入朋友的姓名："<<endl;
22 cin>>ps->name;
23 cout << " 请你输入朋友的性别："<<endl;
24 cin>>ps->sex;
25 cout << " 请你输入朋友电话:" << endl;
26 cin>>ps->telnum;
27 cout << " 请你输入朋友的地址：" << endl;
28 cin>>ps->addr;
29 head = ps;
30 pEnd = ps;
31 cout<<" 是否继续输入：继续按Y ，退出按N "<<endl;
32 char m;
33 cin>>m;
34
35 if(m=='y'||m=='n'||m=='Y'||m=='N')
36
37 while (m=='y'||m=='Y' )
38
39 ps = new Friend;
40 cout << " 请你输入朋友的编号：" << endl;
41 cin>>ps->num;
42 cout << " 请你输入朋友的姓名："<<endl;
43 cin>>ps->name;
44 cout << " 请你输入朋友的性别："<<endl;
45 cin>>ps->sex;
46 cout << " 请你输入朋友电话:" << endl;
47 cin>>ps->telnum;
48 cout << " 请你输入朋友的地址：" << endl;
49 cin>>ps->addr;
50 pEnd->next = ps;
51 pEnd = ps;
52 char n;
53 cout<<" 是否继续输入：继续按Y ，退出按N "<<endl;
54 cin>>n;
55 if(n!='y'&&n!='Y')
56 m='N';
57 else
58 m='y';
59
60
61 else
62 cout<<" 对不起，你输入了非法数据。"<<endl;
63 pEnd->next = NULL;
64 return (head);
65
66
67 void chaxun(int num1,string name1) //
68 int r=0;
69 if(head==NULL)
70
71 r++;
72 cout<<" 对不起，没有你所查找的朋友："<<endl;
73 return;
74
75
76 for (Friend * pGuard = head; pGuard; pGuard = pGuard->next)
77
78 if (pGuard->num==num1)
79
80 r++;
81 cout<<" 你查找的朋友信息是："<<endl;
82 cout<<pGuard->num<<" "<<pGuard->name<<" "<<pGuard->sex<<" "<<pG
uard->telnum<<" "<<pGuard->addr<<endl;
83
84 if( pGuard->name==name1)
85
86 r++;
87 cout<<" 你查找的朋友信息是："<<endl;
88 cout<<pGuard->num<<" "<<pGuard->name<<" "<<pGuard->sex<<" "<<pGua
rd->telnum<<" "<<pGuard->addr<<endl;
89
90
91 if(r==0)
92 cout<<" 对不起，你输入了错误信息"<<endl;
93
94
95 void Delete (int number)
96
97 Friend *p;
98 if (head == NULL)
99
100 cout << "对不起，没有你所查找的朋友：" << endl;
101 return;
102
103
104 if (head->num == number)
105
106 p = head;
107 head = head->next;
108 delete p; //**************
109 cout << " 待删除的朋友已删除" << endl;
110 return;
111
112
113 for (Friend * pGuard = head; pGuard->next; pGuard = pGuard->next)
114
115 if (pGuard->next->num == number)
116
117 p = pGuard->next;
118 pGuard->next = p->next;
119 delete p;
120 cout << number << " 号已经删除 " << endl;
121 return;
122
123
124 cout << number << " 号没有找到" << endl;
125
126 void insert (Friend * Node)
127
128 if (head == NULL)
129
130 head = Node;
131 Node->next = NULL;
132 return;
133
134 else if (head->num > Node->num)
135
136 Node->next = head;
137 head = Node;
138 return; //****************************
139
140 Friend *pGuard = head;
141 while (pGuard->next && pGuard->next->num < Node->num)
142 pGuard = pGuard->next;
143 Node->next = pGuard->next;
144 pGuard->next = Node;
145 return;
146
147 void showlist (Friend * dhead)
148
149 cout << "************" << endl;
150 while (dhead != NULL)
151
152 cout << dhead->num << " " << dhead->name << " " << dhead->sex<<
" " << dhead->telnum <<" "<<dhead->addr<<endl;
153 dhead = dhead->next;
154 cout << endl;
155
156
157 int main ()
158
159 char i2,i3;
160 head = Create ();
161 showlist (head);
162
163 int t=0;
164 for(int i=0;i<=t;i++)
165
166 int i;
167 cout<<" 通讯录查询请按 1"<<endl;
168 cout<<" 通讯录插入请按 2"<<endl;
169 cout<<" 通讯录删除请按 3"<<endl;
170 cout<<" 退出请按 4 "<<endl;
171 cin>>i;
172 while(i!=1&&i!=2&&i!=3&&i!=4)
173
174 cout<<" 你输入了非法数据,请重新输入"<<endl;
175 cin>>i;
176
177
178 if(i==1|i==2||i==3||i==4)
179
180 string strChoice;
181 if(i==1)
182
183 do
184
185 cout<<" 请选择查询的方式：编号1，姓名2 "<<endl;
186 int jj;
187 cin>>jj;
188 string name2; //name
189 if(jj==1)
200 string name2;
201 cout<<" 请输入待查询的姓名："<<endl;
202 cin>>name2;
203 chaxun(-1,name2);
204
205 cout<<" 是否继续查询：继续按Y ，退出按N "<<endl;
206 cin>>strChoice;
207 while (strChoice=="y"||strChoice=="Y");
208
209
210 if(i==2)
211
212 string strChoice2;
213 do
214
215 Friend *Node;
216 Node = new Friend;
217 cout << " 请你输入朋友的编号：" << endl;
218 cin>>Node->num;
219 cout << " 请你输入朋友的姓名："<<endl;
220 cin>>Node->name;
221 cout << " 请你输入朋友的性别："<<endl;
222 cin>>Node->sex;
223 cout << " 请你输入朋友电话:" << endl;
224 cin>>Node->telnum;
225 cout << " 请你输入朋友的地址：" << endl;
226 cin>>Node->addr;
227 insert (Node);
228 showlist (head);
229 cout<<" 是否继续插入信息：继续按Y ，退出按N"<<endl;
230 cin>>strChoice2;
231 while(strChoice2=="y"||strChoice2=="Y");
232
233
234
235 if(i==3)
236
237 string strChoice3;
238 do
239
240 int i;
241 cout << " 请你输入待删除同学的编号 ：" << endl;
242 cin >> i;
243 Delete (i);
244 showlist (head); //end
245 cout<<" 是否继续进行删除 继续按Y 退出按N "<<endl;
246 cin>>strChoice3;
247 while(strChoice3=="y"||strChoice3=="Y");
248
249
250 if(i==1||i==2||i==3)
251 char x;
252 cout<<" 是否继续进行操作 继续按Y 退出按N "<<endl;
253 cin>>x;
254 if(x=='y'||x=='Y')
255 t++;
256
257
258
259
260 本回答被提问者和网友采纳

高级语言程序设计II 实验报告四学生学籍系统，使用c++

高级语言程序设计II

实验报告四

姓名：许恺

学号：2014011329

日期：6月26日

1. 实验目的

制作学生学籍系统，使用c++知识，又补充和查找的功能

2. 设计思路

建立三个类，student储存读出来的文件内容，change对文件进行补充和读取，seek进行查找和打印。

3. 代码实现

主函数：

// c++第四次报告.cpp :定义控制台应用程序的入口点

//

#include "stdafx.h"

#include <iostream>

#include <fstream>

#include "student.h"

#include "change.h"

#include "seek.h"

const int N=1000;

using namespace std;

int _tmain(int argc, _TCHAR* argv[])

int t,ch;

char f[50];

student* stu=new student[N]; 学生信息对象

change change1; 使用类的对象

seek seek1;

cout<<"Hello! Welcome to Student Information System!"<<endl;

cout<<"Please input student information file:";

cin>>f; 输入文件名

fstream fp; 文件

fp.open(f,ios::_Nocreate|ios::out|ios::in);

t=change1.read(fp,stu);

cout<<"The file contians total "<<t<<" students information\\n"<<endl;

do

cout<<"Please select the following one function by input its number"<<endl;

cout<<"-------------------------------------------------------------"<<endl;

cout<<"[1] input student information"<<endl;

cout<<"[2] query a students information by his or her name"<<endl;

cout<<"[3] query students list according to scope of scores"<<endl;

cout<<"[4] quit the program"<<endl;

cout<<"----------------------------------------------------------------"<<endl;

cin>>ch;

if(ch==1)

　　t=change1.reinput(fp,stu,t);

if(ch==2)

　　seek1.two(stu,t);

if(ch==3)

　　seek1.three(stu,t);

if(ch==4)

　　return 0;

while(1);

return 0;

student.h://储存文件的内容作为桥梁​

#pragma once

#include <fstream>

#include <iomanip>

#include <iostream>

using namespace std;

class student

public:

int getnum()return num;;

void getnum(int a)this->num=a;;

char* getname()return name;;

char* getsex()return sex;;

int getage()return age;;

void getage(int b)this->age=b;;

char* getadd()return address;;

int getadd(char *str)

int len;

strcpy_s(address,str);

len=strlen(str);

return len;

;

private:

int num;

char name[20];

char sex[5];

int age;

char address[1000];

;

change.h:    //读文件和写入信息​

#pragma once

//#pragma comment( lib, "opencv_highgui244d.lib")

//#pragma comment( lib, "opencv_core244d.lib")

#include "student.cpp"

#include <fstream>

class change

public:

int read(std::fstream &f,student *stu);

int reinput(std::fstream &f,student *stu,int a);

;

change.cpp:

#include "StdAfx.h"

#include "change.h"

#include "student.h"

#include <iomanip>

#include <iostream>

#include <string>

int read(fstream &f,student *stu)

int a,old;

for(a=0;;a++)

char str[1000];

int num=0;

f>>setw(10)>>num;

if(num==0)

　　break;

stu[a].getnum(num);

f>>setw(20)>>stu[a].getname();

f>>setw(5)>>stu[a].getsex();

f>>setw(5)>>old;

stu[a].getage(old);

f.getline(str,1000,\\n);

stu[a].getadd(str);

return a;

int reinput(fstream &f,student *stu,int a)

char c;

do

a++;

int b,o,len;

char str[1000];

f.seekg(0,ios::end);

f<<"\\n";

cout<<"Please input students information:"<<endl;

cout<<"num:";

cin>>b;

stu[a].getnum(b);

cout<<"name:";

cin>>stu[a].getname();

cout<<"sex:";

cin>>stu[a].getsex();

cout<<"old:";

cin>>o;

stu[a].getage(o);

cout<<"address:";

cin>>str;

cout<<"_____________________________________________"<<endl;

cout<<"Are you sure to add the information?(Y/N):";

cin>>c;

if(c==Y)

len=stu[a].getadd(str);

f<<setw(10)<<setiosflags(ios::left)<<b;      

f<<setw(20)<<setiosflags(ios::left)<<stu[a].getname();

f<<setw(5)<<setiosflags(ios::left)<<stu[a].getsex();

f<<setw(5)<<setiosflags(ios::left)<<o;

f<<setw(len)<<str<<endl;

cout<<"The file has "<<a+1<<" students."<<endl;

else

cout<<"The file has "<<a<<" students."<<endl;

stu[a].getnum(0);

memset(stu[a].getname(),0,20);

memset(stu[a].getsex(),0,5);

stu[a].getage(0);

memset(str,0,1000);

stu[a].getadd(str);

cout<<"Do you continute to input another information?(Y/N):";

cin>>c;

while(c==Y);

return a;

seek.h://按照姓名查找和年龄范围​

#pragma once

#include "student.h"

class seek

public:

void two(student *stu,int t);

void three(student *stu,int t);

;

seek.cpp:

#include "StdAfx.h"

#include "seek.h"

#include "student.h"

void seek::two(student *stu,int t)

char c;

do

int a,b=0,s[100];

char name[20];

cout<<"Please input the students name:";

cin>>name;

for(a=0;a<20;a++)

　　if(name[a]==\\0)

　　　　break;

for(;a<20;a++)

　　name[a]= ;

name[19]=\\0;

for(a=0;a<t;a++)

if(strcmp(stu[a].getname(),name)==0)

s[b]=a;

b++;

cout<<"Search "<<b<<" students."<<endl;

cout<<"------------------------------------"<<endl;

for(a=0;a<b;a++)

cout<<"num:";

cout<<stu[a].getnum()<<endl;

cout<<"name:";

cout<<stu[a].getname()<<endl;

cout<<"sex:";

cout<<stu[a].getsex()<<endl;

cout<<"age:";

cout<<stu[a].getage()<<endl;

cout<<"address:";

cout<<stu[a].getadd()<<endl;

cout<<"-------------------------------------------------------------"<<endl;

cout<<"Do you continue to query another students information?(Y/N):";

cin>>c;

while(c==Y);

void seek::three(student *stu,int t)

char c;

do

int b=0,a,min,max,s[1000];

cout<<"Please input the scope of age:"<<endl;

cout<<"Min-age:";

cin>>min;

cout<<"Max-age:";

cin>>max;

for(a=0;a<t;a++)

if(stu[a].getage()<=max&&stu[a].getage()>=min)

s[b]=a;

b++;

cout<<"Search "<<b<<" students."<<endl;

cout<<"-------------------------------------------"<<endl;

for(a=0;a<b;a++)

cout<<setw(10)<<setiosflags(ios::left)<<stu[s[a]].getnum();      

cout<<setw(20)<<setiosflags(ios::left)<<stu[s[a]].getname();

cout<<setw(5)<<setiosflags(ios::left)<<stu[s[a]].getsex();

cout<<setw(5)<<setiosflags(ios::left)<<stu[s[a]].getage();

cout<<setw(strlen(stu[s[a]].getadd()))<<stu[s[a]].getadd()<<endl;

cout<<"-----------------------------------------------"<<endl;

cout<<"Do you continue to query another scope?(Y/N):";

cin>>c;

while(c==Y);

 

4. 实验结果及分析

程序还有很多不足，需要改进，有些问题实在难以解决，还需继续努力，望老师谅解。

 （我c，这报告大一写的，这tm一看就是抄的啊，自己当时估计都羞愧的不好意思写结果分析了23333333，太傻太天真~）