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用c++模拟实现一个学生成绩管理系统
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https://blog.csdn.net/yanxiaolx/article/details/53393437
題目：用c++模擬實現一個學生成績的信息管理系統，要求能添加、刪除、修改、查看和保存學生的信息等功能
源代碼如下:
[cpp]?view plaincopy
#define??_CRT_SECURE_NO_WARNINGS????#include<iostream>??using?namespace?std;??#include<string.h>??#include<fstream>????class?student??{??private:??????student*?next;??public:??????char?stu_num[15];????????????????????????char?stu_name[30];??????????????????????float?stu_score;??????????????????????????????void?afterInsert(student?*p);??????void?afterDelete();????????????student?*getNext()??????{???????????return?next;???????}??????????????void?getMage();??????????????void?changeMage(int?n,?char?*ptr);??????void?changegrade(float?p);??????????????student(char?*num,?char?*name,?float?score);??????student();??};????void?student::changegrade(float?p)??{??????stu_score?=?p;??}????student::student()?????????????{??????strcpy(stu_num,?"\0");??????strcpy(stu_name,?"\0");??????stu_score?=?0;??????next?=?'\0';??}????student::student(char?*num,?char?*name,?float?score)??{??????strcpy(stu_num,?num);??????strcpy(stu_name,?name);??????stu_score?=?score;??????next?=?'\0';??}????void?student::afterInsert(student?*p)??{??????p->next?=?next;??????next?=?p;??}????void?student::afterDelete()??????????{??????student?*p?=?next;??????next?=?p->next;??????delete?p;??}????void?student::getMage()???????????????{??????cout?<<?"學號："?<<?stu_num?<<?"??????姓名："?<<?stu_name;??????cout?<<?"??????c++成績："?<<?stu_score?<<?endl;??}????void?student::changeMage(int?n,?char?*ptr)??{??????switch?(n)??????{??????case?1:?strcpy(stu_num,?ptr);???????????break;??????case?2:?strcpy(stu_name,?ptr);??????}??}??????void??construct_list(student?*tail)??{??????student?*p?=?new?student;??????char?very[20];??????float?achieve;??????cout?<<?"請輸入學號:"?<<?endl;??????cin?>>?very;??????p->changeMage(1,?very);??????cout?<<?"請輸入姓名："?<<?endl;??????cin?>>?very;??????p->changeMage(2,?very);??????cout?<<?"請輸入c++成績："?<<?endl;??????cin?>>?achieve;??????p->changegrade(achieve);??????system("cls");??????cout?<<?"信息輸入完畢"?<<?endl;????????for?(;?tail->getNext()?!=?'\0';)??????{??????????tail?=?tail->getNext();??????}????????tail->afterInsert(p);??}??????student?*findmege(student?*head)??{??loop:??????cout?<<?"1--按姓名查詢???????????2--按學號查詢??????????????q--返回上一級菜單"?<<?endl;??????char?p[5],?ptr[20];??????student?*mid?=?head;??????cin?>>?p;????????if?(p[0]?!=?'1'&&p[0]?!=?'2'&&p[0]?!=?'q'?||?strlen(p)>1)??????{??????????system("cls");??????????cout?<<?"對不起，你的輸入有誤，請重新輸入！"?<<?endl;??????????goto?loop;??????}????????switch?(p[0])??????{??????case?'1':??????{??????????system("cls");??????????cout?<<?"請輸入要查找的姓名："?<<?endl;??????????cin?>>?ptr;????????????for?(;?strcmp(ptr,?mid->stu_name)?!=?0;?mid?=?mid->getNext())??????????{??????????????if?(mid->getNext()?==?'\0')??????????????{??????????????????cout?<<?"對不起，你要查找的人不存在，請確認你的輸入是否正確！"?<<?endl;??????????????????goto?loop;??????????????}??????????}??????????return?mid;??????}??????case?'2':??????{??????????system("cls");??????????cout?<<?"請輸入您要查找的學號："?<<?endl;??????????cin?>>?ptr;??????????for?(;?strcmp(ptr,?mid->stu_num)?!=?0;?mid?=?mid->getNext())??????????{??????????????if?(mid->getNext()?==?'\0')??????????????{??????????????????cout?<<?"對不起，您要查找的內容不存在，請確認您的輸入是否正確！"?<<?endl;??????????????????goto?loop;??????????????}??????????}??????????return?mid;??????}??????case?'q':???????{??????????return?'\0';??????}??????default:??????{??????????system("cls");??????????cout?<<?"對不起，您的輸入有誤，請重新輸入！"?<<?endl;??????????goto?loop;??????}??????}??}??????void?delete_list(student?*head)??{??????student?*p?=?'\0';??????char?selet[4];??????system("cls");??????cout?<<?"在刪除前，系統會根據您的提示找到您要刪除的學生信息！"?<<?endl;??????p?=?findmege(head);??????if?(p?!=?'\0')??????{??????????cout?<<?"確認要刪除嗎（yes/任意鍵返回）"?<<?endl;??????????cin?>>?selet;????????????if?(strcmp(selet,?"yes")?==?0)??????????{??????????????for?(;?head->getNext()?!=?p;?head?=?head->getNext());??????????????head->afterDelete();??????????????system("cls");??????????????cout?<<?"該信息刪除成功！"?<<?endl;??????????}??????}??}??????void?change_info(student?*head)??{??????system("cls");??????cout?<<?"在您修改前，系統會根據您提供的信息找的您要修改的信息："?<<?endl;??????student?*p?=?'\0';????????float?achieve;??????p?=?findmege(head);??????if?(p?!=?'\0')??????{??????????cout?<<?"請輸入c++成績:"?<<?endl;??????????cin?>>?achieve;??????????p->changegrade(achieve);??????????system("cls");??????????cout?<<?"修改成功!"?<<?endl;??????}????}??????void?output(student?*head)??{??????system("cls");??????cout?<<?"1-查看指定學生信息；2-查看所有學生信息；3-分段輸出學生信息"?<<?endl;??????char?ch;??????int?n?=?0;??????head?=?head->getNext();??????cin?>>?ch;??????switch?(ch)??????{??????case?'1':???????????head?=?findmege(head);??????????if?(head?==?'\0')??????????{??????????????break;??????????}??????????head->getMage();??????????break;??????case?'2':???????while?(head)??????{??????????head->getMage();??????????head?=?head->getNext();??????}??????break;??????case?'3':???????????cout?<<?"a-60分以下；b-60~70分之間；c-70~80分之間；d-80~90分之間；e-90~100分之間："?<<?endl;??????????cin?>>?ch;??????????switch?(ch)??????????{??????????case?'a':??????????while?(head)??????????{??????????????if?(head->stu_score?<=?60)??????????????{??????????????????head->getMage();??????????????????n++;??????????????}??????????????head?=?head->getNext();??????????}???????????break;??????????case?'b':???????????while?(head)??????????{??????????????if?(head->stu_score>60?&&?head->stu_score?<=?70)???????????????{???????????????????head->getMage();??????????????????n++;???????????????}??????????????head?=?head->getNext();??????????}??????????break;??????????case?'c':???????????while?(head)??????????{??????????????if?(head->stu_score>70?&&?head->stu_score?<=?80)??????????????{???????????????????head->getMage();???????????????????n++;???????????????}??????????????head?=?head->getNext();??????????}??????????break;??????????case?'d':???????????while?(head)??????????{??????????????if?(head->stu_score>80?&&?head->stu_score?<=?90)??????????????{??????????????????head->getMage();??????????????????n++;??????????????}??????????????head?=?head->getNext();??????????}??????????break;??????????case?'e':???????????while?(head)??????????{??????????????if?(head->stu_score>90?&&?head->stu_score?<=?100)??????????????{???????????????????head->getMage();??????????????????n++;??????????????}??????????????head?=?head->getNext();??????????}??????????}??????????if?(n?==?0)??????????{??????????????cout?<<?"該分段內沒有您要找的學生信息"?<<?endl;??????????}??????}??}??????void?mainmenu(student?*head)??{??????char?selet[10];??????int?n?=?1;??????ofstream?outfile;??????ifstream?infile;??????student?*p,?*ptr;??????student?*test?=?head,?*mid;??????cout?<<?"*************************歡迎進入學生信息管理系統*************************"?<<?endl;??????do?{??????????cout?<<?"**************************************************************************"?<<?endl;??????????cout?<<?"1.插入信息；???2.刪除信息；??3.修改信息；?4.查看信息；?5.保存??"?<<?endl;??????????cout?<<?"按'q'鍵退出??????"?<<?endl;??????????cout?<<?"**************************************************************************"?<<?endl;??????????cin?>>?selet;??????????if?(((selet[0]<'1'?||?selet[0]>'6')?&&?selet[0]?!=?'q')?||?strlen(selet)>1)??????????{??????????????system("cls");??????????????cout?<<?"您的輸入有誤，請重新輸入！"?<<?endl;??????????????break;??????????}??????????switch?(selet[0])??????????{????????????case?'1':??????????????construct_list(head);??????????????break;???????????case?'2':???????????????delete_list(head);???????????????break;??????????case?'3':???????????????change_info(head);??????????????break;??????????case?'4':???????????????output(head);??????????????break;??????????case?'5':????????????????outfile.open("students.txt",?ios::out?|?ios::app);??????????????for?(p?=?head->getNext();?p?!=?'\0';?p?=?p->getNext())??????????????{??????????????????outfile?<<?p->stu_name?<<?'?';??????????????????outfile?<<?p->stu_num?<<?'?';??????????????????outfile?<<?p->stu_score?<<?'?';??????????????????outfile?<<?endl;??????????????}??????????????outfile.close();??????????????system("cls");??????????????cout?<<?"保存成功！"?<<?endl;??????????????break;??????????case?'q':???????????????break;??????????}??????}?while?(selet[0]?!=?'q');??}????void?main()??{??????student?head;??????mainmenu(&head);??}??
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