学生成绩管理系统，供大家参考，具体内容如下
一、问题描述及功能要求
（1）输入同学的学号，姓名，三门科成绩(应用数学、大学英语、计算机应用基础)
（2）可以计算出每个学生三门课的平均成绩。
（3）可通过输入姓名、学号查询成绩，也可通过姓名修改学生信息，也可通过主界面删除学生信息，以及清楚所有信息
二、代码实现 带有注释
废话不说，直接代码，欢迎指正。
大家CV可能有不兼容的情况，可以跟我滴滴，尽可能解决问题地回复。
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#include <cstdlib>#include <iostream>#include <string>using namespace std;#define null NULLclass student{ private: friend class studentMessage; student *next; //节点指针 string name; //学生姓名 int age; //年纪 int id; //学号 double score[3]; //三科成绩 double total; //总分 double average; //平均成绩 public: student(string _name,int _age,int _id,double *_score) { name = _name; age = _age; id = _id; score[0] = _score[0]; score[1] = _score[1]; score[2] = _score[2]; total = score[0]+score[1]+score[2]; average = total/3; next = NULL; } student() //为studentMessage初始化头结点用 { name = "null"; age = 0; id = 0; score[0]=score[1]=score[2]=0; total = 0; average = 0; next = NULL; } ~student(){} void swap(student*);};void student::swap(student *q){ string _name; int _age,_id; double _score[3],_total,_average; _name = name; name = q->name; q->name = _name; _age = age; age = q->age; q->age = _age; _id = id; id = q->id; q->id = _id; _score[0] = score[0]; score[0] = q->score[0]; q->score[0] = _score[0]; _score[1] = score[1]; score[1] = q->score[1]; q->score[1] = _score[1]; _score[2] = score[2]; score[2] = q->score[2]; q->score[2] = _score[2]; _total = total; total = q->total; q->total = _total; _average = average; average = q->average; q->average = _average;}class studentMessage{ private: student *first; //头指针 int num; //信息中的学生人数 public: studentMessage() { num = 0; //初始化学生人数为0 first = new student; //初始化头结点 } ~studentMessage(){delete first;} /*管理系统常规操作*/ void Insret(void); //插入 void Display(void); //显示 void Delete(void); //删除 void Search(void); //搜索 void Change(void); //改动 void sortByLesson1(void); //按成绩一来排序 void sortByLesson2(void); //按成绩二来排序 void sortByLesson3(void); //按成绩三来排序 void sortByTotal(void); //按总分来排序 void SearchByid(void); //按照学号查找 void SearchByname(void); //按照姓名查找 int menu(void); //初始的菜单 void clear(void); //清空列表};int studentMessage::menu(void){ int ch; cout<<"**********************************************************************"<<endl; cout<<"======================================================================"<<endl; cout<<"***************************学生成绩管理系统***************************"<<endl;cout<<endl; cout<<"1.显示所有学生成绩"<<endl; cout<<"2.添加学生信息"<<endl; cout<<"3.查询学生信息"<<endl; cout<<"4.修改学生信息"<<endl; cout<<"5.删除最下面一个学生信息"<<endl; cout<<"6.删除所有信息"<<endl; cout<<"0.退出系统"<<endl;cout<<endl; cout<<"********************Copyright@ By Jeaven Wong**************************"<<endl; cout<<"======================================================================="<<endl; cout<<"***********************************************************************"<<endl; cin >> ch; cout<<"\n\n\n"<<endl; return ch;}//插入void studentMessage::Insret(void){ string name; int age; int id; double score[3]; cout<<"请输入学生姓名: "; cin>>name; cout<<"请输入学生年龄: "; cin>>age; cout<<"请输入学生学号: "; cin>>id; cout<<"下面请输入学生三门课程成绩: "; cout<<endl; cout<<"请输入第一门课的成绩: ";cin>>score[0]; cout<<"请输入第二门课的成绩: ";cin>>score[1]; cout<<"请输入第三门课的成绩: ";cin>>score[2]; cout<<endl; student *newstu = new student(name,age,id,score); student *p = first; while(p->next != NULL) { p = p->next; } p->next = newstu; newstu->next = null; num++;}void studentMessage::Display(void){ if(num == 0) { cout<<"当前记录中无学生..."<<endl; } else { student *p = first->next; while(p != null) { cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"三门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; p = p->next; } }}void studentMessage::Delete(void){ student *p = first; student *pre = first; while(p->next != NULL) { pre = p; p = p->next; } pre->next = NULL; delete p; num--;}void studentMessage::Search(void){ int temp = 0; cout<<"请输入查找的条件，有如下选项..."<<endl; cout<<"按照学号查找（请输入【1】） 按照姓名查找（请输入【2】）"<<endl; cin>>temp; switch(temp) { case 1: SearchByid(); break; case 2: SearchByname(); break; default: cout<<"输入有误..."<<endl; }}void studentMessage::SearchByid(void){ int _id; int flag = 0; cout<<"请输入待查找学生的学号："; cin >> _id; student *p = first->next; while(p != null) { if(p->id == _id) { flag = 1; cout<<"下面是查找匹配结果："<<endl; cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"三门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; } p = p->next; } if(flag == 0) { cout<<"抱歉，记录中没有查找匹配项..."<<endl; }}void studentMessage::SearchByname(void){ string _name; int flag = 0; cout<<"请输入待查找的学生姓名: "; cin >> _name; student *p = first->next; while(p != null) { if(p->name == _name) { flag = 1; cout<<"下面是查找匹配结果："<<endl; cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"三门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; } p = p->next; } if(flag == 0) { cout<<"抱歉，记录中没有查找匹配项..."<<endl; }}void studentMessage::Change(void){ string _name; int flag = 0,temp; int _id,_age; int course = 0; cout<<"请输入需要改动信息的学生的姓名: "; cin >> _name; student *p = first->next; while(p != null) { if(p->name == _name) { flag = 1; cout<<"该学生当前信息如下："<<endl; cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"三门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; cout<<"请指明哪一项需要修改..."<<endl; cout<<"修改学号（输入【1】） 修改年龄（输入【2】）修改成绩（输入【3】）"<<endl; cin >> temp; switch(temp) { case 1: { cout<<"请输入新的学号：";cin>>_id; p->id = _id; } break; case 2: { cout<<"请输入新的年龄：";cin>>_age; p->age = _age; } break; case 3: { cout<<"请按指示修改课程成绩..."<<endl; cout<<"是否需要修改第一门课程成绩？（需要输入【1】不需要输入【0】）"<<endl; cin >> course; if(course == 1) { cout<<"请输入修改后的第一门课的成绩："; cin >> p->score[0]; } course = 0; cout<<"是否需要修改第二门课程成绩？（需要输入【1】不需要输入【0】）"<<endl; cin >> course; if(course == 1) { cout<<"请输入修改后的第二门课的成绩："; cin >> p->score[1]; } course = 0; cout<<"是否需要修改第三门课程成绩？（需要输入【1】不需要输入【0】）"<<endl; cin >> course; if(course == 1) { cout<<"请输入修改后的第三门课的成绩："; cin >> p->score[2]; } course = 0; p->total = p->score[0]+p->score[1]+p->score[2]; p->average = p->total/3; cout<<"修改后的信息如下： "<<endl; cout<<"姓名:"<<p->name<<" "; cout<<"年龄:"<<p->age<<" "; cout<<"学号:"<<p->id<<" "; cout<<"三门课程成绩: "<<p->score[0]<<" "<<p->score[1]<<" "<<p->score[2]<<" "; cout<<"总分:"<<p->total<<" "; cout<<"平均分:"<<p->average<<endl; } break; default: cout<<"输入有误..."<<endl; } } p = p->next; } if(flag == 0) cout<<"当前记录中没有次学生..."<<endl;}/*排序我均采用冒泡排序法，均是从小到大排序*///按照科目一排序void studentMessage::sortByLesson1(void){ student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->score[0] > q->score[0]) { p->swap(q); } q = q->next; } p = p->next; }}//按照科目二排序void studentMessage::sortByLesson2(void){ student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->score[1] > q->score[1]) { p->swap(q); } q = q->next; } p = p->next; }}//按照科目三排序void studentMessage::sortByLesson3(void){ student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->score[2] > q->score[2]) { p->swap(q); } q = q->next; } p = p->next; }}//按照总成绩排序void studentMessage::sortByTotal(void){ student *p = first->next; while(p->next != null) { student *q = p->next; while(q != null) { if(p->total > q->total) { p->swap(q); } q = q->next; } p = p->next; }}void studentMessage::clear(void){ student *p = first->next; while(p != null) { first->next = p->next; p->next = null; delete p; p = first->next; }}int main(){ studentMessage stulist; int ch; while(ch = stulist.menu()) { switch(ch) { case 1: stulist.Display(); break; case 2: stulist.Insret(); break; case 3: stulist.Search(); break; case 4: stulist.Change(); break; case 5: stulist.Delete(); break; case 6: stulist.clear(); break; default: cout<<"请按要求输入..."<<endl; } } return 0;} |
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原文链接：https://blog.csdn.net/m0_46525584/article/details/106967106
