【题目18】学生成绩管理系统
设计实现一个管理学生成绩的系统。
#include<iostream>
#include<fstream>
#include<set>
#include<map>
using namespace std;
struct Course
{
string CourseName;
string CourseCredit;
}course[100];
struct STC
{
string StudentName;
string CourseName;
int grade;
}stc[1000];
int Coursecount;
int Studentcount;
void menu();
void manage_course();
void grade_In();
void grade_search();
void grade_Analyse();
void grade_Sort();
void write_Course(Course course[],int n);
int read_Course(Course course[]);
int read_STC(STC stc[]);
void write_STC(STC stc[],int n);
void updataSTC(string CourseName);
void subject_sort(string CourseName);
void update_infor();
int main()
{
menu();
return 0;
}
void update_infor()
{
cout<<"--------------成绩修改--------------"<<endl;
cout<<"请输入学生姓名"<<endl;
string StudentName;
cin >> StudentName;
for(int i = 0;i < Coursecount ;i++)
{
if(stc[i].StudentName == StudentName)
{
cout<<"修改"<<stc[i].CourseName<<"成绩"<<endl;
int grade;
cin >> grade;
stc[i].grade = grade;
}
}
write_STC(stc,Studentcount);
menu();
}
void updataSTC(string CourseName)
{
Studentcount = read_STC(stc);
for(int i = 0;i<Studentcount;i++)
{
if(stc[i].CourseName == CourseName)
{
for(int j = i;j <= Studentcount-1;j++)
{
stc[j].StudentName= stc[j+1].StudentName;
stc[j].CourseName= stc[j+1].CourseName;
stc[j].grade= stc[j+1].grade;
}
Studentcount--;
}
}
write_STC(stc,Studentcount);
}
void write_Course(Course course[],int n)
{
fstream myFile;
myFile.open("course.txt", ios::out | ios::binary);
if (!myFile) {
cout << "course.txt can't open!" << endl;
abort();
}
int count = n;
myFile << count << endl<<endl;
for (int i = 0; i < count; i++) {
myFile << course[i].CourseName << "\t"
<< course[i].CourseCredit << endl;
}
myFile.close();
}
int read_Course(Course course[])
{
fstream myFile;
myFile.open("course.txt", ios::in | ios::binary);
if (!myFile) {
cout << "course.txt can't open!" << endl;
abort();
}
int count;
myFile.seekg(0);
myFile >> count;
for (int i = 0; i <= count; i++) {
myFile >> course[i].CourseName >> course[i].CourseCredit;
}
myFile.close();
return count;
}
void write_STC(STC stc[],int n)
{
fstream myFile;
myFile.open("stc.txt", ios::out | ios::binary);
if (!myFile) {
cout << "stc.txt can't open!" << endl;
abort();
}
int count = n;
myFile << count << endl<<endl;
for (int i = 0; i < count; i++) {
myFile << stc[i].StudentName << "\t"
<< stc[i].CourseName << "\t"
<< stc[i].grade<< endl;
}
myFile.close();
}
int read_STC(STC stc[])
{
fstream myFile;
myFile.open("stc.txt", ios::in | ios::binary);
if (!myFile) {
cout << "stc.txt can't open!" << endl;
abort();
}
int count;
myFile.seekg(0);
myFile >> count;
for (int i = 0; i <= count; i++) {
myFile >> stc[i].StudentName >> stc[i].CourseName >> stc[i].grade;
}
myFile.close();
return count;
}
void subject_sort(string CourseName)
{
cout<<endl;
cout<<CourseName<<"的排名:"<<endl;
map<double,string> maps;
for(int i = 0;i<Studentcount;i++)
{
if(stc[i].CourseName == CourseName)
{
maps[stc[i].grade] = stc[i].StudentName;
}
}
for(map<double,string>::reverse_iterator it=maps.rbegin();it!=maps.rend();it++)
{
cout<<it->second<<"\t\t";
cout<<it ->first<<endl;
}
menu();
}
void manage_course()
{
cout<<"--------------管理课程信息-------------"<<endl;
cout<<" 1 查看课程信息"<<endl;
cout<<" 2 添加课程信息"<<endl;
cout<<" 3 删除课程信息"<<endl;
cout<<" 4 修改课程信息"<<endl;
cout<<" 5 退出"<<endl;
cout<<"---------------------------------------"<<endl;
int choose;
cin >> choose;
switch(choose)
{
case 1:
{ cout<<"--------------查看课程信息-------------"<<endl;
cout<<"课程名"<<"\t\t"<<"课程学分"<<endl;
Coursecount = read_Course(course);
for(int i = 0;i < Coursecount;i++)
{
if(course[i].CourseName.length()<8)
{
cout<<course[i].CourseName<<"\t"<<"\t"<<course[i].CourseCredit<<endl;
}
else
{
cout<<course[i].CourseName<<"\t"<<course[i].CourseCredit<<endl;
}
}
manage_course();
}
case 2:
{
cout<<"--------------添加课程信息-------------"<<endl;
int flag = 1;
while(flag)
{
cout<<"请输入课程名"<<endl;
string CourseName;
cin >> CourseName;
cout<<"请输入课程学分"<<endl;
string CourseCredit;
cin >> CourseCredit;
course[Coursecount].CourseName = CourseName;
course[Coursecount++].CourseCredit = CourseCredit;
cout<<"是否继续输入（y/n）"<<endl;
string c;
cin >> c;
if(c=="y")
{
flag = 1;
}else if(c=="n"){
flag = 0;
}else{
cout<<"选项不存在，退出"<<endl;
flag = 0;
}
}
write_Course(course,Coursecount);
manage_course();
}
case 3:
{
cout<<"--------------删除课程信息-------------"<<endl;
cout<<"请输入删除的课程的名称"<<endl;
string CourseName;
cin>>CourseName;
for(int i = 0;i < Coursecount;i++)
{
if(course[i].CourseName==CourseName)
{
if(i == Coursecount-1)
{
Coursecount--;
cout<<"删除"<<CourseName<<"成功"<<endl;
break;
}
for(int j = i;j < Coursecount-1;j++)
{
course[j].CourseName=course[j+1].CourseName;
course[j].CourseCredit=course[j+1].CourseCredit;
}
Coursecount--;
cout<<"删除"<<CourseName<<"成功"<<endl;
break;
}
}
write_Course(course,Coursecount);
updataSTC(CourseName);
manage_course();
}
case 4:
{
cout<<"--------------修改课程信息-------------"<<endl;
cout<<"请输入修改的课程的名称"<<endl;
string CourseName;
cin>>CourseName;
cout<<"请输入修改的课程的学分"<<endl;
string CourseCredit;
cin >> CourseCredit;
for(int i = 0;i < Coursecount ;i++)
{
if(course[i].CourseName==CourseName)
{
course[i].CourseCredit=CourseCredit;
cout<<"修改"<<CourseName<<"成功"<<endl;
break;
}
}
write_Course(course,Coursecount);
manage_course();
}
case 5:
{
menu();
return ;
}
default: break;
}
}
void menu()
{ Coursecount = read_Course(course);
cout<<"------------学生成绩管理系统-----------"<<endl;
cout<<" 1 管理课程信息"<<endl;
cout<<" 2 学生课程成绩录入"<<endl;
cout<<" 3 成绩查询"<<endl;
cout<<" 4 成绩汇总"<<endl;
cout<<" 5 成绩排序"<<endl;
cout<<" 6 课程排序"<<endl;
cout<<" 7 学生课程成绩修改"<<endl;
cout<<" 8 退出"<<endl;
cout<<"---------------------------------------"<<endl;
int choose;
cin >> choose;
switch(choose)
{
case 1:
{
manage_course();
break;
}
case 2:
{
grade_In();
break;
}
case 3:
{ Studentcount = read_STC(stc);
grade_search();
break;
}
case 4:
{ Studentcount = read_STC(stc);
grade_Analyse();
break;
}
case 5:
{
Studentcount = read_STC(stc);
grade_Sort();
break;
}
case 6:
{
Studentcount = read_STC(stc);
cout<<"--------------课程排序--------------"<<endl;
cout<<"请输入查看的课程名称"<<endl;
string CourseName;
cin >> CourseName;
subject_sort(CourseName);
break;
}
case 7:
{
Studentcount = read_STC(stc);
update_infor();
break;
}
case 8:
{
cout<<"欢迎下次使用"<<endl;
exit(0);
break;
}
default: break;
}
}
/*
set 统计人名
map 进行汇总排序
*/
void grade_Sort()
{
cout<<"--------------成绩排序--------------"<<endl;
set<string> s;
map<double,string> maps;
for(int i = 0;i<Studentcount;i++)
{
s.insert(stc[i].StudentName);
}
set<string>::iterator it;
for(it=s.begin();it!=s.end();it++)
{
double temp = 0;
for(int i = 0;i<Studentcount;i++)
{
if(*it == stc[i].StudentName)
{
temp += stc[i].grade;
}
}
maps[temp] = *it;
}
cout<<"成绩单\t\t";
for(int i = 0;i < Coursecount;i++)
{
if(course[i].CourseName.length()<8)
{
cout<<course[i].CourseName<<"\t"<<"\t";
}
else
{
cout<<course[i].CourseName<<"\t";
}
}
cout<<"平均分"<<endl;
for(map<double,string>::reverse_iterator it=maps.rbegin();it!=maps.rend();it++)
{
cout<<it->second<<"\t\t";
for(int i = 0;i<Studentcount;i++)
{
if(it->second == stc[i].StudentName)
{
cout<<stc[i].grade<<"\t\t";
}
}
cout<<(it->first)/Coursecount<<endl;
}
menu();
}
/*
set 统计人名
遍历统计
*/
void grade_Analyse()
{
cout<<"--------------成绩汇总--------------"<<endl;
cout<<endl;
cout<<"--------学生成绩单---------"<<endl;
set<string> s;
for(int i = 0;i<Studentcount;i++)
{
s.insert(stc[i].StudentName);
}
set<string>::iterator it; //定义前向迭代器
//中序遍历集合中的所有元素
cout<<endl;
cout<<"成绩单\t\t";
for(int i = 0;i < Coursecount;i++)
{
if(course[i].CourseName.length()<8)
{
cout<<course[i].CourseName<<"\t"<<"\t";
}
else
{
cout<<course[i].CourseName<<"\t";
}
}
cout<<"平均分"<<endl;
for(it=s.begin();it!=s.end();it++)
{ cout<<*it<<"\t\t";
double temp = 0;
for(int i = 0;i<Studentcount;i++)
{
if(*it == stc[i].StudentName)
{
cout<<stc[i].grade<<"\t\t";
temp += stc[i].grade;
}
}
cout<<temp/Coursecount<<endl;
}
menu();
}
void grade_search()
{
cout<<"--------------成绩查询--------------"<<endl;
cout<<"请输入学生姓名"<<endl;
string StudentName;
cin >> StudentName;
int flag = 0;
for(int i = 0;i<Studentcount;i++)
{
if(stc[i].StudentName == StudentName)
{
flag = 1;
break;
}
}
if(flag)
{
cout<<StudentName<<"的成绩单"<<endl;
}else
{
cout<<"无该学生信息"<<endl;
menu();
}
for(int i = 0;i<Studentcount;i++)
{
if(stc[i].StudentName == StudentName)
{
if(course[i%Coursecount].CourseName.length()<8)
{
cout<<course[i%Coursecount].CourseName<<"\t"<<"\t"<<stc[i].grade<<endl;
}
else
{
cout<<course[i%Coursecount].CourseName<<"\t"<<stc[i].grade<<endl;
}
}
}
menu();
}
void grade_In()
{
cout<<"--------------学生课程成绩录入--------------"<<endl;
int flag = 1;
while(flag)
{
cout<<"请输入学生姓名"<<endl;
string StudentName;
cin >> StudentName;
for(int i = 0;i<Coursecount;i++)
{ stc[Studentcount].StudentName = StudentName;
cout<<"请输入"<<course[i].CourseName<<"的成绩"<<endl;
stc[Studentcount].CourseName = course[i].CourseName;
int grade;
cin >> grade;
stc[Studentcount++].grade = grade;
}
cout<<"是否继续输入（y/n）"<<endl;
string c;
cin >> c;
if(c=="y")
{
flag = 1;
}else if(c=="n"){
flag = 0;
}else{
cout<<"选项不存在，退出"<<endl;
flag = 0;
}
}
/*
cout<<"记录："<<Studentcount<<endl;
for(int i = 0;i<Studentcount;i++)
{
cout<<stc[i].StudentName<<" "<<stc[i].CourseName<<" "<<stc[i].grade<<endl;
}
*/
write_STC(stc,Studentcount);
menu();
}
设计要求：
(1) 实现学生课程信息的管理；
(2) 实现学生课程成绩的录入管理。
(3) 实现各类统计信息的输出到文件；
(4) 实现基于成绩的各类查询、汇总、排序；