C++ 实现简单命令行学生管理系统
预览：
编译环境是macOS。system(“clear”) 在windows下请换成 system(“cls”)
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdlib>
using namespace std;
class Student {
public:
static int ENGSUM;
static int CHISUM;
static int MATSUM;
explicit Student(string &Nname,string &NID,string &Neng,string &Nchi,string &Nmat)
:name(Nname),ID(NID),eng_score(Neng),chi_score(Nchi),math_score(Nmat)
{ sumup();}
const string& getID() const{ return ID; }
const string& getName() const{ return name; }
const string& getEng() const{ return eng_score; }
const string& getChi() const{ return chi_score; }
const string& getMat() const{ return math_score; }
const int getsum() const{ return scores_sum; }
void changeEng(string &newEng){ eng_score = newEng; }
void changeChi(string &newChi){ chi_score = newChi; }
void changeMat(string &newMat){ math_score = newMat; }
void changeSum(int value){ scores_sum += value; }
void sumup(){
int e = stoi(eng_score); int c = stoi(chi_score); int m = stoi(math_score); scores_sum = e+c+m;
}
private:
string name;
string ID;
string eng_score;
string chi_score;
string math_score;
int scores_sum;
};
int Student::ENGSUM = 0;
int Student::CHISUM = 0;
int Student::MATSUM = 0;
Student* __lookup(vector<Student *>& stus,string &target);
void launcher();
void display(int currentSize);
void append(vector<Student *>& stus);
Student* displaySingleInfo(vector<Student *>& stus,string target);
void change(vector<Student *>& stus);
void del(vector<Student *>& stus);
void search(vector<Student *>& stus);
void quitSys(vector<Student *>& stus);
void displayAllInfos(vector<Student *>& stus);
void error(char choice);
bool comp(const Student* a,const Student* b){
return a->getsum()>b->getsum();
}
int main(){
launcher();
cout<< "再见" << endl;
return 0;
}
void launcher(){
vector<Student *> stus;
string _input;
display(static_cast<int>(stus.size()));
while(cin>>_input){
char choice = _input.at(0);
system("clear");
switch(choice){
case 'A':append(stus);
break;
case 'B':change(stus);
break;
case 'C':del(stus);
break;
case 'D':search(stus);
getchar();
break;
case 'E':displayAllInfos(stus);
getchar();
break;
case 'Q':quitSys(stus);
return;
default: error(choice);
getchar();
break;
}
system("clear");
display(static_cast<int>(stus.size()));
}
}
void display(int currentSize){
cout << "\n\n --------------------------------------------------------------------------------" << endl;
cout << "| ~~~ 输入Q退出系统 ~~~" << endl;
cout << " --------------------------------------------------------------------------------" << endl;
cout << "|\n";
cout << "| * 正在运行学生管理系统 *" << endl;
cout << "|\n";
cout << " --------------------------------------------------------------------------------" << endl;
cout << "|" << endl;
cout << "| * 已记录" << currentSize << "个学生的档案 * * 你还可以录入" << 100 - currentSize
<< "个学生 *" << endl;
cout << "|\n";
cout << " --------------------------------------------------------------------------------" << endl;
cout << "|\n";
cout << "| 接下来，你想进行什么操作? (输入对应序号)" << endl;
cout << "|\n";
cout << "| (A).添加 (B).修改 (C).删除 (D).查找 (E).查看所有学生档案" << endl;
cout << "|\n";
cout << " --------------------------------------------------------------------------------" << endl;
cout<< "--> ";
}
void append(vector<Student *>& stus){
cout << "\n\n好的，现在开始添加学生: \n\n";
cout << "请输入新学生的姓名、学号、英语成绩、语文成绩、数学成绩\n\n"
<< "例如: 小明 1704010625 129 120 134\n";
cout << " ------------------------------------------------------" << endl;
cout<< "--> ";
string n,i,e,c,m;
cin >> n >> i >> e >> c >> m;
Student *newStu = new Student(n,i,e,c,m);
stus.push_back(newStu);
Student::ENGSUM += stoi(e); Student::CHISUM += stoi(c); Student::MATSUM += stoi(m);
}
void change(vector<Student *>& stus){
cout << "\n\n好的，现在开始进行修改操作: \n\n";
cout << "请输入需要修改的学生的学号： \n"<<endl;
cout<< "--> ";
string target;
cin >> target;
Student *temp = displaySingleInfo(stus,target);
bool conti = true;
while(temp != nullptr && conti == true){
cout << "\n你想改动" << temp->getName() << "的哪个成绩？" << endl;
cout << "(A).English (B).Chinese (C).Math" << endl;
cout << "--> ";
string _input;
cin >> _input;
char ch = _input.at(0);
string tmp;
if(ch == 'A'){
cout << "请输入新的英语成绩： ";
cin >> tmp;
int sub = stoi(tmp) - stoi(temp->getEng());
temp->changeSum(sub);
Student::ENGSUM += sub;
temp->changeEng(tmp);
}else if(ch == 'B'){
cout << "请输入新的语文成绩： ";
cin >> tmp;
int sub = stoi(tmp) - stoi(temp->getChi());
temp->changeSum(sub);
Student::CHISUM += sub;
temp->changeChi(tmp);
}else{
cout << "请输入新的数学成绩： ";
cin >> tmp;
int sub = stoi(tmp) - stoi(temp->getMat());
temp->changeSum(sub);
Student::MATSUM += sub;
temp->changeMat(tmp);
}
cout << "\n\n------------------------------------------------------------\n搞定.输入y继续修改，输入n返回菜单\n";
cout << "--> ";
string t;
cin >> t;
if(t.at(0)=='y')
conti = true;
else conti = false;
cout << conti << endl;
if(conti)
temp = displaySingleInfo(stus,target);
}
if(temp == nullptr)
cout << "未查找到，按enter返回!";
}
void del(vector<Student *>& stus){
cout << "\n\n好的，现在开始进行删除操作: \n\n";
cout << "请输入需要删除的学生的学号： \n"<<endl;
cout<< "--> ";
string target;
cin >> target;
vector<Student *>::iterator it;
bool findIt = false;
for(it = stus.begin();it != stus.end();){
if((*it)->getID() == target){
findIt = true;
Student::ENGSUM -= stoi((*it)->getEng());
Student::CHISUM -= stoi((*it)->getChi());
Student::MATSUM -= stoi((*it)->getMat());
it = stus.erase(it);
break;
}else
++it;
}
if(!findIt)
cout << "未查找到，请重试！" << endl;
}
void search(vector<Student *>& stus){
cout << "\n\n好的，现在开始进行查找操作: \n\n";
cout << "请输入需要查找的学生的学号： \n"<<endl;
cout<< "--> ";
string target;
cin >> target;
displaySingleInfo(stus,target);
cout<< "按下enter键以继续" <<endl;
getchar();
}
void quitSys(vector<Student *>& stus){
vector<Student *>::iterator it;
for(it = stus.begin();it != stus.end();it ++){
delete (*it);
}
}
Student* displaySingleInfo(vector<Student *>& stus,string target)
{
Student *temp = __lookup(stus,target);
if(temp != nullptr){
cout << "\n学生姓名：" << temp->getName() << " 学号：" << temp->getID() << endl;
cout<< "--scores:"<<endl;
cout << "English: " << temp->getEng() << " Chinese: " << temp->getChi()
<< " Math: " << temp->getMat() << endl << endl;
}else{
cout << "未查找到，请重试！" << endl << endl; //TODO
return nullptr;
}
return temp;
}
void displayAllInfos(vector<Student *>& stus){
int rank = 1;
int len = static_cast<int>(stus.size());
sort(stus.begin(),stus.end(),comp);
cout<< "\n\n\n------------------------------------------------------------\n";
cout<< " scores\n";
cout<< "rank "<<"Name "<<"ID "<<"English "<<"Chinese "<< "Math "<<"Sum \n";
for(auto &stu : stus){
cout.setf(ios::left);
cout.width(6); cout<<rank++;
cout.width(14); cout<< stu->getName();
cout.width(13); cout<< stu->getID();
cout.width(9); cout<< stu->getEng();
cout.width(9); cout<< stu->getChi();
cout.width(6); cout<< stu->getMat();
cout<< stu->getsum()<<endl;
}
cout<< "\nsum ";
cout.width(9); cout<<Student::ENGSUM;
cout.width(9); cout<<Student::CHISUM;
cout.width(6); cout<<Student::MATSUM<<endl;
cout<< "average ";
cout.width(9); cout<<Student::ENGSUM/len;
cout.width(9); cout<<Student::CHISUM/len;
cout.width(6); cout<<Student::MATSUM/len;
cout<< "\n------------------------------------------------------------\n\n";
cout<< "按下enter键以继续" <<endl;
getchar();
}
Student* __lookup(vector<Student *>& stus,string &target){
vector<Student *>::iterator it;
Student *ptr = nullptr;
for(it = stus.begin();it != stus.end();it ++){
if((*it)->getID() == target){
ptr = (*it); break;
}
}
return ptr;
}
void error(char choice){
cout<< "\n------------------------------------------------------------\n\n";
cout << "抱歉，无选项 "<<choice<<" ,请重试。" << endl;
cout<< "\n按下enter键返回" <<endl;
cout<< "\n------------------------------------------------------------\n\n";
getchar();
}