大学生成绩管理系统(c++版).cpp

一款用纯C语言编写的大学生成绩管理系统

#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
#include <fstream>


using namespace std;

string IDtofind;
bool menu1()
{
	cout<<"	Welcome to the Student Score MIS"<<endl;
	cout<<"************************ Main Menu* *************************"<<endl;
	cout<<"*      1.  Add Records         2.  Require Records          *"<<endl;
	cout<<"*      3.  Delete Records      4.  Modify Records           *"<<endl;
	cout<<"*      5.  Sort Records        6.  Save Records             *"<<endl;
	cout<<"*      7.  Load Records        8.  Exit                     *"<<endl;
	cout<<"*************************************************************"<<endl;
	return true;
}

bool menu2()
{
	cout<<"*********************Require Records ************************"<<endl;
	cout<<"*          1  Require Certain Record by Num               *"<<endl;   //9
	cout<<"*          2  Require All the Records                     *"<<endl;   //10
	cout<<"*          3  Back to MainMenu                            *"<<endl;
	cout<<"*************************************************************"<<endl;  //11
	return true;
}

bool menu3()
{
	cout<<"*********************Sort Records ****************************"<<endl;
	cout<<"*          1  Sort Records by Num                          *"<<endl;   //12
	cout<<"*          2  Sort Records by name                         *"<<endl;   //13
	cout<<"*          3  Sort Records by Average Score                *"<<endl;   //14
	cout<<"*          4  Back to MainMenu                             *"<<endl;   //15
	cout<<"**************************************************************"<<endl;
	return true;
}

struct student
{
	string ID;
	string name;
	double yuwen;
	double shuxue;
	double yingyu;
	double average;
};

bool sID(student a,student b)
{
	return a.ID>b.ID;
}

bool sName(student a,student b)
{
	return a.name<b.name;
}

bool sAver(student a,student b)
{
	return a.average>b.average;
}


class body
{
	vector<student> v;
public:
	bool add();
	bool del(string ID);
	vector<student>::iterator  findbyID(string ID);
	bool traverse();
	bool modify(string ID);
	bool sortbyID();
	bool sortbyName();
	bool sortbyAverage();
	bool load(string filename);
	bool save(string filename);
};


bool body::add()
{
	student temp;
	cout<<" add a record of student"<<endl<<"please input the name of student:"<<endl;
	cin>>temp.name;
	cout<<"please input the num:"<<endl;
	cin>>temp.ID;
	cout<<"please input the score of yuwen:"<<endl;
	cin>>temp.yuwen;
	cout<<"please input the score of shuxue:"<<endl;
	cin>>temp.shuxue;
	cout<<"please input the score of yingyu:"<<endl;
	cin>>temp.yingyu;
	temp.average=(temp.yingyu+temp.shuxue+temp.yuwen)/3;
	v.push_back(temp);
	return true;
}

bool body::del(string ID)
{
	vector<student>::iterator it;
	it=findbyID(ID);
	if(it==v.end())
	{
		cout<<"not found" <<endl;
		return false;
	}
	else
	{
		v.erase(it);
		return true;
	}
}

	


bool findID(student s)
{
	return s.ID==IDtofind;
}

vector<student>::iterator body::findbyID(string ID)
{
	IDtofind=ID;
	vector<student>::iterator temp;
	temp=find_if(v.begin(),v.end(),findID);
	student s;
	if(temp==v.end())
	{
		cout<<"not found"<<endl;
		return v.end();
	}
	else
	{
		s=(*temp);
		cout<<s.ID<<" "<<s.name<<" "<<s.yuwen<<" "<<s.shuxue<<" "<<s.yingyu<<" "<<s.average<<endl;
		return temp;
	}
}


bool body::traverse()
{
	int i;
	cout<<"Num\tName\tyuwen\tshuxue\tyingyu\taverage"<<endl;
	
	for(i=0;i<v.size();i++)
		cout<<v.at(i).ID<<"\t"<<v.at(i).name<<"\t"<<v.at(i).yuwen<<"\t"<<v.at(i).shuxue<<"\t"<<v.at(i).yingyu<<"\t"<<v.at(i).average<<endl;
	
	return true;
}


bool body::modify(string ID)
{
	vector<student>::iterator it;
	student temp;
	it=findbyID(ID);
	if(it==v.end())
	{
		cout<<"not found"<<endl;
		return false;
	}
	else
	{
		temp=(*it);
		cout<<" modify a record of student"<<endl<<"please input the new name of student:"<<endl;
		cin>>temp.name;
		cout<<"please input the new num:"<<endl;
		cin>>temp.ID;
		cout<<"please input the new score of yuwen:"<<endl;
		cin>>temp.yuwen;
		cout<<"please input the new score of shuxue:"<<endl;
		cin>>temp.shuxue;
		cout<<"please input the new score of yingyu:"<<endl;
		cin>>temp.yingyu;
		temp.average=(temp.yingyu+temp.shuxue+temp.yuwen)/3;
		v.at(it-v.begin())=temp;
		return true;
	}
}

bool body::sortbyID()
{
	sort(v.begin(),v.end(),sID);
	return true;
}

bool body::sortbyName()
{
	sort(v.begin(),v.end(),sName);
	return true;
}

bool body::sortbyAverage()
{
	sort(v.begin(),v.end(),sAver);
	return true;
}

bool body::load(string filename)
{
	fstream fp;
	fp.open(filename.c_str(),ios_base::in);
	int i,sum;
	student temp;
	fp>>sum;
	for(i=0;i<sum;i++)
	{
		fp>>temp.ID>>temp.name>>temp.yuwen>>temp.shuxue>>temp.yingyu;
		temp.average=(temp.yingyu+temp.shuxue+temp.yuwen)/3;
		v.push_back(temp);
	}

	fp.close();
	return true;
}

bool body::save(string filename)
{
	fstream fp;
	fp.open(filename.c_str(),ios_base::out);
	int i;
	student temp;
	fp<<v.size()<<endl;
	for(i=0;i<v.size();i++)
	{
		temp=v.at(i);
		fp<<temp.ID<<" "<<temp.name<<" "<<temp.yuwen<<" "<<temp.shuxue<<" "<<temp.yingyu<<endl;
	}

	fp.close();
	return true;
}



int main()
{
	
	body b;
	int input,add=0;
	string s;
	
	/*s="ab.txt";
	FILE *fp;
	fp=fopen(s.c_str(),"w");
	fprintf(fp,"%d",90);*/
	
	menu1();
	cin>>input;
	while(input!=8)
	{
		switch(input)
		{
		case 1:
			b.add();
			menu1();
			break;
		case 2:
			add=8;
			menu2();
			break;
		case 3:
			cout<<"please input the Num of the student to delete:"<<endl;
			cin>>s;
			b.del(s);
			menu1();
			break;
		case 4:
			cout<<"please input the Num of the student to modify:"<<endl;
			cin>>s;
			b.modify(s);
			menu1();
			break;
		case 5:
			add=11;
			menu3();
			break;
		case 6:
			cout<<"please input the filename to save:"<<endl;
			cin>>s;
			b.save(s);
			menu1();
			break;
		case 7:
			cout<<"please input the filename to load:"<<endl;
			cin>>s;
			b.load(s);
			menu1();
			break;
		case 9:
			cout<<"please input the Num of the student to require:"<<endl;
			cin>>s;
			b.findbyID(s);
			menu2();
			break;
		case 10:
			b.traverse();
			menu2();
			break;
		case 11:
			add=0;
			menu1();
			break;
		case 12:
			b.sortbyID();
			cout<<"OK"<<endl;
			menu3();
			break;
		case 13:
			b.sortbyName();
			cout<<"OK"<<endl;
			menu3();
			break;
		case 14:
			b.sortbyAverage();
			cout<<"OK"<<endl;
			menu3();
			break;
		case 15:
			add=0;
			menu1();
			break;
		default:
			break;
		}
		cin>>input;
		input+=add;
	}
	
	return 0;
}