application.cpp

简易学生管理系统,有删除添加查找编辑修改等功能

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstring>
#include "Application.h"

using namespace std;

void Application::PrintMenu() const
{
	cout << "**************简易学生信息管理系统**************" << endl;
	cout << setfill(' ');
	cout << setw(14) << "" << "0、退出整个系统" << endl;
	cout << setw(14) << "" << "1、添加学生的信息" << endl;
	cout << setw(14) << "" << "2、查找学生信息：已知学号" << endl;
	cout << setw(14) << "" << "3、查找学生信息：已知姓名" << endl;
	cout << setw(14) << "" << "4、修改学生信息：已知学号" << endl;
	cout << setw(14) << "" << "5、修改学生信息：已知姓名" << endl;
	cout << setw(14) << "" << "6、对学生成绩排序" << endl;
	cout << setw(14) << "" << "7、保存学生信息到文件中" << endl;
	cout << setw(14) << "" << "8、从文件中读入学生信息" << endl;	
	cout << "************************************************" << endl;
}

void Application::Process()
{
	unsigned int id;
	char name[80];

	cout << "请输入功能序号: " << endl;
	char ch = cin.get(); //getchar();
	cout << endl;
	switch(ch) {
	case '0':
		cout << "您选择的是: 退出整个系统!" <<endl;		
		exit(0);
	case '1':
		cout << "您选择的是: 添加学生信息!" <<endl;
		Add();
		break;
	case '2':
		cout << "您选择的是: 根据学号查找学生信息!" <<endl;		
		cout << "Please enter id:";
		cin >> id;
		Find(id);
		break;
	case '3':
		cout << "您选择的是: 根据姓名查找学生信息!" <<endl;		
		cout << "Please enter name:";
		cin.getline(name, 80);
		Find(name);		
		break;
	case '4':
		cout << "您选择的是: 根据学号修改学生信息!" <<endl;		
		cout << "Please enter id:";
		cin >> id;
		Update(id);	
		break;
	case '5':
		cout << "您选择的是: 根据姓名修改学生信息!" <<endl;		
		cout << "Please enter name:";
		cin.getline(name, 80);
		Update(name);	
		break;
	case '6':
		cout << "您选择的是: 按学生成绩排序!" <<endl;
		Sort();
		break;
	case '7':
		cout << "您选择的是保存学生信息到文件中!" <<endl;
		Save();
		break;
	case '8':
		cout << "您选择的是从文件中载入学生信息!" <<endl;
		Load();
		break;
	default:
		cout << "输入有误!" << endl;
	}
	cout << endl;
	getchar();
}

int Application::GetResponse() const
{	
	while (true) {
		cout << "按回车键继续, q键或者x键退出!" << endl;
		char ch = cin.get(); //getchar();
		if (ch == '\n') {
			system("cls");
			return 1;
		}
		else if (ch == 'q' || ch == 'Q' || ch == 'x' || ch == 'X')
			return 0;
	}
}

void Application::Add()
{
	cout << "Here to add one student-information." << endl;
}

int Application::Find(char *name)
{
	for (int i = 0; i < stuNumber; ++i) {
		if (stricmp(name, s[i].name) == 0) {
			cout << "Just Find him!" << endl;
			return i;
		}
	}
	return -1;
}

int Application::Find(unsigned int id)
{
	for (int i = 0; i < stuNumber; ++i) {
		if (id == s[i].id) {
			cout << "Just Find him!" << endl;
			return i;
		}
	}
	return -1;
}

void Application::Update(char *name)
{
	int idx = Find(name);
	if (idx == -1) {
		cout << name << "doesnot exist." << endl;
		cout << "would you like add him?" << endl;
		Add();
		return;
	}

	cout << "Just Update his information." << endl;
}

void Application::Update(unsigned int id)
{
	int idx = Find(id);
	if (idx == -1) {
		cout << id << "doesnot exist." << endl;
		cout << "would you like add him?" << endl;
		Add();
		return;
	}

	cout << "Just Update his information." << endl;
}

void Application::Sort()
{
	for (int i = 0; i < stuNumber - 1; ++i) {
		for (int j = i + 1; j < stuNumber; ++j) {
			if (s[i] < s[j]) {
				Student t = s[i];
				s[i] = s[j];
				s[j] = t;
			}
		}
	}
}

void Application::Save()
{
	cout << "Just save all information." << endl;

	ofstream ofs("Student.txt");
	if (!ofs) {
		cout << "Error: failed to open file." << endl;
		exit(1);
	}

	int i = 0;
	while (ofs && i < stuNumber) {
		ofs.write((char*)&s[i], sizeof(s[i]));
		++i;
	}
	ofs.close();
}

void Application::Load()
{
	cout << "Just load all information." << endl;
	

	ifstream ifs("Student.txt");
	if (!ifs) {
		cout << "Error: failed to open file." << endl;
		exit(1);
	}

	int i = 0;
	while (ifs && i < stuNumber) {
		ifs.read((char*)&s[i], sizeof(s[i]));
		++i;
	}
	ifs.close();
}