重新再学习C++的练习

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <vector>
#include <iterator>
#include <string>
#define DEBUGVAR(x) cout << #x << " = " << x << endl

using namespace std;

struct Record
{
string name;
string addr;
string phone;

Record(string n, string a, string p) {
name = n; addr = a; phone = p;
}
};

class DataSet
{
public:
DataSet();
~DataSet();

void Insert(Record r);
void Delete(string name);
void Show(string filter);
friend ostream & operator <<(ostream &os, const DataSet &ds);
private:
vector<Record> datas;
bool match_wildcard(const char *wild, const char *input);
};

DataSet::DataSet()
{
}

DataSet::~DataSet()
{
}

void DataSet::Insert(Record r)
{
datas.push_back(r);
}

void DataSet::Delete(string name)
{
for(vector<Record>::iterator pos = datas.begin(); pos < datas.end(); ++pos)
if (name == (*pos).name)
{
cout << "deleting record: " << name << endl;
datas.erase(pos);
}
}

void DataSet::Show(string filter)
{
for(vector<Record>::iterator pos = datas.begin(); pos < datas.end(); ++pos) {
if (match_wildcard(filter.c_str(), (*pos).name.c_str()))
copy(pos, pos+1, ostream_iterator<Record>(cout, ""));
}
}

bool DataSet::match_wildcard(const char *wild, const char* input)
{
const char *cp = 0L, *mp = 0;

while ((*input) && (*wild != '*')) {
if ((*wild != *input) && (*wild != '?')) {
return 0;
}
wild++;
input++;
}

while (*input) {
if (*wild == '*') {
if (!*++wild) {
return 1;
}
mp = wild;
cp = input+1;
} else if ((*wild == *input) || (*wild == '?')) {
wild++;
input++;
} else {
wild = mp;
input = cp++;
}
}
while (*wild == '*') {
wild++;
}
return !*wild;
}
ostream & operator <<(ostream &os, const Record &r)
{
os << r.name << '/t' << r.addr << '/t' << r.phone << endl;
return os;
}
ostream & operator <<(ostream &os, const DataSet &ds)
{
copy(ds.datas.begin(), ds.datas.end(),
ostream_iterator<Record>(cout, ""));
return os;
}

//////////////////////////////////////////////////////////////////////////////////////////////
#include "DataSet.h"

class QuerySystem
{
public:
QuerySystem();
int GetUserChoice();
void DisplayRecords();
void InsertRecord();
void DeleteRecord();
void FindRecords();

void Execute(int i);
private:
void (QuerySystem::*fptr[4])();
static char *menu[6];
DataSet ds;

void DisplayMenu();
string GetInput(string prompt);
};

char * QuerySystem::menu[] = {
"(1) Display table",
"(2) Append record",
"(3) Remove record",
"(4) Find records",
"(0) Exit Programme",
"" };

QuerySystem::QuerySystem()
{
fptr[0] = &QuerySystem::DisplayRecords;
fptr[1] = &QuerySystem::InsertRecord;
fptr[2] = &QuerySystem::DeleteRecord;
fptr[3] = &QuerySystem::FindRecords;
}

int QuerySystem::GetUserChoice()
{
DisplayMenu();
string s("");
while (s.size() != 1 || s[0] < '0' || s[0] > '4')
s = GetInput("Input your choice [0-4]");
return s[0] - '0';
}

void QuerySystem::DisplayMenu()
{
cout << endl << "============ Query System ============" << endl;
for (int i = 0; menu[i] != 0; i++) cout << '/t' << menu[i] << endl;
}

void QuerySystem::DisplayRecords()
{
cout << ds;
system("pause");
}

void QuerySystem::InsertRecord()
{
string name = GetInput("Input Name:");
string addr = GetInput("Input Address:");
string phone = GetInput("Input phone:");

ds.Insert(Record(name, addr, phone));
system("pause");
}

void QuerySystem::DeleteRecord()
{
string name = GetInput("Input name:");
ds.Delete(name);
system("pause");
}

void QuerySystem::FindRecords()
{
string name = GetInput("Input name (support ? or * search):");
ds.Show(name);
system("pause");
}

string QuerySystem::GetInput(string prompt)
{
string s;
cout << prompt << endl;
cin >> s;
return s;
}

void QuerySystem::Execute(int i)
{
if (i < 0 || i > 3) {
cerr << "Error Operation!" << endl;
exit(1);
}
(this->*fptr[i])();
}

//////////////////////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "QuerySystem.h"

int _tmain(int argc, _TCHAR* argv[])
{
QuerySystem qs;
int i;
while((i = qs.GetUserChoice()) != 0)
qs.Execute(i-1);
return 0;
}