C++ Exercises（十二）
钱能《C++程序设计教材》P14 日期数据存在在文件中，格式如下面所示，若年，月，日加起来等于15，则收集，然后按日期从小到大的顺序打印出来 Sample Input: 03-11-12 03-08-12 04-08-11 02-07-06 Sample Output: 02年07月06日 03年08月04日
1,c++版本 #include <fstream> #include <iostream> #include <string> #include <vector> #include <algorithm> using namespace std;
//日期类 class Date { private: string year;//年 string month;//月 string day;//日 public: Date(string strYear,string strMonth,string strDay):year(strYear),month(strMonth),day(strDay) { } ~Date() { } string Year()const { return year; } string Month()const { return month; } string Day()const { return day; } };
//用于比较日期 class LessThan { public: bool operator ()(const Date* date1,const Date* date2) { if(date1->Year()<date2->Year()) { return true; } else if(date1->Month()<date2->Month()) { return true; } else if(date1->Day()<date2->Day()) { return true; } else return false; } };
//日期文件 class DateContainer { private: static const string fileName; vector<Date*> m_dates; public: DateContainer() { } ~DateContainer() { vector<Date*>::iterator iter; for(iter=m_dates.begin();iter!=d();++iter) { delete (*iter); } m_dates.clear(); }
bool ProcessDate() {//读数据 ifstream infile(DateContainer::fileName.c_str()); if(!infile) { return false; } string tmpLine; while(infile>>tmpLine) { //读一行数据 int firstPos = tmpLine.find_first_of('-');//第一个'-' int lastPos = tmpLine.find_last_of('-');//第二个'-' string strOne = tmpLine.substr(0,2);//第一个域 string strTwo = tmpLine.substr(firstPos+1,2);//第二个域 string strThree = tmpLine.substr(lastPos+1,2);//第三个域 int year,month,day; year = ProcessField(strOne); month = ProcessField(strTwo); day = ProcessField(strThree); if(IsValidRecord(year,month,day)) {//符合要求，保存此记录 Date* date = new Date(strOne,strTwo,strThree); m_dates.push_back(date); } } sort(m_dates.begin(),d(),LessThan());//排序 printDates(); return true; }
int ProcessField(string& field) {//处理各个域 if(field[0]=='0') { return field[1]-'0'; } else { return (field[0]-'0')*10+(field[1]-'0'); } } bool IsValidRecord(int first,int second ,int third) {//是否合法记录 return (first+second+third)==15; } void printDates() {//遍历输出 vector<Date*>::iterator iter; for(iter=m_dates.begin();iter!=d();++iter) { cout<<(*iter)->Year()<<"年"<<(*iter)->Month()<<"月"<<(*iter)->Day()<<"日"<<endl; } }
};
const string DateContainer::fileName = "D:\";//数据文件
int main() { DateContainer container; //读取数据 if(!container.ProcessDate()) { cout<<"error"<<endl; return -1; } system("pause"); return 0; }
2，C#版：
using System; using System.Collections.Generic; using System.Text; using System.Collections; using System.IO;
namespace ConsoleApplication1 { //日期类 class Date : IComparable { private String year;//年 private String month;//月 private String day;//日 public Date(String strYear,String strMonth,String strDay) { ar = strYear; h = strMonth; this.day = strDay; }
public String Year { get { return year; } } public String Month { get { return month; } } public String Day { get { return day; } } public int CompareTo(object obj) { if (obj is Date) { Date otherDate = (Date)obj; if (this.Year != otherDate.Year) { return this.Year.CompareTo(otherDate.Year); } else if (this.Month != otherDate.Month) { return this.Month.CompareTo(otherDate.Month); } else if (this.Day != otherDate.Day) { return this.Day.CompareTo(otherDate.Day); } else return 0; } else { throw new ArgumentException("object is not a Date"); }
} }
//日期文件 class DateContainer { private const String fileName = "D:\"; private ArrayList m_dates = new ArrayList(); public DateContainer() { } public bool ProcessDate() {//读数据
StreamReader din = File.OpenText(fileName); String tmpLine;
while ((tmpLine = din.ReadLine()) != null) { //读一行数据 int firstPos = tmpLine.IndexOf('-');//第一个'-' int lastPos = tmpLine.LastIndexOf('-');//第二个'-' String strOne = tmpLine.Substring(0, 2);//第一个域 String strTwo = tmpLine.Substring(firstPos + 1, 2);//第二个域 String strThree = tmpLine.Substring(lastPos + 1, 2);//第三个域 int year, month, day; year = ProcessField(strOne); month = ProcessField(strTwo); day = ProcessField(strThree); if (IsValidRecord(year, month, day)) {//符合要求，保存此记录 Date date = new Date(strOne, strTwo, strThree); m_dates.Add(date); } }
m_dates.Sort(); printDates(); return true; }
public int ProcessField(String field) {//处理各个域 if(field[0]=='0') { return field[1]-'0'; } else { return (field[0]-'0')*10+(field[1]-'0'); } } public bool IsValidRecord(int first,int second ,int third) {//是否合法记录 return (first+second+third)==15; } public void printDates() {//遍历输出 foreach (Date date in m_dates) { System.Console.WriteLine("{0}年{1}月{2}日", date.Year, date.Month, date.Day); } }
} class Program { static void Main(string[] args) { DateContainer container = new DateContainer(); container.ProcessDate(); } } }
3，java版:
import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.io.BufferedReader; import java.io.FileReader; import java.io.FileNotFoundException; import java.io.IOException;
//日期类 class MyDate { private String year;//年 private String month;//月 private String day;//日 public MyDate(String strYear,String strMonth,String strDay) { ar = strYear; h = strMonth; this.day = strDay; } public String getDay() { return day; } public String getMonth() { return month; } public String getYear() { return year; } } // 用于比较日期 class LessThan implements Comparator { public int compare(Object o1, Object o2) { MyDate date1 = (MyDate)o1; MyDate date2 = (MyDate)o2; Year()!&#Year()) { Year()Year()); } else if (Month() != Month()) { Month()Month()); } else if (Day() != Day()) { Day()Day()); } else return 0; }
}
//日期文件 class DateContainer { private final String fileName = "D:\"; private ArrayList<MyDate> m_dates = new ArrayList();
public DateContainer() { } @SuppressWarnings("unchecked") public boolean ProcessDate() {//读数据
FileReader fr = null; BufferedReader br = null; StringBuffer sBuffer = new StringBuffer(); try { try { fr = new FileReader(fileName);// 建立FileReader对象，并实例化为fr } catch (FileNotFoundException e) { e.printStackTrace(); } br = new BufferedReader(fr);// 建立BufferedReader对象，并实例化为br String tmpLine = br.readLine();// 从文件读取一行字符串 // 判断读取到的字符串是否不为空 while (tmpLine != null) { int firstPos = tmpLine.indexOf('-');//第一个'-' int lastPos = tmpLine.lastIndexOf('-');//第二个'-' String strOne = tmpLine.substring(0, 2);//第一个域 String strTwo = tmpLine.substring(firstPos + 1, lastPos);//第二个域 String strThree = tmpLine.substring(lastPos + 1, tmpLine.length());//第三个域 int year, month, day; year = ProcessField(strOne); month = ProcessField(strTwo); day = ProcessField(strThree); if (IsValidRecord(year, month, day)) {//符合要求，保存此记录 MyDate date = new MyDate(strOne, strTwo, strThree); m_dates.add(date); } tmpLine = br.readLine();// 从文件中继续读取一行数据 } } catch (IOException e) { e.printStackTrace(); } finally { try { if (br != null) br.close();// 关闭BufferedReader对象 if (fr != null) fr.close();// 关闭文件 } catch (IOException e) { e.printStackTrace(); } } Comparator comp = new LessThan(); Collections.sort(m_dates, comp); printDates(); return true; }
public int ProcessField(String field) {//处理各个域 if(field.charAt(0)=='0') { return field.charAt(1)-'0'; } else { return (field.charAt(0)-'0')*10+(field.charAt(1)-'0'); } } public boolean IsValidRecord(int first,int second ,int third) {//是否合法记录 return (first+second+third)==15; } public void printDates() {//遍历输出 for (MyDate date :m_dates) { System.out.Year()+"年"+ Month()+"月"+ Day()+"日"); } }
}
public class DateDemo { public static void main(String[] args) throws IOException { // TODO Auto-generated method stub DateContainer container = new DateContainer(); container.ProcessDate(); ad();
}
}
本文转自Phinecos(洞庭散人)博客园博客，原文链接：.html，如需转载请自行联系原作者
