"Thinkinginc++" 48, using the time function in standard C library to generate a simple class

Cpptime.h

/*** book: "thinkinginc++" * Function: Generate a simple time class with the temporal function in the standard C library * Time: September 11, 2014 07:53:56* Author: cutter_point*/#ifndef cpptime_h_ Included#define cpptime_h_included#include<ctime> #include <cstring>//here CTime and CString are not including using  namespace Std; h is in C, which contains the using namespace std;/* and the direct storage date is a structure: struct tm{int tm_sec;  /* seconds, normal range 0-59, but allowed to 61* int tm_min; /* minutes, 0-59* int tm_hour; /* hours, 0-23* int tm_mday;  /* Day, that is, the first day of the one months, 1-31* int Tm_mon;    /* month, starting from January, 0-11*//*1+p->tm_mon;  int tm_year;    /* years, from 1900 to now how many years * 1900+ p->tm_year; int tm_wday; /* Week, Day of the week, starting from Sunday, 0-6* int tm_yday; /* FROM January 1 this year to the current number of days, range 0-365* int tm_isdst;  /* Daylight saving Time flag *};*/#include <iostream>class time{std::time_t t;  time_t is a type time_t this type is used to store the number of seconds from 1970 to now Std::tm Local;    TM is a struct char asciirep[26];    unsigned char Lflag, aflag;            void Updatelocal () {if (!lflag) {/* struct tm* gmtime (const time_t *TIMEP); Converts the time represented by time_t to a time that has not elapsed time zone conversion, is a struct TMstruct pointer, struct tm* localtime (const time_t *TIMEP);            Similar to Gmtime, but it is time-zone-converted.            time_t This type is used to store the number of seconds from 1970 to now, this function is to convert the second to the time we can understand * * Local=*std::localtime (&AMP;T);        ++lflag;            }} void Updateascii () {if (!aflag) {updatelocal ();            /* Char *asctime (const struct tm* timeptr);        Converts the information in the structure to the real-world time, displaying strcpy (char*, string/char*) as a string, copying the second string to the first top *// std::cout<< "???"            <<std::endl;            std::strcpy (Asciirep, Std::asctime (&local));        ++aflag;    }}public:time () {mark ();}        void Mark () {lflag=aflag=0;  Std::time (&t);    Get the system Time time_t times (time_t *t), and get the number of seconds since January 1, 1970.        } const char* ASCII ()//Returns a const char* type of data {updateascii ();    return asciirep;  } int Delta (time* DT) const//This const indicates that the function cannot change the member data of the class {      /* Oubledifftime (time_t time1, time_t time2);    Returns the number of seconds in a two-time difference */return INT (std::d ifftime (T, dt->t));        } int daylightsaving () {updatelocal (); int tm_isdst;    Daylight saving time flag return LOCAL.TM_ISDST;  }/* and the direct storage date is a structure: struct tm{int tm_sec;  /* seconds, normal range 0-59, but allowed to 61* int tm_min; /* minutes, 0-59* int tm_hour; /* hours, 0-23* int tm_mday;  /* Day, that is, the first day of the one months, 1-31* int Tm_mon;    /* month, starting from January, 0-11*//*1+p->tm_mon;  int tm_year;    /* years, from 1900 to now how many years * 1900+ p->tm_year; int tm_wday; /* Week, Day of the week, starting from Sunday, 0-6* int tm_yday; /* FROM January 1 this year to the current number of days, range 0-365* int tm_isdst;        /* Daylight saving time flag *};*/int dayofyear () {//int tm_yday;/* FROM January 1 this year to the current number of days, Range 0-365* updatelocal ();    return local.tm_yday;        } int DayOfWeek () {//int tm_wday;/* week, Day of the week, starting from Sunday, 0-6* updatelocal ();    return local.tm_wday;  } int since1900 () {//int tm_year; /* years, from 1900 to now how many years * 1900+ p->tm_year;       Updatelocal ();    return local.tm_year;  } int month () {//int tm_mon;        /* month, starting from January, 0-11*//*1+p->tm_mon;        Updatelocal ();    return Local.tm_mon;        } int DayOfMonth () {//int tm_mday;/* day, that is, the first day of the one month, 1-31 updatelocal ();    return local.tm_mday;        } int Hour () {//int tm_hour;/* hours, 0-23* updatelocal ();    return local.tm_hour;  } int minute () {//int tm_min;        /* minutes, 0-59* updatelocal ();    return local.tm_min;  }//int tm_sec;        /* seconds, normal range 0-59, but allowed to 61* int second () {updatelocal ();    return local.tm_sec; }}; #endif//cpptime_h_included

Cpptime.cpp

/*** book: "thinkinginc++" * Function: Test C + + Time class * Time: September 11, 2014 07:54:38* Author: cutter_point*/#include "Cpptime.h" #include < Iostream>using namespace Std;int Main () {time    start;    for (int i=1; i<5000; ++i)    {        cout<<i<< ";        if (i%10 = = 0)            cout<<endl;    }    Time End;    cout<<endl;    cout<< "start =" <<start.ascii () <<endl;    cout<< "end =" <<end.ascii () <<endl;    cout<< "Delta =" <<end.delta (&start) <<endl;    return 0;}

"Thinkinginc++" 48, using the time function in standard C library to generate a simple class