ANSI C標(biāo)準(zhǔn)庫: <time.h>下函數(shù)講解

//time.t下的函數(shù).#include <iostream>#include <time.h>#include <windows.h>#include <vector>using namespace std;#pragma warning(disable:4996)//重要函數(shù)./*1.time_t time(0);       //返回的是從1970.1.1凌晨0點(diǎn)到當(dāng)前時(shí)間的秒數(shù).2.tm* localtime(time_t*);   //把秒數(shù)轉(zhuǎn)化為具體的時(shí)間.tm是一個(gè)結(jié)構(gòu)體.具體成員可以右鍵，然后轉(zhuǎn)到定義~3.double difftime(time_t t1, time_t t2);    //比較兩個(gè)time_t對(duì)象的差異.也就是相差的秒數(shù).4.char* ctime(const time_t*);   //把time_t對(duì)象轉(zhuǎn)化為一段字符串.5.time_t mktime(struct tm* );   //把一個(gè)具體時(shí)間轉(zhuǎn)化為一個(gè)秒數(shù).6.clock_t clock();              //相當(dāng)于一個(gè)時(shí)鐘,兩個(gè)clock_t對(duì)象的差值，代表間隔的時(shí)間，單位是毫秒，更精確了.*/ int main() {    //第一個(gè)例子:    time_t s = time(0);     //time(0)返回的是從1970.1.1凌晨0點(diǎn)到當(dāng)前時(shí)間的秒數(shù)，它是一個(gè)一直在變化的值.    cout << s << endl;    //第二個(gè)例子:    /*tm *temp = localtime(&s);    int hour = temp->tm_hour;   //幾點(diǎn).    int minute = temp->tm_min;  //幾分.    int month = temp->tm_mon;   //幾月    int week = temp->tm_wday;   //周幾.0代表周日.    int year = temp->tm_year + 1900;    //幾年.    int second = temp->tm_sec;  //幾秒.    int day = temp->tm_mday;    //幾天.    cout << year << "/" << month << "/" << day << "/" << hour << ":" << minute << ":" << second << " " << "星期" << week << endl;    cout << __DATE__ << " " <<  __TIME__ << endl;       //當(dāng)然關(guān)于時(shí)間，也可以用C語言的宏來體現(xiàn).同樣非常的快.*/    //第三個(gè)例子:    /*time_t s = time(0);    //間隔3000毫秒.    Sleep(3000);    time_t temp = time(0);    cout << difftime(temp, s) << endl;*/    //第四個(gè)例子:    /*time_t s = time(0);    //把秒數(shù)轉(zhuǎn)換為字符串.    char *q = ctime(&s);    cout << q << endl;*/    //第五個(gè)例子:    /*clock_t temp = clock();    vector<int> w;    for (int i = 0; i < 1000000; ++i)    {        w.push_back(i);    }    clock_t s = clock();    //兩個(gè)時(shí)鐘之差為間隔的時(shí)間.單位是毫秒!!!    cout << s - temp << endl;*/    system("pause");    return 0; }