C++14几种计时方法的对比-一一网

【摘要】 1.C++14 版本，程序如下：
#include<iostream>
#include<ctime>
#include<time.h>
#ifdef _WIN32
#include <Windows.h>
#else
#include <unistd.h>
#endif
using namespace std;

void disptime(const struct…

1.C++14 版本，程序如下：

#include<iostream>
#include<ctime>
#include<time.h>
#ifdef _WIN32
#include <Windows.h>
#else
#include <unistd.h>
#endif
using namespace std;

void disptime(const struct tm* ptm);
int main()
{
	time_t nowtime;
	nowtime = time(NULL);
	cout << nowtime << endl;
	char* dt = ctime(&nowtime);

	cout << "本地日期和时间：" << dt << endl;
	tm* gmtm = gmtime(&nowtime);
	dt = asctime(gmtm);
	cout << "utc日期和时间：" << dt << endl;

	tm* itm = localtime(&nowtime);
	cout << "年：" << 1900 + itm->tm_year << endl;
	cout << "月：" << 1 + itm->tm_mon << endl;
	cout << "日：" << itm->tm_mday << endl;
	cout << "时间：" << itm->tm_hour << ":";
	cout << itm->tm_min <<" :";
	cout << itm->tm_sec << endl; //方法1
	double beginTime = clock();
	Sleep(200); //ms
	double endTime = clock();
	cout << (endTime - beginTime)<<"ms" << endl; //方法2
	double start = GetTickCount(); //计时器
	Sleep(200);
	double end = GetTickCount();
	double last = end - start;
	cout << last << "ms" << endl;

	//方法3
	LARGE_INTEGER cpuFreq1;
	LARGE_INTEGER startTime1;
	LARGE_INTEGER endTime1;

	QueryPerformanceFrequency(&cpuFreq1);
	QueryPerformanceCounter(&startTime1);
	Sleep(200);
	QueryPerformanceCounter(&endTime1);
	double last1 = (((endTime1.QuadPart - startTime1.QuadPart) * 1000000) / cpuFreq1.QuadPart);
	cout << last1 << " us" << endl;

	return 0;
}
  
 
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59