C语言跨平台时间操作计算时间差

#pragma once
#if defined(_WIN32)

#include<sys/timeb.h>

#if defined(UNIX)||defined(APPLE)

#include<time.h>

#endif
typedef long long long_time_t;
long_time_t TimeInMillisecond(void) {

#if defined(_WIN32)

struct timeb time_buffer;

ftime(&time_buffer);

return time_buffer.time1000LL+time_buffer.millitm;

#elif defined(UNIX)||defined(APPLE)

struct timeval time_value;

gettimeofday(&time_buffer,NULL);

return time_buffer.tv_sec1000LL+time_buffer.tv_usec/1000;

#elif defined(STDC)&&STDC__VERSION==201112L

struct timespec timespec_value;

timespec_get(&timespec_value,TIME_UTC);

return timespec_value.tv_sec1000LL+timespec_value.tv_nsec/1000;

#else

time_t current_time = time(NULL);

return current_time1000LL;

#endif

}

#endif

#include<stdio.h>

#include<time.h>

#include"../include/io_utils.h"

#include"../include/time_utils.h"

int main()

{

clock_t start_time = clock();

for(int i = 0;i<100;++i)

printf("hello world!");

clock_t end_time = clock();

PRINT_DOUBLE((end_time-start_time)*1.0/CLOCKS_PER_SEC);

return 0; 

}