求 difftime 算法、源码

[dading_105]

最近在单片机上求2个时间的差，希望能找到一种可靠的、稳定、高效的算法，望高手指点

[dading_105]

已经看了\vc7\crt\src\gmtime.c，基本已经搞定了，谢谢各位

[王集鹄]

参考
http://blog.yesky.com/372/Keying/1636872.shtml

[jixingzhong]

#include “stdio.h”
#include “stdlib.h”
#include “time.h”

int main( void )
{
long i = 10000000L;
clock_t start, finish;
double duration;
/* 测量一个事件持续的时间*/
printf( "Time to do %ld empty loops is ", i );
start = clock();
while( i-- )
finish = clock();
duration = (double)(finish - start) / CLOCKS_PER_SEC;
printf( "%f seconds\n", duration );
system("pause");
}

[jixingzhong]

http://zhanjun.net/?q=node/11