linux C笔记

1、计算运行时间

struct timeval tv1;struct timezone tz1;struct timeval tv2;struct timezone tz2;gettimeofday( &tv1,  &tz1);//待测代码段gettimeofday( &tv2,  &tz2);printf("%ds %dus\n", (int)(tv2.tv_sec - tv1.tv_sec), (int)(tv2.tv_usec - tv1.tv_usec));