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%lf一般和double类型一起用，你想输出保留几位可以设置的，比如，printf("%.5lf",a)就是五位，但默认为6位小数输出。
实例：
static void ExGetRandom_PER1(void) //IM310 [persist.sys.tm.cpu]: [ARM Cortex-A7,528M]
{
int Random_len[] = {1,4096};
int iRet;
int i, j, N;
int cnt = 100;
int len;
char data[100][4096];
struct timeval tv;
unsigned long time1,time2,time3,time4,AllTime=0;
double AvgTime = 0;
char tmp[1024];
char CPUinfo[64]={0};
N = TellCPUInfo(CPUinfo);
time1 = 0;
time2 = 0;
time3 = 0;
time4 = 0;
for (i=0; i < ARRAY_SIZE(Random_len); i++)
{
len = Random_len[i];
printline_p(4, LEFT_P, "Random_len=%d", len);
gettimeofday (&tv, NULL);
time1 = tv.tv_sec;
time2 = tv.tv_usec;
for (j = 0;j < cnt;j++)
{
iRet = ExGetRandom(data[j], len);
ASSERT(iRet == RET_OK,"ExGetRandom fail! len=%d iRet=%d",len, iRet);
}
gettimeofday (&tv, NULL);
time3 = tv.tv_sec;
time4 = tv.tv_usec;
AllTime = (time3 - time1) * 1000000 + (time4 - time2); //得到时间单位为us(微秒)
AvgTime = AllTime / cnt;
ASSERT(AvgTime |