Linux下测试程序运行时间

int gettimeofday(struct timeval tv,struct timezone *tz);
struct timeval {
int tv_sec;
int  tv_usec;
};

#include <time.h>
#include <stdio.h>
#include<sys/time.h>

int main(void)
{
struct timeval startTime,endTime;
float Timeuse;
int i,j;

gettimeofday(&startTime,NULL);
for(i =0;i <10;i++)
{
printf("Nice to see you\n");
for(j = 0;j <100; j++);
}

gettimeofday(&endTime,NULL);

Timeuse = 1000000*(endTime.tv_sec - startTime.tv_sec) + (endTime.tv_usec - startTime.tv_usec);

Timeuse /= 1000000;

printf("Timeuse = %f\n",Timeuse);
}