使用gettimeofday测试函数运行的时间

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

#define NEW_TIME_VALE
    struct timeval startTime,endTime;  \
    float Timeuse;\

#define START_GETTIME \
    gettimeofday(&startTime,NULL);  \

#define END_GETTIME \
    gettimeofday(&endTime,NULL);  \
    Timeuse = *(endTime.tv_sec - startTime.tv_sec) + (endTime.tv_usec - startTime.tv_usec);  \
    Timeuse /= ;  \
    printf("Timeuse = %f\n",Timeuse);\

void main()
{
    NEW_TIME_VALE
    START_GETTIME

    sleep();

    END_GETTIME
}