获取当前系统时间，并以y-m-dh:m:s 显示 在虚拟机完成

include <time.h>

include <stdio.h>

include<unistd.h>

intmain()
{
while(1)
//1.先获取时间
time_t val = time(NULL);
//2.转换时间struct tm * ptm = localtime(&val);
//3.输出时间
printf( "%d-%d-%d %d:%d:%.2d\rIn", ptm->tm year+1900,ptm->tm_ mon+1, ptm->tm_ mday, ptm->tm hour,ptm->tm_ min, ptm->tm_ sec);
//4.时间间隔sleep(1);
}