c program 一問

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
time_t now=time(NULL);
struct tm *tstr=localtime(&now);
printf("%s\n",asctime(tstr));
printf("%d/%d/%d %02d:%02d\n",tstr->tm_year+1900,tstr->tm_mon+1,tstr->tm_mday,
tstr->tm_hour,tstr->tm_min);
system("pause");
return 0;
}