(1)
#include<stdio.h>
#include<time.h>
int main()
{
time_t time1=time(NULL);
time_t time2;
long long i=1;
while(833)
{
++i;
time2=time(NULL);
if(time2-time1>=5)break;
}
printf("%d",(int)i);
getchar();
}
输出345644470

2
#include<stdio.h>
#include<time.h>
int main()
{
time_t time1=time(NULL);
time_t time2;
long long i=1;
while(833)
{
i++;
time2=time(NULL);
if(time2-time1>=5)break;
}
printf("%d",(int)i);
getchar();
}
输出370580534
所以i++和++i效率并没有显著的区别

while(833)是什么鬼