([keys count] > 0) ? [keys count] : 1 什么意思,主要是这问号和引号一起什么作用,以前学过的想不起来了

([keys count] > 0) ? [keys count] : 1 什么意思,主要是这问号和引号一起什么作用,以前学过的想不起来了 count(0)和count(*)哪个效率高? count(0)和count(*)哪个效率高? 解释一下COUNT'0') count count COUNT count count count count for (count=MAX_NUMBER+1; count!=0; count--) 这句什么意思 void send(void) { uchar count; bitmsb=x; for(count=0;count int[] a = {1,2,3,4,5}; for (int count = 0; count < 5; count++) System.out.print(a[count++]);那个a[count++]是什么意思? C语言一道题目int count = 3;int main() {int i,sum = 0; for(i = 0,sum = 0;i < count;i += 2,count++){static int count = 4;printf(i = %d,count = %d,i,count);sum += count++;printf( count = %d,sum = %d ,count,sum);}sum += count++;printf(count = php里 for（$count=1;$row=$result->fetch_row();++$count）{ $url_array[$count]=$row[0]}这段话是什么意 n=n>=(count-1)?0: if (ds.Tables[0].Rows.Count >