键盘缓冲区残余信息问题



scanf(" c",&c) 这句不能正常接收字符,什么原因呢？我们用 printf("c= d\n",c) 将C用int表示出来，启用printf("c= d\n",c) 这一句，看看scanf()函数赋给C到底是 什么，结果是c=10 ,ASCII值为10是什么？换行即\n.对了，我们每击打一下"Enter"键，向键盘缓冲区发去一个“回车”(\r),一个“换行"(\n),在这里 \r被scanf()函数处理掉了（姑且这么认为吧^_^），而\n被scanf()函数“错误”地赋给了c.解决办法：可以在两个scanf()函数之 后加个fflush(stdin) ，还有加getch() , getchar()也可以，但是要视具体scanf()语句加那个，这里就不分析了，读者自己去摸索吧。但是加fflush(stdin) 不管什么情况都可行。

-Keyboard buffer residual information problems scanf ("　 c" , &　c)　sentence does not receive characters, what causes it? We use printf (" c =　d \ n" , c)　int represented by the C Enable printf (" c =　d \ n" , c)　this one, see scanf () function is assigned to C What in the end, the result is c = 10, ASCII value of 10 is what? Newline is \ n. Yes, we look at every hit " Enter"　key, the keyboard buffer sent a " carriage return"　(\ r), a " newline"　(\ n), where \ r is scanf ( ) function handles out (let so that it ^ _ ^), and \ n is scanf () function " error"　to assign a c. Solution: can two scanf () function then add fflush (stdin)　, as well as add getch (), getchar () can, but depending on the specific scanf () statement added that, there is not analyzed, the reader to explore it. But add fflush (stdin)　matter what conditions are feasible.