请问:
printf("please enter an int:");
while(scanf("%d",&n)!=1){
   while(getchar()!='\n')   ;
   printf("input incorrect.an int again");
}
for(i=0;i<n,++i)……
中的“while(getchar()!='\n')   ;”是什么意思？里面的“getchar()”指的是n的编码值还是程序另外要求输入的字符编码值？

You should read your programming books carefully instead of asking this simple question.

If I can find the answer in the books,I should not ask for help at here.I am learning this programming by myself,so I must ask others for help when I have answers.

Really?
Ho ho~
Please tell me the name of the book,I don't believe there's no explantion of "\n".
You haven't read the book carefully!

一堆鸟语！！（我们不懂英文的都这么说，没别的意思）
这里的getchar()是一个函数，用来输入一个字符。

while(getchar()!='\n')   ;
的意思是说当你输入的不是回车键（\n)，就执行while后的语句，
否则while循环结束。

Sorry,I konw the "'\n'",please look my answer carefully.

这是编程中国  不是编程英国

是啊,可是while后面是空格紧接着分号,什么意思???

Your discription is not clear.

Here are the words you wrote:
"里面的“getchar()”指的是n的编码值还是程序另外要求输入的字符编码值？"
I don't understand what you meant.