c++ io流 学习心得（一） 

 1 #include<std_lib_facilities.h>
 2 int main()
 3 {
 4     int n;
 5     cin>>n;
 6     /*if (cin.fail())
 7         cin.clear();*/
 8     if(!cin)
 9         cout<<"asf";
10     system("pause");
11 }
12

clear()will chang the condition of stream to good().This part of date's input and output are as follows：
input：as//not int

output：asd//cin is fail

 1 #include<std_lib_facilities.h>
 2 int main()
 3 {
 4     int n;
 5     cin>>n;
 6     if (cin.fail())
 7         cin.clear();
 8     if(!cin)
 9         cout<<"asf";
10     system("pause");
11 }
12

when we uncomment the region and do not chang the input,there won't be any output.


 

posted @ 2012-03-10 19:03  windynightst  阅读(213)  评论(0)    收藏  举报