#include<iostream>
using namespace std;

void main()
{
int i;
cin>>i;//1
cin>>i;//2
}

如果第一次输入出现异常（比如第一次输入时敲入一个char型字符），则第二次不能输入。如何解决此问题？

[QUOTE]
#include<iostream>
using namespace std;

void main()
{
int i;
cin>>i;//1
cin.clear();
cin.ignore(100,'\n');
cin>>i;//2
}
[/QUOTE]

#include<iostream>
using namespace std;

void main()
{
int i;
cin>>i;//1
cin.clear();
cin.ignore(100,'\n');
cin>>i;//2
}
红色的那句什么意思呀

谢谢了!

不过cin.clear()与cin.ignore(100.'\n')的作用是什么?

clear() resets the stream status flags. For example, when the stream
encounters an error (e.g. it wants to read an int and you give it
non-numeric characters), it sets a failure flag. Even after you skip over
the bad data with ignore() you can't continue reading until you reset the
flags with clear().

you shold first clear the error status,then ignore the bad data in the buffer.

为什么我第一次输入一个a
第二次还能输入啊

cin.clear()就相当于把i的内容清空了，相当于再次定义了一个i当然可以再次输入了
cin.ignore()
是指忽略

The function getline(cin,buffer) can also flush the buffer of istream.