getchar与cin混淆 [英] getchar confuses with cin(s)

问题描述

通常我们将一个getchar放在一个控制台应用程序的末尾，作为关闭程序的命令。

但是getchar混淆了cin命令我猜有时候我不得不放一个以上的getchar在计划结束时。比如下面，

我该如何解决？ （我的意思是我该怎么办才能在最后只有一个getchar？）

Usually we put a getchar at the end of a console application as a command to close the program.
But getchar confuse with cin orders i guess and sometimes i have to put more than just one getchar at the end of the program. such as below,
how should i fix it? (I mean what should i do to have only one getchar at the end?)

int main(){
	vector<int> numbers(0);
	cout << "please enter you numbers :::\n''entering any characters but numbers is the end of entry''\n";	
	int counter = 0;	
		do{			
			int newnumber = 0;
			cout << "element(" << counter << ") = ";
			counter++;
			cin >> newnumber;
			numbers.push_back(newnumber);
			if (cin.fail()){
				cout << "entered numbers are:\n";
				for (vector<int>::iterator i = numbers.begin(); i != numbers.end(); i++)
				{
					cout << *i;
					if (i != numbers.end()-1)cout << " - ";
				}				
			}
		} while (cin.good());
// here
		getchar(); getchar(); getchar();
}

推荐答案

问题是输入缓冲区中可能已经存在某些字符。

根据许多缓冲输入，你需要更多的getchar。

一个简单的解决方案就是循环，同时''\\ n''被事先调用，也可以缓冲：

The problem is that some characters may already be present in the input buffer.
Depending on many buffered inputs are there you need more getchar.
A simple solution is to loop while a '\n' is ecountered de facto empting also the buffer:

int c;
do
    c=getchar();
while (c!=EOF && c!='\n');

另一个非常经典的解决方案（来自DOS时代，但仍然有效）是：

Another really classic solution (coming from DOS times, but still working) is:

while(_kbhit())
    _getch();

使用后一种解决方案，你不需要在流缓冲区中有一个'\ n'。

With the latter solution you don't need to have a '\n' in the stream buffer.

使用 cin.get（）而不是。

我忘了MS允许在输入流上使用fflush（），所以这个简单的行应该这样做：

I forgot that MS allows the use of fflush() also on input streams, so this simple line should do:

fflush(stdin);

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