peek（）

#include <iostream>
using namespace std;
char GetChar(istream&in=cin)
{
	char ch;
	while(in.peek()!=EOF&&(ch=cin.get())==' ');
	//cout<<"ch="<<ch<<endl;
	return ch;
}

int main()
{
	char ch;
	cout<<"请输入一行字符串："<<endl;
	ch=GetChar();
	while(ch!='\n'&&ch!=EOF)
	{
		cout.put(ch);
		ch=GetChar();
	}
	cout<<endl;
	
	system("PAUSE");
	return 0;
}