C++语法

cin.getline&cin.ignore

#include<iostream>
using namespace std;
int main()
{
	char buf[20];
	cin.ignore(5);
	cin.getline(buf,10);//相当只有9个，最后要'\0' 
	cout<<buf<<endl;
 } 

?cin.peek&cin.get

#include<iostream>
using namespace std;
int main()
{
	char p;
	cout<<"请输入一段文本:\n";
	while(cin.peek()!='\n')
	{
		p=cin.get();
		cout<<p;
	}
	cout<<endl;
 } 

cin.read&cin.gcoun

#include<iostream>
using namespace std;
int main()
{
	const int size = 50;
	char buf[size];
	cout<<"请输入一段文本:\n";
	cin.read(buf,20);
	
	cout<<"字符串收集到的字符数为："
		<<cin.gcount()<<endl;
	cout<<"输入的文本信息是：";
	cout.write(buf,20); 
	cout<<endl;
 }