cin.peek & cin.get & cin.gcount & cin.read

Stream object cin

cin >> i;
// extract an integer from the input stream object cin at a time

cin.ignore (n); // Ignore the previous n characters
cin.getline (a, m, 'n'); // Receive the m characters of the a string, stop when the character n

#include<iostream>
using namespace std;

int main()
{
	char buf[20];
	cin.ignore(7);
	cin.getline(buf,10,'5');
	
	cout<<buf<<endl;
}

Input: 12222222354
Output: 23

cin.peek (); // The return value is a char character
cin.get (); // Receive a line of string or a character

cin.get(ch,10);//接收ch字符串的前十个
cin.get(ch);接收ch的第一个

cin.gcount();//
cin.read();//

#include<iostream>
using namespace std;

int main()
{
	const int i=50;
	char buf[i];
	
	cout<<"输入文本：";
	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;
	
	return 0; 
}

Input text: ahhhhhhhhhhhhhhhhhhhhhhhhhh The
number of characters collected by the string is: 20
The text information entered is: ahhhhhhhhhhhhhhhhhhhh