getline()

Header: <string>

Function

The getline() function extracts characters from the input stream and appends it to the string object until the delimiting character is encountered.

Syntax

string str;
getline(cin,str);

Parameters

• str:  It is a string object, the input is stored in this object after being read from the stream.
• delim: It is the delimitation character which tells the function tostop reading further input after reaching this character.

E.g.

    string name;
    string city;
    cout << "Please enter your name: ";
    getline(cin, name);
    cout << "Enter the city you live in: ";
    getline(cin, city);
    cout << "Hello, " << name << endl;
    cout << "You live in " << city << endl;
/*
Please enter your name: John Doe  
Enter the city you live in: Chicago  
Hello, John Doe  
You live in Chicago
*/

未指定休止符的情况下，getline默认以换行符为休止符

对getline输入的str进行逐个字符的处理

header: <sstream>

code

   #include<sstream>//必须有
   
	string slist[100];
	
    //这三行的顺序绝对不能改变！否则无效
    string str;
    getline(cin,str);
	istringstream iss(str);//把str当作参数！

    int i=0;
    while(iss>>slist[i]){//注意箭头方向（输入到slist里作为第i个元素）
        i++;
    }
    /*至此,输入的一行的所有内容(包括空白符)都被储存到slist数组里面*/

==istringstream iss(str)==
1）记住, 前面有个i, 不是stringstream！(从iss的名字就能看出来)
2）记住, 是需要把str当作参数的！

实战

补充

another feasible method

string slist[100];
    stringstream  ss;
    string s;
    getline(cin,s);
    ss<<s;
    int i=0;
    while(ss>>slist[i]){
        i++;
    }

不用sstream也能操作str

![[Pasted image 20241029235637.png]]