c++ getline()和istringstream

来源：互联网发布：windows中国官方网编辑：程序博客网时间：2024/06/07 09:51

istringstream对象可以绑定一行字符串，然后以空格为分隔符把该行分隔开来。

#include<iostream>#include<sstream>using namespace std;int main(){string str, line;while(getline(cin, line)){istringstream stream(line);while(stream>>str)cout<<str.c_str()<<endl;}return 0;}/*input：abc   df   e              efgeg      ffgouput：abcdfeefgegffg*/

C++中有两个getline函数，这两个函数分别定义在不同的头文件中。

1.getline()是定义在<string>中的一个行数，用于输入一行string，以enter结束。

函数原型：getline(cin,str);
cin: istream类的输入流对象
str: 待输入的string对象

example 1:

//istringstream对象可以绑定一行字符串，然后以空格为分隔符把该行分隔开来。//《C++ primary plus》第四章编程练习题1#include <iostream>#include <string>using namespace std;string fname;string lname;char grade;int age;int main(){   cout<<"What is your first name?"<<endl;   getline(cin,fname);   cout<<"What is your last name?"<<endl;   getline(cin,lname);   cout<<"What letter grade do you deserve?"<<endl;   cin>>grade;   cout<<"What is your age?"<<endl;   cin>>age;   cout<<"Name:"<<lname<<","<<fname<<endl<<"Grade:"   <<grade<<endl<<"Age:"<<age<<endl;   return 0;}

cin.getline(char ch[],size)是cin 的一个成员函数，定义在<iostream>中，用于输入行指定size的字符串，以enter结束。若输入长度超出size，则不再接受后续的输入。

example 2:

//《C++ primary plus》第四章编程练习题1#include <iostream>using namespace std;char fname[5];char lname[5];char grade;int age;int main(){    cout<<"What is your first name?"<<endl;    cin.getline(fname,5);    cout<<"What is your last name?"<<endl;    cin.getline(lname,5);    cout<<"What letter grade do you deserve?"<<endl;    cin>>grade;    cout<<"What is your age?"<<endl;    cin>>age;    cout<<"Name:"<<lname<<","<<fname<<endl<<"Grade:"<<grade<<endl<<"Age:"<<age<<endl;    return 0;}

0 0