Question

error: expected primary-expression before '<<' token错误

#include<iostream>
#include<string>
using namespace std;

int main()
{
string user_name;

cout <<"Please enter your name:";
cin >>user_name;

switch ( user_name.size() ){
case 0:
cout<<"Ah,the user with no name."
<<"Well,ok,hi,user with no name\n";
break;
case 1:
cout<<"A 1-character name? Hmm,have you read Kafka?:";
<<"hello,"<< user_name <<endl;
break;

default:
//字符串长度超过一个字符
cout <<"hello, " << user_name
<<" --happy to make your acquaintance!\n";
break;
}
return 0;
}

Answer 1

要么去掉分号，改成如下：
cout<<"A 1-character name? Hmm,have you read Kafka?:"
<<"hello,"<< user_name <<endl;
要么改成如下：
cout<<"A 1-character name? Hmm,have you read Kafka?:" ;
cout <<"hello,"<< user_name <<endl;