把报错复制到网上，还是不知道要怎么修改。

Question

报错内容是这样的：error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'void' (or there is no acceptable conversion)

#include<iostream>
#include<string>
using namespace std;
class employee
{
   public:
       employee(char n,char c,int co)
       {
           name=n;
           city=c;
           code=co;
       }
       void setValue()
       {
          
        cin>>name>>city>>code;
       }
       void display()
       {
        cout<<"name:"<<name<<"city:"<<city<<"code:"<<code<<endl;
       }
   private:
       char name;
       char city;
       int code;
};
      int main()
      {
          employee g1(0,0,0);
          employee g2(0,0,0);
          employee *p;
          g1.setValue();
          p=&g1;
          cout<<"the content of g1:"<<p->display()<<endl;
          g2.setValue();
          p=&g2;
          cout<<"the content of g2:"<<p->display()<<endl;
          return 0;
      }

修改好了后又出现运行错乱的问题，是为啥，一开始没有用双引号也是这样。
好像发不了图片，不知道为啥

Answer 1

cout<< p->display()
这里要输出display()的返回值，但是你的display返回值是void，因此报错。
可以分开写或者重载<<操作符。