二进制表达式（'；std:：#u1:：ostream'；（又称'；basic#ostream<；char>；'；）和'；void'；）的操作数无效 我在Mac上使用Eclipse来运行C++程序。我是C++新手，尝试用不同的班级来学习作文。我面临下面的代码的问题。

Main.cpp

#include <iostream>
using namespace std;
#include "Birthday.h"
#include "People.h"

int main() {
    cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
    Birthday obj(25,3,1993);
    obj.print();
    People pp(5,obj);
    pp.printinfo();
    return 0;
}

#include <iostream>
using namespace std;
#include "Birthday.h"
//#include "People.h"

Birthday::Birthday(int d,int m,int y){
    // TODO Auto-generated constructor stub
    date =d;
    month=m;
    year=y;
}

void Birthday::print()
        {

          cout <<date << month<<year<<endl;
        }

#include "People.h"
#include <iostream>
using namespace std;
#include "Birthday.h"
#include<string>
People::People(int x,Birthday bb)
:xx(x),bo(bb)
{
    // TODO Auto-generated constructor stub

}

void People::printinfo()
{

cout<< xx<<bo.print(); //I am getting error because of this line , as soon as i comment it program compiles fine.
}

人。cpp

#include <iostream>
using namespace std;
#include "Birthday.h"
#include "People.h"

int main() {
    cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
    Birthday obj(25,3,1993);
    obj.print();
    People pp(5,obj);
    pp.printinfo();
    return 0;
}

#include <iostream>
using namespace std;
#include "Birthday.h"
//#include "People.h"

Birthday::Birthday(int d,int m,int y){
    // TODO Auto-generated constructor stub
    date =d;
    month=m;
    year=y;
}

void Birthday::print()
        {

          cout <<date << month<<year<<endl;
        }

#include "People.h"
#include <iostream>
using namespace std;
#include "Birthday.h"
#include<string>
People::People(int x,Birthday bb)
:xx(x),bo(bb)
{
    // TODO Auto-generated constructor stub

}

void People::printinfo()
{

cout<< xx<<bo.print(); //I am getting error because of this line , as soon as i comment it program compiles fine.
}

#包括“People.h”
#包括
使用名称空间std；
#包括“生日.h”
#包括
人物：：人物（整数x，生日bb）
：xx（x），bo（bb）
{
//TODO自动生成的构造函数存根
}
作废人员：：打印信息（）
{
我能建议你向你的（或合适的替代者）解释一下你的代码吗.print

函数真正的功能是什么？cout@Someprogrammerdude..它没有任何特定的功能。它只是试图打印在constructor@ChrisUzdavinis.嘿，谢谢你，克里斯，现在一切正常。我想这是唯一的问题。