C++错误:与“<< Rover::getName(）(）”中的数据“中的”运算符<<“不匹配

我正在为我的C++类编写一些代码，但我有点卡住了。

这是我正在处理的作业的一部分：

在 Rover 类中，指定以下成员实例变量：

 name (String)
 x position on a grid (integer)
 y position on a grid (integer)
 direction by compass – N, S, E, or W (String)
 speed (0 – 5 meters per second, integer)

在 Rover 类中，指定以下方法：

 No-arg constructor – set the rover’s position to (0,0), its speed to 0, 
  its direction to North,and its name to Default
 Constructor that receives parameters to initialize all five 
  instance variables described above
 Setter methods for each instance variable
 Getter methods for each instance variable
 getRoverData – returns a string that displays values for each instance 
  variable of the current rover object, placing each value on a separate line, 
  as follows:

所以现在我只想让基本情况起作用。这是我的全部代码：

主.cpp：

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

int main() {
    Rover rover1;
    rover1.setDefaultValues();
    cout<<rover1.getRoverData(rover1)<<endl;
    return 0;
}

漫游车.cpp：

#include <iostream>
#include "Rover.h"
using namespace std;
//put functions in here
void Rover::setDefaultValues() {
    name = "Default";
    xcoord = 0;
    ycoord = 0;
    direction = "N";
    speed = 0;
}
void Rover::constructRover() {
}
void Rover::setXcoord(int xcoord) {
    this->xcoord = xcoord;
}
void Rover::setYcoord(int ycoord) {
    this->ycoord = ycoord;
}
void Rover::setName(string name) {
    this->name = name;
}
void Rover::setDirection(string direction) {
    this->direction = direction;
}
void Rover::setSpeed(int speed) {
    this->speed = speed;
}
int Rover::getXcoord() {
    return xcoord;
}
int Rover::getYcoord() {
    return ycoord;
}
string Rover::getName() {
    return name;
}
string Rover::getDirection() {
    return direction;
}
int Rover::getSpeed() {
    return speed;
}
string Rover::getRoverData(Rover rover) {
    string printStatement = "";
    printStatement.append("Data for " << rover.getName());
    printStatement.append("nX: " << Rover::xcoord);
    printStatement.append("nY: " << Rover::ycoord);
    printStatement.append("nDirection: " << Rover::direction);
    printStatement.append("nSpeed: " << Rover::speed);
    return printStatement;
}

罗孚：

/* 
 * File:   Rover.h
 * Author: Matthew
 *
 * Created on May 14, 2012, 8:10 PM
 */

#ifndef ROVER_H
#define ROVER_H
using namespace std;

class Rover
{
        private:
            string name;
            int xcoord;
            int ycoord;
            string direction;
            int speed;

    public:
            void setDefaultValues();
            void constructRover();
            //XCoordinates
            void setXcoord(int xcoord);
            int getXcoord();
            //YCoordinates
            void setYcoord(int ycoord);
            int getYcoord();
            //Name
            void setName(string name);
            string getName();
            //Direction
            void setDirection(string direction);
            string getDirection();
            //Speed
            void setSpeed(int speed);
            int getSpeed();
            //Printout
            string getRoverData(Rover rover);
};
#endif  /* ROVER_H */

我目前收到的错误是：

rover.cpp:64: error: no match for 'operator<<' in '"Data for " << Rover::getName()()'

这到底是什么意思？

在这一点上，我希望打印输出说的是：

Data for Default
X: 0
Y: 0
Direction: N
Speed: 0

有什么想法吗？

抱歉，如果代码在我发布时看起来很糟糕......以前没有这样做过。

更新：

#include <iostream>
#include "Rover.h"
using namespace std;
//put functions in here
void Rover::setDefaultValues() {
    name = "Default";
    xcoord = 0;
    ycoord = 0;
    direction = "N";
    speed = 0;
}
void Rover::constructRover() {
}
void Rover::setXcoord(int xcoord) {
    this->xcoord = xcoord;
}
void Rover::setYcoord(int ycoord) {
    this->ycoord = ycoord;
}
void Rover::setName(string name) {
    this->name = name;
}
void Rover::setDirection(string direction) {
    this->direction = direction;
}
void Rover::setSpeed(int speed) {
    this->speed = speed;
}
int Rover::getXcoord() {
    return xcoord;
}
int Rover::getYcoord() {
    return ycoord;
}
string Rover::getName() {
    return name;
}
string Rover::getDirection() {
    return direction;
}
int Rover::getSpeed() {
    return speed;
}
string Rover::getRoverData(Rover rover) {
    string printStatement = "";
    printStatement.append("Data for " + rover.getName());
    printStatement.append("nX: " + rover.getXcoord());
    printStatement.append("nY: " + rover.getYcoord());
    printStatement.append("nDirection: " + rover.getDirection());
    printStatement.append("nSpeed: " + rover.getSpeed());
    return printStatement;
}

所以，现在打印输出是：

Data for Default
X:
Y:
Direction: N
Speed:

所以，它基本上不会打印出零。思潮？