Question

对C ++来说很新，我一直在关注3DBuzz.com的中级教程，并试图尝试他们的任务。

目前的教程是关于课程的：http://www.3dbuzz.com/vbforum/sv_showvideo.php?v=37

我正在尝试重载＆amp;运算符＆lt;＆lt;在我想要的时候输出我的'Point'作为流。视频的相关部分从 39:00 开始。

据我所知，我的代码在语法上是相同的（虽然我是新的，所以我可能错过了一些东西）但是我得到了错误：

1＆gt; c：\ users \ jack \ documents \ visual studio 2010 \ projects \ myfirstgame \ myfirstgame \ main.cpp（88）：错误C2146：语法错误：缺少';'在标识符“myPoint

之前

我意识到我在运算符重载函数中声明了实例Point＆amp; myPoint ..但我不知道我能在哪里做到这一点所以编译器知道它是什么......如果这是有道理的。

任何帮助表示赞赏！感谢

#include <iostream>
#include <cmath>

using namespace std;

class Point
{
public:
Point(float f_x = 0.0, float f_y = 0.0, float f_z = 0.0);

~Point();

void SetXYZ(float X, float Y, float Z);
void SetX(float X);
void SetY(float Y);
void SetZ(float Z);

void GetXYZ(float &X, float &Y, float &Z);
float GetX();
float GetY();
float GetZ();
private:

float x, y, z;

protected:

};

Point::Point(float f_x, float f_y, float f_z)
{
cout << "Constructor with ARGUMENTS!" << endl;

x = f_x;
y = f_y;
z = f_z;
}

void Point::GetXYZ(float &X, float &Y, float &Z)
{
X = GetX();
Y = GetY();
Z = GetZ();
}
float Point::GetX()
{
return x;
}

float Point::GetY()
 {
return y;
 }

float Point::GetZ()
{
return z;
}

void Point::SetXYZ(float X,float Y, float Z)
{
SetX(X);
SetY(Y);
SetZ(Z);
}
void Point::SetX(float X)
{
x = X;
}

void Point::SetY(float Y)
{
y = Y;
}

void Point::SetZ(float Z)
{
z = Z;
}

Point::~Point()
{
cout << "We're in the destructor" << endl;
}

 ostream &operator <<(ostream &stream, Point &myPoint)
{
stream << myPoint.GetX() << " " << myPoint.GetY() << " " myPoint.GetZ();
return stream;
}

void main()
{
float x, y, z; //Declaring floats for use in GetXYZ()

Point myLocation (1,2,-1); //Creating instance and using Point(...) function
cout << myLocation.GetX() << myLocation.GetY() << myLocation.GetZ() <<endl; // Getting xyz values and printing

myLocation.SetXYZ(2,3,-4); //Testing SetXYZ function
cout << myLocation.GetX() << myLocation.GetY() << myLocation.GetZ() <<endl; // Getting xyz values and printing


myLocation.GetXYZ(x, y, z);
cout << x << " " << y << " " << z << endl;

cout << myLocation;


    system("PAUSE");
}

编辑：令人难以置信的回应！喜欢这个网站。谢谢大家发现这个^^

Answer 1

您遗失了<<：

stream << myPoint.GetX() << " " << myPoint.GetY() << " " myPoint.GetZ();
                                                       ^^

Answer 2

在第88行，您应该添加＆lt;＆lt;在myPoint.GetZ();之前

您的代码：

stream << myPoint.GetX() << " " << myPoint.GetY() << " " myPoint.GetZ();

校正：

stream << myPoint.GetX() << " " << myPoint.GetY() << " " << myPoint.GetZ();

Answer 3

看到这两者之间的差异？

stream << myPoint.GetX() << " " << myPoint.GetY() << " " myPoint.GetZ();
stream << myPoint.GetX() << " " << myPoint.GetY() << " " << myPoint.GetZ();

Answer 4

以下是问题：stream << myPoint.GetX() << " " << myPoint.GetY() << " " myPoint.GetZ();您在最后<<和最后" "之间缺少myPoint。

Answer 5

你走了：

ostream &operator <<(ostream &stream, Point &myPoint) { stream << myPoint.GetX() << " " << myPoint.GetY() << " "<< myPoint.GetZ(); return stream; }

请注意额外的“＆lt;＆lt;”在myPoint.GetZ（）;

之前

C ++：我无法发现的简单错误！ C2146

5 个答案: