C++ C++;链接器错误iostream重载

C++ C++;链接器错误iostream重载,c++,overloading,iostream,linker-errors,C++,Overloading,Iostream,Linker Errors,我试图编译包含这两个文件的程序时,出现两个链接器错误(导致问题,尤其是粗体的行) 我是C++新手,请原谅我的无知。< /P> Assignment1.obj:错误LNK2001:未解析的外部符号“public:class Vector\uu thiscall Vector::operator^(class Vector)”(??TVector@@QAE?AV0@V0@@Z) 1> Assignment1.obj:错误LNK2001:未解析的外部符号“class std::basic_ostrea

我试图编译包含这两个文件的程序时,出现两个链接器错误(导致问题,尤其是粗体的行)

我是C++新手,请原谅我的无知。< /P> Assignment1.obj:错误LNK2001:未解析的外部符号“public:class Vector\uu thiscall Vector::operator^(class Vector)”(??TVector@@QAE?AV0@V0@@Z)


1> Assignment1.obj:错误LNK2001:未解析的外部符号“class std::basic_ostream>和u cdecl操作符很难从给出的信息中看出问题所在;你在C++代码> C < /C>文件中有C++代码,但是如果你没有编译器来识别它,你的编译器会抱怨。为避免产生疑问,请重命名
point.c
文件
point.cpp

一般来说,使用你想成为朋友的东西的转发声明是个好主意;这可以确保您与一些顶级函数而不是一些内部函数(特别是友元类)成为朋友

//转发声明
类点;
std::istream&operator>>(std::istream&Point&);
std::ostream&operator>(std::istream&Point&);
friend std::ostream&operator
#包含
没有

向量类中有一个错误,没有定义“^”运算符。此外,出于优先考虑,最好不要在操作中使用^。除此之外,它真的不明显是什么


关于你的ostream问题,我不完全确定…

第一个错误是抱怨缺少你作为朋友使用的
向量
类定义,而不是
向量
,它包含在你的
.cpp
中,而不是资本化。你打算使用不同的课程吗

#ifndef SS_Point_H
#define SS_Point_H

#include "common.h"

//==================================================================
//  Point Class Definition
//==================================================================

class Point {
friend class Vector;
protected:
 int dimn;            // # coords (1, 2, or 3 max here)
 Error err;           // error indicator
public:
 double x, y, z;      // z=0 for 2D, y=z=0 for 1D

 //----------------------------------------------------------
 // Lots of Constructors (add more as needed)
 Point() { dimn=3; x=y=z=0; err=Enot; }
 // 1D Point
 Point( int a) {
  dimn=1; x=a; y=z=0; err=Enot; }
 Point( double a) {
  dimn=1; x=a; y=z=0; err=Enot; }
 // 2D Point
 Point( int a, int b) {
  dimn=2; x=a; y=b; z=0; err=Enot; }
 Point( double a, double b) {
  dimn=2; x=a; y=b; z=0; err=Enot; }
 // 3D Point
 Point( int a, int b, int c) {
  dimn=3; x=a; y=b; z=c; err=Enot; }
 Point( double a, double b, double c) {
  dimn=3; x=a; y=b; z=c; err=Enot; }
 // n-dim Point
 Point( int n, int a[]);
 Point( int n, double a[]);
 // Destructor
 ~Point() {};

 //----------------------------------------------------------
 // Input/Output streams
 **friend std::istream& operator>> ( std::istream&, Point&);
 friend std::ostream& operator<< ( std::ostream&, Point );**
#include "point.h"
#include "vector.h"
#include <iostream.h>
//==================================================================
// Point Class Methods
//==================================================================

//------------------------------------------------------------------
// Constructors (add more as needed)
//------------------------------------------------------------------

// n-dim Point
Point::Point( int n, int a[]) {
 x = y = z = 0;
 err = Enot;
 switch (dimn = n) {
 case 3: z = a[2];
 case 2: y = a[1];
 case 1: x = a[0];
  break;
 default:
  err=Edim;
 }
}

Point::Point( int n, double a[]) {
 x = y = z = 0.0;
 err = Enot;
 switch (dimn = n) {
 case 3: z = a[2];
 case 2: y = a[1];
 case 1: x = a[0];
  break;
 default:
  err=Edim;
 }
}

//------------------------------------------------------------------
// IO streams
//------------------------------------------------------------------

// Read input Point format: "(%f)", "(%f, %f)", or "(%f, %f, %f)"


**std::istream& operator>>( std::istream& input, Point& P) {**
     char c;
     input >> c;                // skip '('
     input >> P.x;
     input >> c;                
     if (c == ')') {
      P.setdim(1);       // 1D coord
      return input;
     }
     // else                    // skip ','
     input >> P.y;
     input >> c;
     if (c == ')') {
      P.setdim(2);       // 2D coord
      return input;
     }
     // else                    // skip ','
     input >> P.z;
     P.setdim(3);               // 3D coord
     input >> c;                // skip ')'
     return input;
    }

// Write output Point in format: "(%f)", "(%f, %f)", or "(%f, %f, %f)"
**std::ostream& operator<<( std::ostream& output, Point P) {**
 switch (P.dim()) {
 case 1:
  output << "(" << P.x << ")";
  break;
 case 2:
  output << "(" << P.x << ", " << P.y << ")";
  break;
 case 3:
  output << "(" << P.x << ", " << P.y << ", " << P.z << ")";
  break;
 default:
  output << "Error: P.dim = " << P.dim();
 }
 return output;
}
// forward declarations
class Point;
std::istream& operator>> ( std::istream&, Point&);
std::ostream& operator<< ( std::ostream&, Point );

// point class
class Point {
   ...
   friend std::istream& operator>> ( std::istream&, Point&);
   friend std::ostream& operator<< ( std::ostream&, Point );
   ...
#include <iostream>