c++ - 错误 LNK 2019 未解析的外部符号类 std::basic_istream

Question

我正在尝试重载输出和输入流运算符，但在编译时出现此错误

错误 1 ​​错误 LNK2019：未解析的外部符号“class std::basic_istream > & __cdecl operator>>(class std::basic_istream

&,class Complex const &)" (??5@YAAAV?$basic_istream@DU?$char_traits@D@std@@@std@@AAV01@ABVComplex@@@Z) 在函数 _main C:\Users\owner 中引用\Documents\Personal\practice\main.obj 练习

基本上我正在尝试读取用户输入并将其解析为实数和虚数

复杂的.h

#pragma once
#include <iostream>
using namespace std;

class Complex
{
public:
    Complex(void);
    ~Complex(void);
    friend ostream& operator<<(ostream&, const Complex &C);
    friend istream& operator>>(istream&, const Complex &C);
    int real;
    int imaginary;
};

复杂的.cpp

#include "Complex.h"

using namespace std;

Complex::Complex()
{
    real = 0;
    imaginary = 0;
}


Complex::~Complex(void)
{
}

ostream &operator<<(ostream &output, const Complex &C)
{
    char symbol = '+';
    if (C.imaginary < 0)
        symbol = '-';
    output << C.real << ' ' << symbol << ' ' << abs(C.imaginary) << 'i';
    return output;
}

istream &operator>>(istream &input, Complex &C)
{
    int tempReal;
    char symbol;
    char tempImaginaryFull[2];
    int tempImaginary;
    input >> tempReal >> symbol >> tempImaginaryFull;
    C.real = tempReal;
    tempImaginary = tempImaginaryFull[0];
    C.imaginary = tempImaginary;
    if( symbol == '-')
        C.imaginary *= -1;

    return input;
}

我真的不知道这个错误是什么意思，即使我已经试着四处寻找它。