Question

我已经在这方面工作了一段时间，我似乎无法弄明白。我无法编译代码，因为它不断抛出以下错误。基本上我想要做的是使用指针创建一个包含基类和派生类的对象的向量。

最终Assignment.obj：错误LNK2019：未解析的外部符号“public：__thiscall Product :: Product（void）”（?? 0Product @@ QAE @ XZ）在函数“public：__thiscall SaleProduct :: SaleProduct（char， class std :: basic_string，class std :: allocator＆gt;，int，double，double）“（?? 0SaleProduct @@ QAE @ DV？$ basic_string @ DU？$ char_traits @ D @ std @@ V？$ allocator @ D @ @@ 2 STD @@ @ HNN Z）
致命错误LNK1120：1个未解析的外部

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <iomanip>
#include <vector>
#include <string>
using namespace std;

class Product
{


public:

Product();
Product(char iT,string des,int inv,double p,double dis)
{
invType = iT;
description = des;
inventory = inv;
price = p;
discount = dis;
}

char getInvType(){
return invType;
}

protected:
char invType ;
string description;
int inventory;
double price;
double discount;
};

class SaleProduct:public Product {

public:



//SaleProduct();
SaleProduct(char iT,string des,int inv,double p,double dis){


}


};



int main()
{
int choice = 0;
// SaleProduct* SaleProductOB;
// Product *productPoint = &ProductOB;
 vector<Product*> inventoryVec;

  char invType;
  string description;
  int inventory;
  double price;
  double discount = 0;




ifstream inFile("Inventory.txt");

if (inFile.is_open()){

while (inFile >> invType >> description >> inventory >> price >>discount){

      if (invType == 'S'){

           inventoryVec.push_back(new SaleProduct(invType,description,inventory,price,discount)  );
     }else{
    //inventoryVec.push_back(new Product(invType,description,inventory,price,discount)  );

      }

}
}else{
cout << "File is not ready!";
}



cout << inventoryVec.size() << endl;


while (choice != 3) {
        cout << "Please enter your choice:" << endl;
        cout << "1. Print available items"  << endl;
        cout << "2. Add item to cart"       << endl;
        cout << "3. Print receipt and quit" << endl << endl;

        cin >> choice;
 }








//system("PAUSE");
return 0;
}

Answer 1

您可能需要指定正确的构造函数（因为它正在尝试使用默认构造函数，它没有实际的定义）：

SaleProduct(char iT,string des,int inv,double p,double dis) : 
   Product(iT, des, inv, p, dis ){

VS2010致命错误LNK1120：1个未解决的外部因素

1 个答案: