c ++引用参数函数 [英] c++ reference parameters functions

问题描述

Im参考参数有问题。 getStockInfo 中的值应存储在参考参数中。我不知道如何做，使 displayStatus 接受那些作为参数。每当我把东西放到 getStockInfo 中时，它给我的错误重载函数getStockInfo多于一个onstance匹配参数列表。

Im having trouble with the reference parameters. The values in getStockInfo are supposed to be stored in reference parameters. I dont know how to do that so that displayStatus accepts those as arguments. Whenever i put something into getStockInfo in main it gives me the error More than one onstance of overloaded function "getStockInfo" matches the argument list.

#include <iostream>
#include <iomanip>
using namespace std;

void getStockInfo(int &, int&, double&);
void displayStatus(int &, double &);

int main()
{
   int spoolsOrdered;
   int spoolsStock;
   double specialCharges;

   cout << "Middletown Wholesale Copper Wire Company" << endl;

   getStockInfo(spoolsOrdered, spoolsStock, specialCharges);
}

void getStockInfo(int &spoolsOrdered, int &spoolsStock, double specialCharges)
{
   char ship; 

   cout << "How many spools would you like to order: ";
   cin >> spoolsOrdered;

   //Validate the spools ordered 
   while(spoolsOrdered < 1)
   {
      cout << "Spools ordered must be at least one" << endl;
      cin >> spoolsOrdered;
   }

   cout << "How many spools are in stock: ";
   cin >> spoolsStock;

   //Validate spools in stock
   while(spoolsStock < 0)
   {
       cout << "Spools in stock must be at least 0" << endl;
       cin >> spoolsStock;
   }

   cout << "Are there any special shipping charges? ";
   cout << "Enter Y for yes or another letter for no: ";
   cin >> ship;

   //Validate special charges
   if(ship == 'Y' || ship == 'y')
   {
    cout << "Enter the special shipping charge: $";
    cin >> specialCharges;
   }
   else
   {
    specialCharges = 10.00;
   }
}

void displayStatus(int &backOrder, double &subtotal, double &shipping, double &total)
{
}  

推荐答案

您的声明和定义 getStockInfo differ：最后一个参数是一个引用，而另一个则不是。

Your declaration and definition of getStockInfo differ: The final parameter in one is a reference and in the other it is not.

void getStockInfo(int &, int&, double&);
...
void getStockInfo(int &spoolsOrdered, int &spoolsStock, double specialCharges)

displayStatus 会出现类似的问题：这里的参数数量不同。

A similar issue occurs with displayStatus: Here the number of parameters is different.

void displayStatus(int &, double &);
...
void displayStatus(int &backOrder, double &subtotal, double &shipping, double &total)

错误消息出现，因为编译器无法确定是否要告诉它调用 getStockInfo（int& int& double; / code>（可能来自另一个文件）或在此文件中定义的一个 void getStockInfo（int& int& double）。

The error message occurs since the compiler can't determine whether you are telling it to call getStockInfo(int &, int&, double&) (which may come from another file) or the one defined in this file void getStockInfo(int &, int&, double).

注意有多个版本不是错误。但是调用一个编译器不知道要调用哪个。

Note having multiple versions is not "wrong". However calling one in a way that the compiler doesn't know which one to call is.

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