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尝试使用数组列表实现选择排序。但是,我似乎无法从 main 调用我的任何列表函数。

执行此代码时,我收到以下错误:

arraylist.cpp: In function ‘int main()’:
arraylist.cpp:92:49: error: no matching function for call to ‘List::retrieve(int, const char [4], bool&)’
arraylist.cpp:47:6: note: candidate is: void List::retrieve(int, ListItemType&, bool&) const

我不太确定如何定义 ListItemType 函数。

我班上的其他人使用的功能与我在他们的主要功能中使用的功能相同,但他们的方法似乎没有问题。

一点帮助会很好。

标题:

/** @file ListA.h */
#include <string>
using namespace std;
const int MAX_LIST = 10;
typedef string ListItemType;
class List
{

public:
   List();
   bool isEmpty() const;
   int getLength() const;
   void insert(int index, const ListItemType& newItem, bool& success);
   void retrieve(int index, ListItemType& dataItem, bool & success) const;
   void remove(int index, bool& success);
private:
    ListItemType items[10];
    int size;
    int translate(int index) const;
};

执行:

    /** @file ListA.cpp */

#include "ArrayList.h"  // header file
#include <iostream>
#include <fstream>

List::List() : size(0)
{
}
bool List::isEmpty() const
{
   return size == 0;
}
int List::getLength() const
{
   return size;
}
void List::insert(int index, const ListItemType& newItem,
bool& success)
{
success = (index >= 1) &&
(index <= size + 1) &&
(size < MAX_LIST);
   if (success)
   {
      for (int pos = size; pos >= index; --pos)
         items[translate(pos + 1)] = items[translate(pos)];
      items[translate(index)] = newItem;
      ++size;  // increase the size of the list by one
   }  
}  

void List::remove(int index, bool& success)
{
   success = (index >= 1) && (index <= size);
   if (success)
   {
      for (int fromPosition = index + 1;
       fromPosition <= size;
       ++fromPosition)
         items[translate(fromPosition - 1)] = items[translate(fromPosition)];
      --size;  // decrease the size of the list by one
   }  // end if

}  // end remove

void List::retrieve(int index, ListItemType& dataItem,
bool& success) const
{
   success = (index >= 1) && (index <= size);
   if (success)
      dataItem = items[translate(index)];
}

int List::translate(int index) const
{
   return index - 1;
}
 int main()
 {
 int var1 = 1;
 int numberofitems;
 int n = 0;
 int p = 0;
 cout << "Please enter the number of data items:" << endl;
 cin >> numberofitems;
 cout << endl;
 cout << "Please enter the data items, one per line:" << endl;
 int listofitems[10];
 //string mainlistitemptype = "int";
 List myArrayList;
 cout << myArrayList.getLength() << endl;
        if (myArrayList.isEmpty())  // tests before
    {
        cout << "This list is empty \n" << endl;
    }
    else
    {
        cout << "List is not empty! \n"<< endl;
    }
 //myArrayList.size(numberofitems);
 bool mainsucc = false;
 int mainarraylistsize = myArrayList.getLength();
 for (int i = 0; i<numberofitems; i++)
 {
 cout << "Enter number " << i + 1 << " : " ;
 cin >> listofitems[i];
 myArrayList.insert(listofitems[i], "int", mainsucc);
 }
 for (int i=0; i<mainarraylistsize; i++)
 {
 cout << myArrayList.retrieve(0, "int", mainsucc);
 }
 return 1;
 }
4

1 回答 1

1

有几个错误:

int listofitems[numberofitems];

numberofitems需要是一个常量,我猜因为ListItemTypestring应该listofitems是一个 s 数组string。这是一个功能:

List myArrayList();

您打算实例化 a List,因此它应该是:

List myArrayList ;

这个:

int mainarraylistsize = (myArrayList.getLength);

应该:

 int mainarraylistsize = myArrayList.getLength() ;

并且这个参数列表不正确:

 myArrayList.insert(listofitems[i], 1, mainsucc);

参数二应该是一个ListItemType类型,但你传入的是一个int,这可能是你想要的:

 myArrayList.insert(i, listofitems[i], mainsucc);
于 2013-03-13T00:47:38.773 回答