我很难在我的数组列表中实现一些函数。
我想使用预定义的函数“插入”将一个值插入到列表中。然后我想使用检索函数打印出整个列表的值。
但是，当我测试我的函数时，程序在插入最后一个值后以分段核心转储退出
任何帮助，将不胜感激。
标题：
/** @file ListA.h */
#include <string>
using namespace std;
const int MAX_LIST = 0;
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);
List selectionSort(List selectList);
private:
ListItemType items[];
int size;
int translate(int index) const;
};
执行：
/** @file ListA.cpp */
#include "ArrayList.h" // header file
#include <iostream>
#include <fstream>
List::List() : size()
{
}
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;
}
}
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;
}
List List::selectionSort(List selectList)
{
return selectList;
}
int main()
{
ListItemType insertType = "listItem1";
ListItemType retrieveType = "listitem2";
int numberofitems;
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[numberofitems];
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;
}
bool mainsucc = true;
for (int i = 0; i<numberofitems; i++)
{
cout << "Enter number " << i + 1 << " : " << endl;
cin >> listofitems[i];
}
for (int i =0; i <numberofitems; i++){
myArrayList.insert(listofitems[i], insertType, mainsucc);}
cout << "Size of the list is : " << myArrayList.getLength() << endl;
/*for (int i=0; i<mainarraylistsize; i++)
{
cout << myArrayList.retrieve(listofitems[i], retrieveType, mainsucc);
}*/
if (myArrayList.isEmpty()) // tests after
{
cout << "This list is empty \n" << endl;
}
else
{
cout << "List is not empty! \n"<< endl;
}
return 1;
}