Question

我正在制作有序数组。元素是有序的。例1,2,3,4,5,6,77,89,100,201。我要求用户输入数组的大小。这很好，推送功能将元素排序。但是当调整arrayList的大小时，不再以有序的方式分配元素。

这是我的代码：

//-------------------------------------------------------
//  Name:           Array::Resize
//  Description:    Resize the array to a new size.
//  Arguments:      p_size.  The new size of the Array.
//-------------------------------------------------------
    void Resize(int p_size)//resizes the array to the size of p_size
    {
        cout << "Did i get this far ";
        if(p_size < 0)//checks if new size is less than 0
        {
            cout << "ERROR! Size of an array can not be less than 0!" << endl;
        }
        else//else its ok to continue
        {
            Datatype* newArray = new Datatype[p_size];//creates a pointer newArray that points at a new array
            if(newArray == 0)
            {
                return;
            }
            cout << "Did i get this far ";
            int min;

            if(p_size < size)//checks the if the new array is smaller than the old one
                min = p_size;
            else//else its going to be bigger
                min = size;
            cout << "Did i get this far ";
            int index;
            int temp = num_elements;//puts num_elements into a temporary variable called temp
            num_elements = 0;//num_elements is set to 0
            for(index = 0; index < min; index++)
            {
                newArray[index] = m_array[index];//places everything from the old array into the new array that will fit.
                if(num_elements < temp)//if the num_elements is less than temp(the original num_elements)
                {
                    num_elements++;//increment num_elements. This will keep incrementing to create the new num_elements based the number of elements cut off in the resize
                }
            }
            size = p_size;//sets the old size to be equal to the new size
            cout << "Did i get this far ";
            if(m_array != 0)
            cout << "\nI am just about to delete ";
            //delete[] m_array;//deletes the old array
            m_array = newArray;//makes m_array point at the new array
            newArray = 0;//makes newArray a null pointer
        }
    }

//---------------------------------------------------------------------------------------
// Name:             Push
// Description:      
//---------------------------------------------------------------------------------------
void push(Datatype p_item)
{
    if(num_elements == size)//checks if the array is full and needs to be resized
    {
        Resize(size + g_size);//calls the resize function
    }

    int pos = num_elements;
    for(int x=0;x<num_elements;x++)
    {
        if(p_item < m_array[x])
        {
        pos=x;
        }
    }

    //loops through the array from high to low moving all values to the right
    //to make space for the passed in value until it gets to the right place
    for(int index = num_elements; index >= pos; index--)
    {
        m_array[index] = m_array[index-1];//moves the values to the right
    }
        m_array[pos] = p_item;//the passed in value is positioned into its ordered position
        num_elements++;

    cout<< "Num Elements " << num_elements;
    cout<< "Size " <<size;
}

//--------------------------------------------------------------------------------------------
//  Name:           template <class Datatype>   
//  Description:        

    //--------------------------------

template <class Datatype>
//--------------------------------------------------------------------------------------------
//  Class: OrderedArray.            
//--------------------------------------------------------------------------------------------
class OrderedArray
{
//--------------------------------------------------------------------------------------------
//  Member Variables.           
//--------------------------------------------------------------------------------------------
private:
Datatype* m_array;
int size;
int g_size;
int num_elements;   //Counter for the number of elements in the Array.
//--------------------------------------------------------------------------------------------
//  Name:           Constructor.
//  Description:    Constructs the Array.
//--------------------------------------------------------------------------------------------
OrderedArray(int p_size)
{
    //Sets the Array size.
    m_array = new Datatype[p_size]; 
    size = p_size;
    grow_size = 1;  
    //How many elements are in the Array.
    num_elements = 0;               
}

非常感谢任何帮助。

Answer 1

我建议使用m的最后一个元素的副本作为新元素而不是默认构造的实例。因此，最后一个元素将更大或等于数组的所有前面元素。

有序数组。调整大小不允许有序元素

1 个答案: