Sample Output Program to dynamically Allocates an array of integers. Enter the s

Question

Sample Output

Program to dynamically Allocates an array of integers.

Enter the size of the array: 4

Enter a value: 1

Enter a value: 2

Enter a value: 3

Enter a value: 4

The elements of the array are:

1 2 3 4

Enter the elements in the array after reallocation:

Enter a value: 5

Enter a value: 6

Enter a value: 7

Enter a value: 8       

1 2 3 4 5 6 78          

Sample Output

Program to dynamically Allocates an array of integers.

Enter the size of the array: 4

Enter a value: 1

Enter a value: 2

Enter a value: 3

Enter a value: 4

The elements of the array are:

1 2 3 4

Enter the elements in the array after reallocation:

Enter a value: 5

Enter a value: 6

Enter a value: 7

Enter a value: 8       

1 2 3 4 5 6 78          

Explanation / Answer

class A { size_t mSize; int& mArray; public:   // Simpleconstructor/destructor are obvious.   A()    {mSize=0;mArray = NULL;}   A(size_t s) {mSize=s;mArray = new int[mSize];}    ~A()    {delete [] mArray;}   // Copyconstructor needs more work   A(A const&copy)   {    // Alwayscreate the copy first.    // Only setthe member variables after the copy hassucceeded    // NB NEVER delete your data before the copyworked.    int* data =new int[copy.mSize];    // Don'tneed to worry about copying integers.    // But ifthe object has a copy constructor then    // it wouldalso need to worry about throws from the copyconstructor.    std::copy(&copy.mArray[0],&copy.mArray[c.mSize],data);    delete []mArray;    mArray =data;    mSize = copy.mSize;   }   // Defineassignment operator in terms of the copyconstructor   A& operator=(Aconst& copy)   {    if (this ==&copy)    {    // Ignore assignment to self.    return;    }    // Use thestandard copy and swap idiom    A tmp(copy);    tmp.swap(*this);   }   void swap(A&s) throws ()   {    std::swap(this.mArray,s.mArray);    std::swap(this.mSize ,s.mSize);   } }

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