A. Complete the following program which display the length of a line: #include <

Question

A. Complete the following program which display the length of a line:

#include <iostream>

using namespace std;

class Line

{

public:

int getLength( void );

Line( int len ); // simple constructor

Line( const Line &obj); // copy constructor

~Line(); // destructor

private:

int *ptr; // pointer

};

// Member functions definitions including constructor

Line::Line(int len)

{

cout << "Normal constructor allocating ptr" << endl;

------------------------// allocate memory for the pointer;

------------------------// complete with necessary statement ;

}

Line::Line(const Line &obj)

{

cout << "Copy constructor allocating ptr." << endl;

----------------------- // allocate memory for the pointer;

----------------------- // copy the value }

Line::~Line(void)

{

cout << "Freeing memory!" << endl;

-----------------------// complete with necessary statement ;}

int Line::getLength( void )

{

------------------// complete with necessary statement ;}

void display(Line obj)

{

cout << "Length of line : " << --------------------- <<endl; // complete

with necessary statement ;

}

// Main function for the program

int main( )

{

Line line(10);

display(line);

return 0;}

Explanation / Answer

// A. Complete the following program which display the length of a line:
#include <iostream>
using namespace std;
class Line
{
public:
int getLength( void );
Line( int len ); // simple constructor
Line( const Line &obj); // copy constructor
~Line(); // destructor
private:
int *ptr; // pointer
int size; // size of line.
};
// Member functions definitions including constructor
Line::Line(int len)
{
cout << "Normal constructor allocating ptr" << endl;
ptr = new int[len];// allocate memory for the pointer;
size = len;// complete with necessary statement ;
}
Line::Line(const Line &obj)
{
cout << "Copy constructor allocating ptr." << endl;
ptr = new int[obj.size]; // allocate memory for the pointer;
size = obj.size; // copy the value
}
Line::~Line(void)
{
cout << "Freeing memory!" << endl;
delete[] ptr;// complete with necessary statement ;
}
int Line::getLength( void )
{
return size;// complete with necessary statement ;
}
void display(Line obj)
{
cout << "Length of line : " <<obj.getLength() <<endl; // complete with necessary statement ;
}
// Main function for the program
int main( )
{
Line line(10);
display(line);
return 0;
}

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