面向对象编程代做 Advanced Data Structures代写

COEN 79 Object-Oriented Programming and Advanced Data Structures

Assignment #3 2 points per question, unless noted

面向对象编程代做 1.The sequence’s insert member function normally puts a new item before the current item. What does insert do if there is no current item?

1.

The sequence’s insert member function normally puts a new item before the current item. What does insert do if there is no current item?

 

 

2.(4 pts)  面向对象编程代做

Modify the following code to generate the given output. Do not modify the main function.

1. #include < iostream >
2. using namespace std;
3.
4. class box {
5.
6. public:
7.   // Constructor definition
8.   box(double l = 2.0, double b = 2.0, double h = 2.0) {
9.       length = l;
10.      breadth = b;
11.      1height = h;
12.      }
13.
14.   double volume() {
15.     return length * breadth * height; }
16.
17. private:
18.   double length;
19.   double breadth;
20.   double height;
21. };
22.
23. int main(void) {
24.   box Box1(3.3, 1.2, 1.5); // Declare box1
25.
26.   box Box2(8.5, 6.0, 2.0); // Declare box2
27.
28.   return 0;
29. }  

Output:

Number of box objects created so far: 1
Number of box objects created so far: 2

 

3.(6 pts)  面向对象编程代做

In the following code, indicate if the selected lines are legal or illegal:

#include <iostream>

class small
{
public:
  small( ) {size = 0;};
  void k() const;
  void h(int i);
  friend void f(small z);

private:
  int size;
};

void small::k() const
{
  small x, y;
  x = y; // LEGAL/ILLEGAL?
  x.size = y.size; // LEGAL/ILLEGAL?
  size = 3; // LEGAL/ILLEGAL?
};

void small::h(int i)
{

};

void f(small z)
{
  small x, y;
  x = y; // LEGAL/ILLEGAL?
  x.size = y.size; // LEGAL/ILLEGAL?
  x.size = 3; // LEGAL/ILLEGAL?
  x.h(42); // LEGAL/ILLEGAL?
};

int main() {
  small x, y;
  x = y; // LEGAL/ILLEGAL?
  x.size = y.size; // LEGAL/ILLEGAL?
  x.size = 3; // LEGAL/ILLEGAL?
  x.h(42); // LEGAL/ILLEGAL?

  return 0;
}

 

 

 

4.(4 pts)  面向对象编程代做

We create an array of fruit in the main function. How can we make sure that for all the items in array fruit_ptr the values of weight and color are equal to 1 and 2, respectively? Please show your solution. Do not modify the main function.

1. class fruit {
2. private:
3.   int weight;
4.   int color;
5. }
6.
7. main() {
8.   fruit * fruit_ptr;
9.   fruit_ptr = new fruit[100];
10. }

 

 

5.

Explain why heap variables are essentially global in scope. Please present an example as well.

 

 

6.

Is it possible to use the keyword “this” inside a friend function? Please explain your answer.

 

7.(4 pts)  面向对象编程代做

Does the following code compile? Does it run? Is there any problem with the code? If yes, how do you fix it?

1. #include < iostream >
2. using namespace std;
3.
4. class Computer {
5.    int Id;
6.
7. public:
8.    Computer(int id) { this -> Id = id; }
9.    void process() { cout << "Computer::process()"; }
10. };
11.
12. class Employee {
13.   Computer* c;
14.
15. public:
16.   Employee() { c = new Computer(123); }
17.   ~Employee() {}
18.   void foo() {
19.   cout << "Employee::foo()";
20.   c -> process();
21.  }
22. };
23.
24. int main() {
25.   Employee ob;
26.   ob.foo();
27.   return 0;
28. }

 

 

 

 

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