Lab 7
CS120
CS120
Programming 2
1
• Equivalent functionally.
CS120
Function with constant
parameters
• In the second definition, You can’t modify the
parameter a .
2
CS120
Dynamic Memory
Management
3
Dynamic Memory Management
• There may be cases where the memory needs of
a program can only be determined during
runtime.
• On these case, programs need to dynamically
allocate memory, for which the C++ language
integrates the operators new and delete.
CS120
• Defining the variables before program execution
determined memory needs.
4
Dynamic Memory Management
(creating object at run-time)
#include <iostream>
int main()
{
int number = 1;
switch(number){
case 1:
{
a a1;
using namespace std;
cout<<"obj created "<<a1.num<<endl;
break;
}
case 2:
{
cout<<"nothing";
break;}
}
return 0;
class a{
public:
int num;
a()
{num=1;}
};
}
CS120
• EX:
5
Array of objects
• The "identifier" used to refer the array of objects
is an user defined data type.
CS120
• Arrays of variables of type "class" is known as
"Array of objects".
6
CS120
Example
7
8
CS120
Write C++ program that define the following classes:
Employee
- ID: int
- name: string
+ Employee ()
+ setID(in id:int)
+ setName(in n:string)
+ getID()
+ getName()
In the main function:
 Define 3 Employee objects.
 Define EmployeeArray which is has the 3 objects.
 Let the user determine the id and name .
 Print all 3 employee's information.
CS120
•
9