ppt

1. MEMORY MANAGEMENT IN C++
Presented by:- Chetan Raut.
Presented To:- Ms. Shalinee Pareek.

2. What’s in it for you ?
What is memory management ?
Why we need memory management ?
Memory allocation and deallocation in c++
C++ new operator
C++ delete operator

3. What is memory management ?
Memory management can be defined as the process to
manage a computer’s memory.
Example: Assigning memory to programs. Variables etc.
So, that it doesn’t affect the overall
performance.

4. Why we need memory management?
Memory management is required to avoid wastages of
memory and to make sure allocation takes place
efficiently.
During the declaration of arrays, sometimes the exact
memory is not known to us, and that is why we declare an
array of max size. Which results in memory wastages.
To avoid such case, we use memory allocation.

5. Memory allocation and deallocation in C++
Programming languages like java, python, etc. have the
compiler that manages the memory allocation.
In the case of C++, the allocation and deallocation of
memory are done manually.
In C++, there are two operators that is used for the
allocation and deallocation of memory.
1) New operator.
2) Delete operator.

6. C++ New Operator
The new operator in C++ is used for dynamic memory
allocation.
The new operator is responsible for the creation of the object.
Syntax:-
Pointer variable= new datatype;
Syntax for arrays:-
Pointer Variable = new datatype[size];
In case of arrays, the new keyword returns
the address of first element
Example
int *ptr;
ptr = new int;
*ptr= 75;
Keyword Data Type of pointer

7. C++ Delete Operator
The Delete operator in C++ is used for deallocation of memory or
for releasing of memory space.
Once the memory is no longer required, then we have to
deallocation the memory using the delete operator.
Syntax:-
delete Pointer variable;
Syntax for arrays:-
delete[]Pointer Variable;
Example
int *ptr;
ptr = new int;
*ptr= 75;
//After printing
delete ptr;

8. #include<iostream>
Using namespace std;
Int main(){
int *ptr1;
int *ptr2;
int *ptr3;
int avg;
ptr1= new int;
ptr2= new int;
ptr3=new int;
cout<<“Enter the first number: ”;
cin>>*ptr1;
cout<<“Enter the second number: ”;
cin>>*ptr2;
cout<<“Enter the third number: ”;
cin>>*ptr3;
}
avg=(*ptr1+*ptr2+*ptr3)/3;
cout<<“Average is : ”<<avg<<endl;
delete ptr1;
delete ptr2;
delete ptr3;
}
Output:-
Enter the first number: 5
Enter the second number: 5
Enter the third number: 2
Average is : 4

9. #include<iostream>
Using namespace std;
Int main(){
int size;
cout<<“Enter the size: ”;
cin>>size;
int *ptr;
ptr= new int[size];
cout<<“Enter the element: ”<<endl;
for(int i=0;i<size;i++)
{
cout<<“Element: ”;
cin>>ptr[i];
}
{ cout<<“nElements that you have entered : ”<<endl;
for(int i=0;i<size;i++)
{
cout<<“Element : ”<<ptr[i]<<endl;
}
delete ptr;
}
Output:-
Enter the size: 4
Enter the element:
Element: 2
Element: 4
Element: 7
Element: 9
Elements that you have entered :
Element: 2
Element: 4
Element: 7
Element: 9

10. THANK YOU