Simple new Memory Allocation Operator Example Program In C++

Read About C++ Operators

Definition

• In C++, new Operator is used to allocating memory at runtime.
• The new operator demands memory allocation at runtime If enough memory is possible in the system. The new operator returns the address for newly allocated memory into the variable or object.

Syntax

data_type *ptr;
ptr = new data_type[size];

for example,
int *ptr;
ptr = new data_type[10];

new Operator for Memory Allocation Example Program

// Header Files
#include<iostream>
#include<conio.h>
#include<stdio.h>

//Main Function

using namespace std;

int a = 100; //Global variable

int main() {
   // Local Variable Declaration
   int num, *ptr, i;

   cout << "Simple new Memory Allocation Example Program In C++\n";

   cout << "Enter the Number for Dynamic Array : ";
   cin >> num;

   // Dynamic Array Created
   ptr = new int[num];

   cout << "Dynamic Array Created :" << num;
   cout << "\nEnter Values for Dynamic Array :\n";
   for (i = 0; i < num; i++)
      cin >> ptr[i];


   cout << "\nDynamic Array Values are\n";
   for (i = 0; i < num; i++)
      cout << ptr[i] << endl;

   //Main Function return Statement
   return 0;
}

Sample Output

Simple new Memory Allocation Example Program In C++
Enter the Number for Dynamic Array : 4
Dynamic Array Created :4
Enter Values for Dynamic Array :
100
450
300
120

Dynamic Array Values are
100
450
300
120