C++ dynamic array

How to dynamically allocate an array c++

int* a = NULL;   // Pointer to int, initialize to nothing.
int n;           // Size needed for array
cin >> n;        // Read in the size
a = new int[n];  // Allocate n ints and save ptr in a.
for (int i=0; i<n; i++) {
    a[i] = 0;    // Initialize all elements to zero.
}
. . .  // Use a as a normal array
delete [] a;  // When done, free memory pointed to by a.
a = NULL;     // Clear a to prevent using invalid memory reference.

Source: fredosaurus.com

C++ allocate dynamic with initial values

int length = 50;
int *array = new int[length]();
// returns 50 length array of 0

C++ dynamic array

int n;                   //number of element
cin>>n;                 //input from user

int *arr=new int[n]     //array in heap

for(int i=0;i<n;i++)
{
   cin>>arr[i];        //input element in array
}

for(int i=0;i<n;i++)
{
   cout<<arr[i]<<" ";   //output element in array
}

delete[] arr;     //delete elements from array

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