In C ++ new and delete to create and release a dynamic array in C ++ new and delete to create and release a dynamic array

In C ++ new and delete to create and release a dynamic array

 

In C ++ programming, then create an array using the new release to delete.

First, create and release a one-dimensional array

 

#include<iostream>
using namespace std;
int main ()
{
    int n;
    cin>>n;
    // assign a dynamic one-dimensional array 
    int *arr=new int[n];
    
    for(int i=0;i<n;i++)
        cin>>arr[i];
    for(int i=0;i<n;i++)
       cout<<arr[i]<<" ";
    // release the array arr 
    delete[] arr;
    return 0;
}

Note: [] can not be less behind the delete.

Second, create and release a two-dimensional array

 

#include<iostream>
using namespace std;
int main ()
{
    int row,col;
    cin>>row>>col;
    // allocate space for the row pointer 
    int **arr=new int *[row];    
    for(int i=0;i<row;i++)
         arr [i] = new int [col]; // allocate space for each row (each line has elements col) 
    // Enter the number of two-dimensional array 
    for(int i=0;i<row;i++)
        for(int j=0;j<col;j++) 
        cin>>arr[i][j];
    cout<<"*******************"<<endl;
     // output the number of two-dimensional array  
    for(int i=0;i<row;i++)
    {
         for(int j=0;j<col;j++) 
          cout<<arr[i][j]<<" ";
        cout<<endl;
    } 
    // release the two-dimensional array (turn) 
    for(int i=0;i<row;i++)
        delete[] arr[i]; 
    delete[] arr;
    return 0;
}

In C ++ programming, then create an array using the new release to delete.

First, create and release a one-dimensional array

 

#include<iostream>
using namespace std;
int main ()
{
    int n;
    cin>>n;
    // assign a dynamic one-dimensional array 
    int *arr=new int[n];
    
    for(int i=0;i<n;i++)
        cin>>arr[i];
    for(int i=0;i<n;i++)
       cout<<arr[i]<<" ";
    // release the array arr 
    delete[] arr;
    return 0;
}

Note: [] can not be less behind the delete.

Second, create and release a two-dimensional array

 

#include<iostream>
using namespace std;
int main ()
{
    int row,col;
    cin>>row>>col;
    // allocate space for the row pointer 
    int **arr=new int *[row];    
    for(int i=0;i<row;i++)
         arr [i] = new int [col]; // allocate space for each row (each line has elements col) 
    // Enter the number of two-dimensional array 
    for(int i=0;i<row;i++)
        for(int j=0;j<col;j++) 
        cin>>arr[i][j];
    cout<<"*******************"<<endl;
     // output the number of two-dimensional array  
    for(int i=0;i<row;i++)
    {
         for(int j=0;j<col;j++) 
          cout<<arr[i][j]<<" ";
        cout<<endl;
    } 
    // release the two-dimensional array (turn) 
    for(int i=0;i<row;i++)
        delete[] arr[i]; 
    delete[] arr;
    return 0;
}