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C++ Program to Allocate Memory using new[ ] and delete[ ]

This C++ program illustrates memory allocation and de-allocation using new and delete keywords. The space for one-dimensional and two-dimensional arrays can be allocated and de-allocated using these keywords. In case of two-dimensional array, the array first allocated is that for holding pointers to further one-dimensional arrays.

Here is the source code of the C++ program illustrates memory allocation and de-allocation using new and delete keywords. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Allocate Memory using new[] and delete[]

```
 */
```
```
#include <iostream>
```
```
 
```
```
int main()
```
```
{
```
```
    int size;
```
```
    int sizex, sizey;
```
```
 
```

    std::cout << "Enter the size of one-dimensional array ";

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    std::cin >> size;
```
```
    // One-dimensional array
```
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    int *arr = new int[size];
```
```
    for (int i = 0; i < size; i++)
```
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        std::cin >> arr[i];
```
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    delete[] arr;
```
```
    // Two-dimensional array
```

    std::cout << "Enter the size of two-dimensional array ";

```
    std::cin >> sizex >> sizey;
```
```
    int ** arr_2d = new int*[sizex];
```
```
    for(int i = 0; i < sizex; i++)
```
```
        arr_2d[i] = new int[sizey];
```
```
    for (int i = 0; i < sizex; i++)
```
```
    {
```
```
        for(int j = 0; j < sizey; j++)
```
```
            std::cin >> arr_2d[i][j];
```
```
    }
```
```
    // Deleting array completely
```
```
    for(int i = 0;i < sizex; i++)    
```
```
        delete[] arr_2d[i];
```
```
}
```

$ a.out
Enter the size of one-dimensional array 2
1 3
Enter the size of two-dimensional array 2 2
1 2
3 4