Pointers’ Arithmetic

Why did we go deep into arrays while learning pointers? The fact is that the array’s name is a pointer to its first element.

We can get the address of the first element of the array by its name or by declaring the pointer:


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int arr[5]{1, 2, 3, 4, 5};
int *p = &arr[0];

cout << p << endl;
cout << arr << endl;

In other words, indexing is equivalent to adding (or substructing) to the pointer:


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cout << *(p+2) << endl;   // equivalent to arr[2]
cout << *(arr+2) << endl; // equivalent to arr[2]

The for loop we used to go through the arrays can also be used with pointers by adding 1 on each step, but we will use these feature pointers in work with functions and dynamic memory in the following sections.

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Section 2. Chapitre 5

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