Page 9 - Sample_test_Float

Functions and Pointers 9

5.2.8. Pointer and Array
An array and pointer go hand in hand with each other. An array can be accessed by using pointer. Arrays
and pointers are synonymous in terms of how they use to access memory. But the important difference
between them is that a pointer variable can take different addresses as value, whereas in case of array it is
fixed.

Relation between Arrays and Pointers
Array elements are stored in consecutive memory location.

Example 1

Consider and array:
int arr[4];

arr
arr[0] arr[1] arr[2] arr[3]

Figure: Array as Pointer

In arrays of C programming, name of the array always points to the first element of an array. Here, address of
first element of an array is &arr[0].arr represents the address of the pointer where it is pointing. Hence, &arr[0]
is equivalent to arr.
The statement
int arr[1]={10};
is

equivalent to
int *arr;
arr[0]=10;
arr = &a[0];

Similarly,
&a[1] is equivalent to (a+1)AND, a[1] is equivalent to *(a+1).
&a[2] is equivalent to (a+2)AND, a[2] is equivalent to *(a+2).

&a[3] is equivalent to (a+1)AND, a[3] is equivalent to *(a+3).
&a[i] is equivalent to (a+i) AND, a[i] is equivalent to *(a+i).

In C, you can declare an array and can use pointer to access the elements of an array