Final answer:
To use a pointer instead of an integer to keep track of an array, we can store the memory address of the first element in a pointer variable, and use pointer arithmetic to access other elements of the array.
Step-by-step explanation:
When we want to keep track of an array using a pointer instead of an integer, we can use a pointer variable to store the memory address of the first element in the array. By performing pointer arithmetic, we can access the other elements of the array. For example, if we have an array named 'arr' and we want to access the third element, we can use the pointer 'ptr' and increment it by 2 (since array indexing starts at 0).
Here's an example:
int arr[] = {10, 20, 30, 40, 50};
int *ptr = arr; // storing the address of the first element in 'ptr'
// accessing the third element
int thirdElement = *(ptr + 2); // ptr is incremented by 2 to access the third element
printf("Third element: %d", thirdElement);
In the above example, we declare an integer array 'arr' and a pointer 'ptr'. We store the address of the first element of 'arr' in 'ptr', and by incrementing 'ptr' by 2, we can access the third element of the array.