This example demonstrates how pointer arithmetic can be used to access array elements in reverse order. Instead of incrementing the pointer, the pointer is decremented to move backwards through memory.

#include <stdio.h>

int main()
{
    int arr[5] = {10, 20, 30, 40, 50};
    int *ptr;
    int i;

    ptr = &arr[4];

    for (i = 0; i < 5; i++)
    {
        printf("%d ", *ptr--);
    }

    printf("\n");

    return 0;
}

Output:

50 40 30 20 10

ptr is initialized with the address of the last element of the array.

*ptr accesses the value at the current address, and ptr-- moves the pointer to the previous integer element.

Since ptr is an int *, decrementing the pointer moves the address backwards by sizeof(int) bytes.

In the expression *ptr--, dereferencing happens first using the current address, and the pointer is decremented afterwards.

This is equivalent to:

*(ptr--)

Pointer decrement is commonly used while traversing arrays in reverse order.