C Program to calculate the number of elements that are separating the pointers

#include <stdio.h>
#include <stdlib.h>
int main()
{
    //create an array of structure;
    int aiData[] = {1,2,3,4,5};
    //Create two pointer to the integer
    int *piData1 = NULL;
    int *piData2 = NULL;
    int iOffset = 0;
    //Assign the address of array first element to the pointer
    piData1 = &aiData[0];
    //Assign the address of array third element to the pointer
    piData2 = &aiData[2];
    // Subtract the pointer
    iOffset = piData2 - piData1;
    printf("pointer offset  =  %d\n\n",iOffset);
    
    return 0;
}

Output:

pointer offset =  2.