Pointer

/*
    1. Relationship between pointer and array
    2. Pointer as function parameters in program
    3. Pointer to structure

*/

#include <iostream>
using namespace std;

void display(int *);

struct robotStruct
{
    string model;
    int version;
};

int main()
{
    // 1. Relationship between pointer and array

    int array[5] = {1,2,3,4,5};

    cout << "array: " << array << endl; // array without index is address, 0x0001
    cout << "array[0]: " << array[0] << endl; // array with index is data, 1
    cout << "array + 1: " << (array+1) << endl << endl;

    int *ptr_array = array; // same since array already in address form

    // array access
    cout << "array[0]: " << array[0] << endl; // index array is data, 1
    cout << "ptr_array[0]: " << ptr_array[0] << endl; // index pointer is data, 1
    cout << "(array+1): " << (array+1) << endl; // array++ without index is adding 1 to address, 0x0001+1 = 0x0002
    cout << "*(array+1): " << *(array+1) << endl << endl; // dereference array++ same array[0+1], 2

    // 2. function in pointer
    display(ptr_array);

    // 3. pointer to structure
    robotStruct robot0 = {"UAV",5};

    robotStruct *rPtr;
    rPtr = &robot0;

    cout << "rPtr.model: " << rPtr -> model << endl; // UAV
    cout << "(*rPtr).version: " << (*rPtr).version << endl; // 5

}

void display(int *ptrTemp)
{
    cout << "ptrTemp: " << ptrTemp << endl; // 0x0002
    cout << "*ptrTemp: " << *ptrTemp << endl; // 1
    cout << "*(ptrTemp+1): " << *(ptrTemp+1) << endl << endl; // 2
}