Thesis » QuynhNguyen-MS

/*

TESTING POINTER

*/

#include <stdio.h>

#include <iostream>

using namespace std;

int func_reference(int& r)

{

    // cout << "*r = " << *r << endl; // ERROR

    cout << "&r = " << &r << endl;

    cout << "r = " << r << endl;

    r = 5;

    cout << "r = " << r << endl;

}

int main()

{

    int ** ramon;

    int *paul;

    int melissa = 5;

    paul = &melissa;

    ramon = &paul;

    printf("ramon = %d\n", ramon);

    printf("&paul = %d\n", &paul);

    printf("*ramon = %d\n", *ramon);

    printf("&melissa = %d\n", &melissa);

    printf("**ramon = %d\n", **ramon);

    int * xuan;

    xuan = &melissa;

    printf("*xuan = %d\n", *xuan);

    printf("&xuan = %d\n", &xuan);

    int* quynh;

    quynh = &melissa;

    printf("*quynh = %d\n", *quynh);

    printf("&quynh = %d\n", &quynh);

    const char * name = "ABCDE";

    std::cout << name;

    std::cout << "\n";

    // printf("&name = %s\n", &&name);

    printf("name = %s\n", name); // ABCDE

    printf("&(*name) = %s\n", &(*name)); // ABCDE

    printf("*name %%c = %c\n", *name); // A

    printf("*name %%u = %u\n", *name); // 65, some number, and it's the number of the address

    printf("*name %%d = %d\n", *name); // 65, some number, and it's the number of the address

    printf("(*name + 1) %%d = %d\n", (*name + 1)); // 66, some number, and it's the number of the address

    printf("(*name + 1) %%c = %c\n", (*name + 1)); // B

    printf("name[1] = %c\n", name[1]); // B

    cout << endl;

    cout << "******* Pass by reference ********" << endl << endl;

    int x = 16;

    cout << "# int arr[] = {7, 11, 13};" << endl;

    int arr[] = {7, 11, 13};

    cout << "arr = \t\t" << arr << endl;

    cout << "&(*arr)) = \t" << &(*arr) << endl;

    cout << "&arr = \t\t" << &arr << endl;

    cout << "&arr = " << long(&arr) << endl;

    cout << "??? why why why, plusing with 4, resulting in plusing with 16 ???" << endl;

    cout << "sizeof(int) = " << long(sizeof(int)) << endl;

    cout << "arr + sizeof(int) = " << long(arr + sizeof(int)) << endl;

    cout << "arr + 2*sizeof(int) = " << long(arr + 2*sizeof(int)) << endl;

    cout << "//" << endl;

    cout << "&arr + sizeof(int) = " << long(&arr + sizeof(int)) << endl;

    cout << "arr + 4 = " << long(arr + 4) << endl;

    cout << "arr + 8 = " << long(arr + 8) << endl;

    cout << "&arr[1] = " << &arr[1] << endl;

    cout << "*(&arr[1]) = " << *&arr[1] << endl;

    cout << "arr[1] = " << arr[1] << endl;

    cout << endl;

    cout << "# char char_arr[] = {'x', 'u', 'a', 'n', '\0'};" << endl;

    char char_arr[] = {'x', 'u', 'a', 'n', '\0'};

    cout << "char_arr = " << char_arr << endl;

    cout << "*char_arr = " << *char_arr << endl;

    cout << "&char_arr = " << &char_arr << endl;

    cout << "&(*char_arr) = " << &(*char_arr) << endl;

    cout << "??? Why char_arr is printed out completely, why arr only print number 10???";

    cout << endl << endl;

    cout << "### ['x', 'u', 'a', 'n']" << endl;

    char char_arr_2[] = {'x', 'u', 'a', 'n', '\0'};

    cout << "char_arr = " << char_arr_2 << endl;

    cout << "*char_arr = " << *char_arr_2 << endl;

    cout << "&(*char_arr) = " << &(*char_arr_2) << endl;

    func_reference(x);

    func_reference(*arr);

}