Константный указатель на целое

int *const dgt;

int x;
int *const dgt = &x;

dgt = &y;

const int x = 100; // требуется инициализатор
x = 200; // ошибка, х - константа

int i = 345;
 
const int *s = &i; //нету никакой ошибки
 
i = 23 //вот здесь уже ошибка
*s = 44 // И здесь

#include "stdafx.h"
#include <iostream>
 
using namespace std;
 
int _tmain(int argc, _TCHAR* argv[])
{
    cout << "Size of char" << sizeof(char) << endl;
    cout << "Size of int"  << sizeof(short int) << endl;
    cout << "Size of char" << sizeof(int) << endl;
    cout << "Size of long int" << sizeof(long int) << endl;
    cout << "Size of float" << sizeof(float) << endl;
    cout << "Size of double" << sizeof(double) << endl;
    cout << "Size of long double" << sizeof(long double) << endl;
    cout << "Size of signed int" << sizeof(signed int) << endl;
    cout << "Size of unsigned int" << sizeof(unsigned int) << endl;
    cout << "Size of char*" << sizeof(char*) << endl;
    cout << "Size of int*"  << sizeof(short int*) << endl;
    cout << "Size of char*" << sizeof(int*) << endl;
    cout << "Size of long int*" << sizeof(long int*) << endl;
    cout << "Size of float*" << sizeof(float*) << endl;
    cout << "Size of double*" << sizeof(double*) << endl;
    cout << "Size of long double*" << sizeof(long double*) << endl;
    cout << "Size of signed int*" << sizeof(signed int*) << endl;
    cout << "Size of unsigned int*" << sizeof(unsigned int*) << endl;
    return 0;
}

        ...
    system ( "PAUSE" );
    return 0;
}

#include <cstdlib>