#include <iostream>

using namespace std;

int main () {
    char aChar;
    unsigned char smallNumber;

    cout << "sizeof(char) = " << sizeof(char) << endl;
    cout << "sizeof(aChar) = " << sizeof(aChar) << endl;
    cout << "sizeof(unsigned char) = " << sizeof(unsigned char) << endl;
    cout << "sizeof(smallNumber) = " << sizeof(smallNumber) << endl;
    cout << endl << endl;

    // show what happens when we try subtract 1 from 0
    smallNumber = 1;
    cout << "smallNumber = " << int(smallNumber) << endl;
    cout << endl;

    smallNumber = char(int(smallNumber) - 1);
    cout << "smallNumber = smallNumber - 1;" << endl; 
    cout << "smallNumber =  " << int(smallNumber) << endl;
    cout << endl;

    smallNumber = smallNumber - 1;
    cout << "smallNumber = smallNumber - 1;" << endl; 
    cout << "smallNumber =  " << int(smallNumber) << endl;
    cout << endl;

    cout << endl << endl;

    smallNumber = 254;
    cout << "smallNumber = " << int(smallNumber) << endl;
    cout << endl;

    smallNumber++;
    cout << "smallNumber++;" << endl; 
    cout << "smallNumber =  " << int(smallNumber) << endl;
    cout << endl;

    smallNumber++;
    cout << "smallNumber++;" << endl; 
    cout << "smallNumber =  " << int(smallNumber) << endl;
    cout << endl;
    
    cout << endl << endl;

    aChar = 1;
    cout << "aChar = " << int(aChar) << endl;
    cout << endl;

    aChar = aChar - 1;
    cout << "aChar = aChar - 1;" << endl; 
    cout << "aChar =  " << int(aChar) << endl;
    cout << endl;

    aChar = aChar - 1;
    cout << "aChar = aChar - 1;" << endl; 
    cout << "aChar =  " << int(aChar) << endl;
    cout << endl;

    cout << endl << endl;

    aChar = 126;
    cout << "aChar = " << int(aChar) << endl;
    cout << endl;

    aChar++;
    cout << "aChar++;" << endl; 
    cout << "aChar =  " << int(aChar) << endl;
    cout << endl;

    aChar++;
    cout << "aChar++;" << endl; 
    cout << "aChar =  " << int(aChar) << endl;

    return 0;
}