#include <bits/stdc++.h>
using namespace std;

int main()
{
    // char c = 0xff; // signed char
    unsigned char c = 0xff;
    cout << c << endl;
    // cout << (char)254 << endl;

    cout << (int)c << endl;
    cout << (unsigned int)c << endl;
    printf("%d\n", c); // c => 0xff ff ff ff c => 0x00 00 00 ff
    printf("%u\n", c); // c => 0xff ff ff ff c => 0x00 00 00 ff
    // a + b

    /*
    cout << (int)c << endl;
    cout << (char)-1 << endl;
    cout << (char)129 << endl;
    cout << (char)255 << endl;
    */

    return 0;
}