/*
    operazioni con i singoli bit

*/

#include <stdio.h>

int main() {
  int i;
  unsigned char a=0, b, c, d;

  printf("a = %u  [0x%X] \n", a, a);

  puts("\n Ci mettiamo 1");
  a = 1;
  printf("a = %u  [0x%X] \n", a, a);

  a = 1;
  puts("\n spostiamo il primo bit a sinistra 7 volte");
  for (i=0; i<7; i++) {
    a = a << 1;
    printf("a = %3u  [0x%2X] \n", a, a);
  }
  
  //----------------------------------------------------

  puts("\n Settiamo tutti i bit a 1");
  a = 0b11111111;
  printf("a = %3u  [0x%X] \n", a, a);

  puts("\n definiamo altre due variabili con 4 bit ON");
  b = 0b00001111;
  printf("b = %3u  [0x%2X] \n", b, b);
  c = 0b11110000;
  printf("c = %3u  [0x%2X] \n", c, c);

  puts("\nOra facciamo AND e OR fra le variabili");
  printf("b | c = %3u  [0x%2X] \n", b|c, b|c);
  printf("b & c = %3u  [0x%2X] \n", b&c, b&c);
  printf("a & b = %3u  [0x%2X] \n", a&b, a&b);
  printf("a & c = %3u  [0x%2X] \n", a&c, a&c);
  printf("a | b = %3u  [0x%2X] \n", a|b, a|b);
  printf("a | c = %3u  [0x%2X] \n", a|c, a|c);

  puts("\nFacciamo anche qualche XOR");
  printf("b ^ c = %3u  [0x%2X] \n", b^c, b^c);
  printf("a ^ b = %3u  [0x%2X] \n", a^b, a^b);
  printf("a ^ c = %3u  [0x%2X] \n", a^c, a^c);
 
  
  puts("\nNegazioni");
  printf("~a = %3u  [0x%2X] \n", (unsigned char) ~a, (unsigned char) ~a);
  printf("~b = %3u  [0x%2X] \n", (unsigned char) ~b, (unsigned char) ~b);
  printf("~c = %3u  [0x%2X] \n", (unsigned char) ~c, (unsigned char) ~c);
  printf("~(~a) = %3u  [0x%2X] \n",
    (unsigned char) ~(~a), (unsigned char) ~(~a));
  
  printf("~0b10000001 = %3u  [0x%2X] \n",
    (unsigned char) ~0b10000001, (unsigned char) ~0b10000001);

  puts("\nAltri esempi di shift");
  printf("b << 4; %3u  [0x%2X] \n",  (unsigned char)b<<4,  (unsigned char)b<<4);
  printf("c >> 4; %3u  [0x%2X] \n",  (unsigned char)c>>4,  (unsigned char)c>>4);
  d = b << 6;
  printf("d = (b << 6); %3u  [0x%2X] \n",  (unsigned char) d,  (unsigned char) d);
  printf("d >> 6; %3u  [0x%2X] \n",  (unsigned char) d>>6,  (unsigned char) d>>6);
  puts("\n(i bit persi... sono persi)");
  
  return 0;
}