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Programare, proiecte personale, divertisment

/*********************************************

 * Acest program prezinta niste metode de    *

 * accesare a memoriei la nivel de bit.      *

 *                                           *

 * In program se declara niste variabile     *

 * de diferite tipuri, care se initializeaza *

 * cu niste valori si apoi se afiseaza       *

 * continutul lor bit cu bit.                *

 *                                           *

 *      Copyright (C) Uzun Dumitru 2008      *

 *********************************************/

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//Scoate barele de comentariu de mai jos daca doresti sa se separe semioctetii prin spatii

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//#define SPATII

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//-------------------------------------------------

#if defined(SPATII)

    #define PUNESPATII cout<<' '

#else

    #define PUNESPATII

#endif

//-------------------------------------------------

#include <stdio.h>

#include <conio.h>

#include <iostream.h>

//-------------------------------------------------

#define pBit(addr, bit) ( ( ((char*)(addr))[bit>>3] & (1<<((bit)&7)) ) != 0 )   // Valoarea bitului nr bit de la adresa addr

#define pBitSet(addr, bit, val) (((char*)(addr))[bit>>3]^= ( ((char*)(addr))[bit>>3] & (1<<((bit)&7)) )^(((val)!=0))<<((bit)&7))

#define var_bits(var) show_bits(&var, sizeof(var)<<3)

//-------------------------------------------------

void show_bits(void*, size_t);  // Afiseaza un nr de bitsi de la adresa indicata

//-------------------------------------------------

void main(void)

{

    clrscr();

//-------------------------------------------------

     /* Variabile pentru testare */

     char c         = 0;

     int i          = -32768;

     long int l     = 0x0f00ff0f;

     float f        = 123.5;

     double d       = 0.000123456;

     long double ld = 1246.123456;

//-------------------------------------------------

    /* Afisarea variabilelor bit cu bit */

    var_bits(c);

    var_bits(i);

    var_bits(l);

    var_bits(f);

    var_bits(d);

    var_bits(ld);

    cout<<'\n';

//-------------------------------------------------

    getch();

}

//-------------------------------------------------

void show_bits(void *var, size_t bits){

     while (bits--)

     {

         cout<<char('0'+pBit(var, bits));

         if(!(bits&3)) PUNESPATII;

     }

     cout<<'\n';

}

//-------------------------------------------------

#define pByteBit(addr, B, bit) pBit((char*)(addr)+(B), bit)  // Valoarea bitului 'bit' al byte-ului 'B' de la adresa 'addr'

//-------------------------------------------------

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