[HaBo]

#include <iostream>

using namespace std;

// Gibt einzelne Bits eines chars aus
void printBinary(const unsigned char val) {
    for(int i = 7; i >= 0; i--)
    if(val & (1 << i))
    std::cout << "1";
    else
    std::cout << "0";
    cout <<"\n";
}

int main(void) {
    char x = 0x00;
    
    printBinary(x);
    
    // binäre oder verknüpfung, um bits zu setzen
    x = x | 0x13;
    
    printBinary(x);
    
    // binäre und verknüpfung, um bits zu setzen
    x = x & 0x02;
    
    printBinary(x);
    
    cout <<"\n";
    system("PAUSE"); 
}

#include <stdio.h>
#include <string.h>

char* int2bin(unsigned int a);

void main()
{
char str[9], byte;
gets(str); //der eingelesene string enthält nur nullen und einsen
byte = str2char(str); //diese funktion brauche ich
printf("%s = %s", str, int2bin(byte));
}

char* int2bin(unsigned int a)
{
  static char s[9];
  int i;

  for( i = 8; i >= 0; --i )
    {
      s[i] = ( (a & 0x1) == 0) ? '0' : '1';
      a >>= 1;
    }
  s[8] = '\0';
  return s;
}

//get bit at <pos> in <arr> ( counting starts at 0)
bool BitManip::getBitAt(unsigned char* arr,unsigned int pos)
{
	if((int)arr==0)
		return 0;
	int arrpos=(int)((pos)/8);
	return (bool)((arr[arrpos] & (int)(pow(2,7-(pos%8)))) >> ((7-(pos%8))));
}
//set bit at <pos> in <arr> to <state> (counting starts at 0)
int BitManip::setBitAt(unsigned char* arr,unsigned int pos,bool state)
{
	if((int)arr==0)
		return BitManip::EINVALID_PARAM;
	if(state)
	{
		arr[(int)((pos)/8)] = arr[(int)(pos/8)] | (int)(pow(2,7-(pos%8)));
	}
	else
	{
		arr[(int)(pos/8)] = arr[(int)(pos/8)] & (~(int)(pow(2,7-(pos%8))));
	}
}
//rotate left <arr>, interpreted as a value with <bitcnt> bits, <count> times
int BitManip::rol(unsigned char* arr,unsigned int bitcnt,unsigned int count)
{
	unsigned char* orig;
	unsigned int length;
	if(bitcnt==0 || count == 0 || (int)arr==0)
		return BitManip::EINVALID_PARAM;
	if(bitcnt%8!=0)
		length = ((int)(bitcnt/8)) + 1;
	else
		length = bitcnt/8;
	orig = new unsigned char[length];
	for(unsigned int i=0;i<count;++i)
	{
		for(unsigned int i=0;i<length;++i)
		{
			orig[i]=arr[i];
		}
		for(unsigned int j=0;j<bitcnt;++j)
		{
			unsigned int pos=(j==bitcnt-1)?0:j+1;
			setBitAt(arr,j,getBitAt(orig,pos));
		}
	} 
        delete orig;
	return 0;
}

char str2char(char *str)
{
  char byte;
  int i=0;
  while(str[i] != '\0')
  {
    if(str[i] == '0')
      byte = byte&(~(int)(pow(2,7-(i%8))));
    else
      byte = byte|(int)(pow(2,7-(i%8)));
    i++;
  }
  return byte;
}