C / C++ / MFC

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

for (int i=0;i < maxKeySize;i++)
{
  // create the i<sup>th</sup> key
  KeyType key(i);
  if (Decrypt(data, key) == something_that_looks_like_plaintext)
  {
     all done.
     break;
  }
}

<br />
#define BIT_ZERO_FLAG (1 << 0)<br />
#define BIT_ONE_FLAG (1 << 1)<br />
#define BIT_TWO_FLAG (1 << 2)<br />

<br />
if ((flag & BIT_ONE_FLAG) == BIT_ONE_FLAG)<br />
{<br />
  .. bit one was set ..<br />
}<br />

<br />
#define IsBitSet(_data,_bitpos) (((_data) & (1 << _bitpos))==(1 << _bitpos))<br />
<br />
// test to see if bit 5 is set<br />
bool bBit5IsSet = IsBitSet(flags, 5);<br />

<br />
#define FLAG1 0x0001<br />
#define FLAG2 0x0002<br />
#define FLAGn n<br />
<br />
// test DWORD flags for FLAG1<br />
if( flags & FLAG1 )<br />
{<br />
  // do something flag specific<br />
}<br />
<br />
// if some flag bits overlap<br />
if( (flags & FLAG2) == FLAG2 )<br />

// this...
if (data & BIT_POSITION_VALUE == BIT_POSITION_VALUE)
{
...
}

// is not the same as this.
if ((data & BIT_POSITION_VALUE) == BIT_POSITION_VALUE)
{
...
}