Can some explain this please.

[RedEyedDog]

Hi could some please explain what kind of variable this is :
unsigned int endIp=(
ipEnd[0]<<24 |
ipEnd[1]<<16 |
ipEnd[2]<<8 |
ipEnd[3]);



And also how does the "(iterator & 0xFF000000)>>24" part of this loop work

for(iterator= startIp; iterator<endIp; iterator++)
{
printf("%d.%d.%d.%d\n",
(iterator & 0xFF000000)>>24,
(iterator & 0x00FF0000)>>16,
(iterator & 0x0000FF00)>>8,
(iterator & 0x000000FF)
);
}
Thank you people :)

[keskiverto]

Read about binary operators: bitshift (<<, >>), AND (&), OR (|).

[RedEyedDog]

Hi do understand bit shift operating but not sure whats going on here.

if this is :
unsigned int startIp=(
ipStart[0]<<24 |
ipStart[1]<<16 |
ipStart[2]<<8 |
ipStart[3]);

Then what will iterator start as? say for ipStart[0] =192. Does this mean ipstart[0]=192000000000000000000000?

I suppose my main confusin is the variables startip and end ip?

[keskiverto]

That is equivalent to:

unsigned int startIp =
  ipStart[0] * 256*256*256 +
  ipStart[1] * 256*256 +
  ipStart[2] * 256 + ipStart[3];

[RedEyedDog]

Ok thanks. Ow and i've realised how stupid my second reply was :( sorry for that, my head feels empty today.

[dhayden]

For what it's worth, it looks like this code

unsigned int endIp=(
ipEnd[0]<<24 |
ipEnd[1]<<16 |
ipEnd[2]<<8 |
ipEnd[3]);

is converting from a big-endian format to the local host format. Otherwise you could code it as

unsigned int endIp = *(unsigned int*)ipEnd;