RE: Convert int to bitstring

[Wagner, David --- Senior Programmer Analyst --- WGO]

Title: Convert int to bitstring

    Here is one using printf and you could use sprintf:

 

$_ = "255.255.255.224";

 

foreach ( split(/\./, $_ ) ) {
    printf "%b\n", $_;
 }
 

Output:

11111111
11111111
11111111
11100000

 

Wags ;)

-----Original Message-----
From: Bullock, Howard A. [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, December 18, 2002 10:26
To: [EMAIL PROTECTED]
Subject: Convert int to bitstring

I want to convert int(255) to a string of 8 ones (11111111). I have been trying to use unpack, but am missing something basic I think.

I was also playing with the following with less than successful results. What am I doing wrong? One guess was the the @mask elements are string values and the bitwise operation are not performing as I initially expected.

$mask = "255.255.255.224";

@mask = split(/\./,$mask,4);

$mymaskval = ($mask[0]<<24)|($mask[1]<<16)|($mask[2]<<8)|$mask[3];

$setbits = unpack("%32b*", $mymaskval);

I have read the unpack docs but did not see references to the "%" and "*" in "%32b*". Can someone explain this as well.

Howard A. Bullock

Global IT Infrastructure

717-810-3584



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