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Help with if statement RSS

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Last post Feb 20, 2012 01:30 PM by caponet

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caponet

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Help with if statement

Feb 20, 2012 11:35 AM|LINK
Hi,

Could someone help me to understand the logic behind this if statement?

Why the following statement returns true
```
If (129025 And 2048) = 2048 Then
```
and the following one returns false
```
If (129025 And 512) = 512 Then
```
Thank you
- Edited by caponet on Feb 20, 2012 11:36 AM
- Moved by XIII on Feb 20, 2012 11:39 AM
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Ramesh T

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827 Posts

Re: Help with if statement

Feb 20, 2012 11:55 AM|LINK

Hello Mate,

And operator (all logical operators) does bit wise operation, if it used in between integers.

Below is wat exactly u r doing

11111100000000001(129025 ) & 00000100000000000(2048) = 00000100000000000(2048)

and

11111100000000001(129025 ) & 00000001000000000(512) = 00000000000000000(0) which is not equal to 00000001000000000(512)
- Edited by Ramesh T on Feb 20, 2012 11:56 AM
- Edited by Ramesh T on Feb 20, 2012 12:03 PM
- Edited by Ramesh T on Feb 20, 2012 12:06 PM
- Edited by Ramesh T on Feb 20, 2012 12:08 PM
- Edited by Ramesh T on Feb 20, 2012 12:09 PM
- Marked as answer by caponet on Feb 20, 2012 01:29 PM
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sandeepmitta...

Contributor

6801 Points

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Re: Help with if statement

Feb 20, 2012 11:58 AM|LINK

The result has to do with binary "AND"

for the first case:

If (129025 And 2048) = 2048 Then

Binary of 129025 : 11111100000000001

Binary of 2048: 00000100000000000

when you "AND" this, you get "00000100000000000" equal to binary of 2048 so you get true.

second case:

If (129025 And 512) = 512 Then

Binary of 129025 : 11111100000000001

Binary of 512 : 00000001000000000

when you "AND" this, you get "00000000000000000" not equal to binary of 512 so you get false.

Sandeep Mittal | My Blog - IT Developer Zone
- Marked as answer by caponet on Feb 20, 2012 01:29 PM
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caponet

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Re: Help with if statement

Feb 20, 2012 01:30 PM|LINK

Thank you it makes sense