What does !Convert.ToBoolean() mean?

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I came across a code that looks something like:

bool[] leds = new bool[3*64];
int[] audionr = new int[4];
int audiosound;

public int AudioSound
{
get {return audiosound;}
set {audiosound = value;}
}

....//further on in code
leds[audionr[0]] = !Convert.ToBoolean(this.AudioSound & 0x001);

What does this "!Convert.ToBoolean" do/mean in this scenario?

Posted 15-Oct-15 1:09am

Member 11971544

Updated 15-Oct-15 1:23am

v2

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Solution 2

!Convert.ToBoolean() mean that it just negate the result coming from Convert.ToBoolean()
if Convert.ToBoolean() return true then !Convert.ToBoolean() is false and if Convert.ToBoolean() return false then !Convert.ToBoolean() is true.

Posted 20-Oct-15 23:38pm

PANKAJMAURYA

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phil.o · Accepted Answer · 2015-10-15T01:18:00

Solution 1

! is the binary negation operator.
!true returns false
!false returns true

Convert.ToBoolean(this.AudioSound) producing a boolean value from an int value (meaning, returns false if int value is zero, otherwise returns true), this code is assigning the boolean value at index zero in leds table to the negation of the conversion of the int value AudioSound.

As to why this code doas that, it's impossible to answer without studying the algorithm and figure out how the leds table is used.

Posted 15-Oct-15 1:18am

phil.o

Comments

Krunal Rohit 15-Oct-15 7:21am

Ta, 5!

-KR

Member 11971544 15-Oct-15 7:31am

Hi @phil.o, thanks for your response just updated the code as I missed a little part out. I'm trying to fully comprehend your explanation, are you saying:
!Convert.ToBoolean(this.AudioSound & 0x001)means if AudioSound = 0, it will return false and if its > 0 then it returns true?

phil.o 15-Oct-15 7:38am

(this.AudioSound & 1) just transform the original AudioSound int value into zero or one, depending on the fact it is odd or even (one for odd, zero for even).
If (this.AudioSound & 1 == 0) (AudioSound is even), Convert.ToBoolean(this.AudioSound & 1) will return false, and the negation will make the result true.
If (this.AudioSound & 1 == 1) (AudioSound is odd), Convert.ToBoolean(this.AudioSound & 1) will return true, and the negation will make the result false.

Member 11971544 15-Oct-15 7:40am

I get it now. Thank you.

Member 11971544 15-Oct-15 9:03am

what if it looks something like: !Convert.ToBoolean(this.AudioSound & 0x002)what is the transformation here?

Matt T Heffron 21-Oct-15 13:06pm

Same as above, except it is checking a different bit in this.AudioSound.
0x002 would be the bit next to the even/odd bit.
This would imply that this.AudioSound is a collection of boolean values represented as bits in an integer value. The different powers-of-2 will mask the different bit Booleans.