Value of b masked by the inverse of the value of a?

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Hi, I am not clear about this question in C++? Can you please help me with this.
...

1. how do I get the inverse? is there way in bitwise operator?
2. when say mask, does it mean OR or AND mask?

Thanks agian.

What I have tried:

return b |= inverse(a); // is this correc?

Posted 6-Nov-22 15:16pm

suresh ganeshan

Updated 7-Nov-22 6:47am

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11917640 Member 7-Nov-22 6:44am

return (b & (~a));

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Rick York · Answer 1 · 2022-11-06T16:03:00

The tilde symbol is one way : ~. It is the binary negation operator. The boolean negation operator is the exclamation mark : !. The docs : cplusplus.com : operators[^].

What you tried, the |=, is the or equals operation.

ETA: You can display an integer in hexadecimal format like this :

C

printf( "integer value is %08X\n", integerValue );

That format specifier, the %08X part, would display eight hex digits with leading zeros.

CPallini · Answer 2 · 2022-11-07T06:47:00

Quote:
1. how do I get the inverse? is there way in bitwise operator?

Yes, there is, as Rick already suggested, it is the bitwise NOT (~, see Arithmetic operators - cppreference.com[^]).

Quote:
2. when say mask, does it mean OR or AND mask?

Usually is it an AND mask.

To summarize (as 11917640 Member suggested)

C++

(b & (~a))

should do the trick.

suresh ganeshan · Answer 3 · 2022-11-07T04:36:00

Solution 2

unsigned char operator(unsigned char a, unsigned char b)
{

    return (b |= reverse(a);
}

Posted 7-Nov-22 4:36am

suresh ganeshan

Comments

merano99 8-Nov-22 12:39pm

You propose yourself a solution? If yes, you should explain it, if no it belongs rather above under "What I have tried".

Value of b masked by the inverse of the value of a?

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