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Questions tagged [ones-complement]

The ones' complement of a numerical value is evaluated by performing a bitwise NOT operation on its binary representation.

The ones' complement of a numerical value is evaluated by performing a NOT operation on its binary representation.

Read also the wikipedia article on Ones' Complement.

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Why does ~0b1 print out -2 in Python 2.7?

I'm (somewhat) familiar with one's complement but I could use a refresher with regards to Python 2.7. Why does ~0b1 print out to -2? I understand that a one's complement converts 1s to 0s and vice versa. I expected ~0b1 to print 0b0 or 0. Does print…
MSD
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One's complement adder

I am not sure this is the proper section of the forum, in case please just let me know. I am studying Computer Organization and Design, and the legendary Patterson & Hannessy states that "One's complement adders did need an extra step to subtract a…
Worice
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The logic behind 1's complement and 2's complement

What is the logic behind obtaining the 1’s complement and 2’s complement by inverting the numbers and what is the mathematical reasoning behind this approches
arcanine
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What does ~ mean in Java?

I found a new symbol in a Java project and want to know what does it mean? systemUiVisibility & ~View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR What does ~ mean in this context?
Ichor de Dionysos
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Sum of powers of 2 in one's complement

Everyone has heard this joke by Bill Gosper: The myth that any given programming language is machine independent is easily exploded by computing the sum of powers of 2. If the result loops with period = 1 with sign +, you are on a sign-magnitude…
Leopold says Reinstate Monica
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Does the complement have any impact on Fletcher's checksum?

The Wikipedia article for Fletcher's checksum states: These examples assume two's complement arithmetic, as Fletcher's algorithm will be incorrect on one's complement machines. This SO question provides a scan from a book that says: Addition is…
ian
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Trying to understand one's complement

I was going through some problems so that I could understand one's complement and had a question about one similar to this. If this binary number is in one's complement format already: 1010 1111 1111 What decimal number does it represent? Am I…
Eric Smith
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Does the sign-bit change when using one's or two's complement?

I've been struggling with what seems like simple concepts, but I seem to keep combining and mixing up binary conversions. If you are given a number in binary and apply 1's complement, you invert all bits. Making the 0's 1's and 1's 0's. For 2's…
ModdedLife
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how to calculate the one's complement for positive and negative number?

If I use one's complement to represent number, what result should I get? For example, number 01110 ( a positive number),its one's complement should be 01110 or 10001? if the number is 10001 ( a negative number), the one's complement value is 01110? …
Dean Chen
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Converting hex to binary and one and two's complement in 16 bits

I am trying to convert FFAD (hex) to a decimal value and then do one and two's complement on it. FFAD is represented as a 16 bit integer. When I convert FFAD to base 2 I get 1111111110101101. My problem is how I know if it is a negative number or…
Cheesegraterr
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Excess and complement representation range

Theoretical question: If my polarization in 2s complement and 2^8, the range of numbers I can represent goes from -127 to +127. What if I am in 16s complement and polarization is (16^3)/2, I have 512 positive numbers and 512 negative numbers I can…
Drive Knight
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In fxpmath does the signed syntax represent the negative numbers as 1's complement only? If yes, how do I change it to 2's complement?

from fxpmath import Fxp c = Fxp(complex(3.2500+2.0625j), True, 8, 4) # (val, signed, n_word, n_frac) print(c) print((c).bin()) # binary representation d = Fxp(complex(2.0625+5.2500j), True, 8, 4) # (val, signed, n_word,…
mohammed zeeshan
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One's Complement in MIPS

I am trying to find the one-s complement of a binary number using MIPS in QtSpim. Firstly I measure the string length and then check if a character is 0 or not making the necessary transformations. The following code always returns "000..0". Any…
bluebird
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Why complement of 0 is -1?

I was learning about bitwise operators and I learnt that complement of 0 is 1 and 1 is 0. But when I tried using ~0 on IDLE, it printed -1 and when i typed ~1 it gave -2..
Satyam Shankar
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Nine's complement with positive and negative decimal values Question

"If the number is positive, the nine's complement of the number is itself." I read this on a book named "Foundation of Computer Science", it said that the 9's complement of +234 is +234. Meanwhile, I looked for some turtorials on Youtube, however,…
Jim
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