wts mean of this statement??

Question

In 2’s complement the significant information is contained in the 1’s of positive numbers and 0’s of the negative numbers.

Comments

source of the statement?

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Which of the following statement(s) is
(are) not correct ?
i. The 2’s complement of 0 is 0.
ii. In 2’s complement, the left most bit cannot be used to express a
quantity.
iii. For an n-bit word (2’s complement) which includes the sign bit, there are 2n–1 positive integers, 2n+1 negative integers and one 0 for a total of 2n unique states.
iv. In 2’s complement the significant information is contained in the 1’s of positive numbers and 0’s of the negative numbers.

(A) i & iv (B) i & ii (C) iii (D) iv

Answer 1

Integer		2's Complement
Signed	Unsigned
5	5	0000 0101
4	4	0000 0100
3	3	0000 0011
2	2	0000 0010
1	1	0000 0001
0	0	0000 0000
-1	255	1111 1111
-2	254	1111 1110
-3	253	1111 1101
-4	252	1111 1100
-5	251	1111 1011

look at the above example.

The most significant (leftmost) bit indicates the sign of the integer; therefore it is sometimes called the sign bit.

 

If the sign bit is zero,

then the number is greater than or equal to zero, or positive.

If the sign bit is one,

then the number is less than zero, or negative.

Comments

 but these stament saying opposite ryt?  .In 2’s complement the significant information is contained in the 1’s of positive numbers and 0’s of the negative numbers.

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No I think it is correct.see the positive numbers,left half of each number are all 0's...only the 1's in the right side contains significant information vice versa in case of negative numbers.

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ok thx,.

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"for +ve number only the 1's in the right side contains significant information " i get that , but for negetive number how 0`s contains significant information . please explain . 

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@pranay  for negative number eft half of each number are all 1's so only 0 contains signification information on right side