Your understanding is correct, but this part of the book is wrong (you read it carefully! )。 (011...11)+1followed by 10...000.-32768' s complement is1. The complement of each negative number of a short integer is:

10...000: -32768

10...00 1: -32767

10...0 10: -32766

......

1 1... 100: -4

1 1... 10 1: -3

1 1... 1 10: -2

1 1... 1 1 1: - 1