What is the largest positive value that can be represented by an 8 bit 2’s complement number

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VSSC ISRO Technical Assistant Electronics 14 July 2021 Official Paper
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  1. 127
  2. 128
  3. 255
  4. 256

Answer (Detailed Solution Below)

Option 1 : 127
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Two's complement representation, or, in other words, signed notation - the first bit tells about the sign.

The convention is that a number with a leading 1 is negative, while a leading 0 denotes a positive value.

In an 8-bit representation, we can write any number from -128 to 127.

The name comes from the fact that a negative number is a two's complement of a positive one.

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