CODEWITHSUNDEEP
binarybinary-datadata-conversion
Evan Bechtol
Evan Bechtol

Reputation: 2865

Converting decimal to 2's complement

I am working on converting decimal numbers to 2's Complement binary numbers. I understand the concept;

  1. Convert the number to Hex (Base 16)
  2. Convert the result into binary (padding to 8-digits)
  3. Invert all bits and add 1

so I have been trying to convert 92(base 10)

92 -> Hex = 5c
5C == 5 12 -> Binary = 01011100
Inverting = 10100011
           +       1
           =10100100

But an online converter I used to check my answer says: 01011100 What did I do wrong? I know that the most-significant bit should be 0, as the number is positive. But other than that, I am confused.

update

Is this because positive numbers do not need to be switched for sign magnitude? Therefore, the number remains the same before and after doing 2's complement?

Meaning, the answer that I obtained is actually the negative interpretation; -92?

Upvotes: 1

Views: 6277

Answers (1)

JBaczuk
JBaczuk

Reputation: 14609

Only invert it and add 1 when you're trying to represent a negative number, positive numbers are represented with normal binary. (You just get less range in the positive numbers).

Upvotes: 3

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