Diminished Radix Complement

Diminished Radix Complement Representation:

In the decimal number system the diminished radix complement is 9’s complement. This is obtained by subtracting each digit of the number from 9.

Decimal Number





9’s Complement





The diminished radix complement of binary numbers is called 1’s complement. The 1’s complement of a binary number is formed by replacing each 1 in the number by a 0 and each 0 by 1.

For example, 1’s complements of some binary numbers are;

Binary Number



1’s Complement



In the case of signed magnitude representation of binary numbers, the MSB is the sign bit.

Positive number representations are same for both 1’s and 2’s complement. But representation of negative numbers differs by 1. A weight of -(2n-1 - 1) rather than -2n-1 is given to the MSB while computing the decimal equivalent of 1’s complement of a binary number.

A few examples of 8-bit binary numbers and their 1’s complement are given below;

Binary Number

(i)                          01010001

1’s complement         10101110

(ii)                         10101000

1’s complement         01010111

Decimal Equivalent


          -127 + 46 = -81

          -127 + 40 = -87


Binary Numbers

  • Why Binary Numbers are Used
  • Binary to Decimal Conversion
  • Conversion of Numbers
  • Hexa-decimal Number System
  • Conversion of Binary Numbers to Octal or Hexa-decimal Numbers
  • Octal and Hexa-Decimal Numbers
  • Signed-magnitude Representation
  • Radix Complement
  • Diminished Radix Complement
  • Arithmetic Operations of Binary Numbers

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