###### Computer-Organization

October 14, 2023###### UGC NET CS 2006 June-Paper-2

October 14, 2023# Digital-Logic-Design

Question 525 |

**An example of a self complementing code is :** 8421 code | |

Gray code | |

Excess-3 code | |

7421 code |

**Question 525 Explanation:**

**→ Excess-3 code is also called Self-Complementing Code. Because 1’s complement of excess-3 number is equivalent to 9’s complement of corresponding decimal digit.**

→ In excess-3 code, each of the 4-bit number represents decimal digit which is 3 less than actual decimal digit. So the bits have no fixed weight.

→ Excess-3 code is neither CRC nor Algebraic Code which are used for error detection and/or correction.→ In excess-3 code, each of the 4-bit number represents decimal digit which is 3 less than actual decimal digit. So the bits have no fixed weight.

→ Excess-3 code is neither CRC nor Algebraic Code which are used for error detection and/or correction.

Correct Answer: C

**Question 525 Explanation:**

**→ Excess-3 code is also called Self-Complementing Code. Because 1’s complement of excess-3 number is equivalent to 9’s complement of corresponding decimal digit.**

→ In excess-3 code, each of the 4-bit number represents decimal digit which is 3 less than actual decimal digit. So the bits have no fixed weight.

→ Excess-3 code is neither CRC nor Algebraic Code which are used for error detection and/or correction.→ In excess-3 code, each of the 4-bit number represents decimal digit which is 3 less than actual decimal digit. So the bits have no fixed weight.

→ Excess-3 code is neither CRC nor Algebraic Code which are used for error detection and/or correction.

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