The weighted codes are those that obey the position weighting principle, which states that the position of each number represent a specific weight. In weighted codes, each digit is assigned a specific weight according to its position. Non-weighted or un-weighted codes are those codes in which the digit value does not depend upon their position i.e., each digit position within the number is not assigned fixed value. Examples of non-weighted codes are: Un-weighted BCD code, Excess-3 code and gray code.
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