gray code is a quasi-weighted code. assume that the lowest bit of gray code is n=1, then the absolute value of the weight of gray code is (2^n)-1, and its sign alternates between positive and negative from left to right. a typical gray code is a single-step self-complement code with reflective and cyclic characteristics. its cyclic and single-step characteristics eliminate the possibility of major errors when randomly taking numbers. its reflection and self-complementary characteristics make inversion very convenient. . gray code is a reliable coding method that minimizes errors.