Digital Electronics
A self-complementing code for the decimal digits is created using the weight 4 4 3 -2. The value of 8592 in the code is

 1100 1011 1111 1001
 1000 0101 1001 0010
 1100 0111 1111 0011
 1100 1001 1111 1000

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

0 any input causes the output to be at logic 0
1 at any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1
0 at any input causes the output to be at logic 1.

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