Combinatorial logic adder????????

1, one adder is also called a full adder (a full adder is the basis of the addition operation)

One Full adder truth table:

Xi	Yi	Ci-1	Si	Ci
0	0	0	0	0
0	0	1	1	0
0	1	0	1	0
0	1	1	0	1
1	0	0	1	0
1	0	1	0	1
1	1	0	0	1
1	1	1	1	1

One full-add schematic:

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2, parallel adder is also called Super Forward Bit adder (excerpt from "Verilog Digital system Design Tutorial (second edition)" Charlie Xia)

It is important to note that:

The parallel adder is the super-forward bit adder by deducing the logical operation, knowing in advance the digits of each bit, and the following formula is the result of the rounding down of each of you.

The serial adder is a design that can be seen through the connection of our circuit, without the logical derivation of the operation

and Marching Position formula:

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Combinatorial logic adder????????