What’s the function of this circuit?

Explanation:
Function of circuit
The circuit is a "full adder". Its S output is the least-significant bit of the binary sum of the inputs A, B, C. Its C output is the most-significant bit of that 2-bit binary sum. The "S" and "C" refer to "sum" and "carry", respectively.
Truth table
See the attachment for the truth table. The column in gray is the decimal representation of the sum of the inputs A, B, C.
Answer:
Function of circuit
The circuit is a "full adder". Its S output is the least significant bit of the binary sum of the inputs A, B, C. Its C output is the most-significant bit of that 2-bit binary sum. The "S" and "C" refer to "sum" and "carry", respectively.
The circuit is a "full adder". Its S output is the least significant bit of the binary sum of the inputs A, B, C. Its C output is the most-significant bit of that 2-bit binary sum. The "S" and "C" refer to "sum" and "carry", respectively.Truth table
The circuit is a "full adder". Its S output is the least significant bit of the binary sum of the inputs A, B, C. Its C output is the most-significant bit of that 2-bit binary sum. The "S" and "C" refer to "sum" and "carry", respectively.Truth tableSee the attachment for the truth table. The column in gray is the decimal representation of the sum of the inputs A, B, C.