So the code instructs the FPGA (or, more accurately, the Verilog compiler) to examine the number and set dispoutput based on the input. The <= character, by the way, are a non-blocking assignment.

This paper focuses on the implementation and simulation of 4-bit, 8-bit and 16-bit carry look-ahead adder based on Verilog code and compared for their performance in Xilinx. ...

Parallel prefix adder is the most flexible and widely used for binary addition. Parallel prefix adders are best suited for VLSI implementation. Numbers of ...