Priority Encoder is a combinational digital circuit, that take 2^n input lines and encodes it to n output signal lines. For instance for a 8x3 priority encoder the output lines with respect to 8, i.e.

priority encoder 4:2 (behavioral and dataflow). 8-bit barrel shifter (behavioral), and 4-bit ALU. Now, let's explore the different modeling styles in Verilog: behavioral, dataflow, and structural.