Adders using structural modeling in Verilog HDL

Write VERILOG code for Full adder. Use VERILOG code of full adder as component and using structural methodology write VERILOG code for 4-bit adder and 8-bit adder. Show output with at least four combinations of input in single waveform for 8-bit adder. Verilog code is written and simulated using Vivado 15.3 version.