this is an adder code in vhdl...

fulladder
.........\FOURBITADD_beh.prj
.........\FOURBITADD_isim_beh.exe
.........\fourbitadd_isim_beh.wfs
.........\FOURBITADD_stx.prj
.........\FOURBITADD_summary.html
.........\fulladder.ise
.........\fulladder.ise_ISE_Backup
.........\fulladder.restore
.........\fulladder_tbw.xwv
.........\fulladder_tbw.xwv_bak
.........\fulladder_tbw_bencher.prj
.........\full_adder.vhd
.........\isim
.........\....\temp
.........\....\....\hdllib.ref
.........\....\....\hdpdeps.ref
.........\....\....\sub00
.........\....\....\.....\vhpl00.vho
.........\....\....\.....\vhpl01.vho
.........\....\work
.........\....\....\fourbitadd
.........\....\....\..........\fouradder_structure.h
.........\....\....\..........\mingw
.........\....\....\..........\.....\fouradder_structure.obj
.........\....\....\..........\xsimfouradder_structure.cpp
.........\....\....\hdllib.ref
.........\....\....\hdpdeps.ref
.........\....\....\sub00
.........\....\....\.....\vhpl00.vho
.........\....\....\.....\vhpl01.vho
.........\isim.cmd
.........\isim.hdlsourcefiles
.........\isim.log
.........\isim.tmp_save
.........\.............\_1
.........\isimwavedata.xwv
.........\pepExtractor.prj
.........\simulate_dofile.log
.........\templates
.........\xilinxsim.ini
.........\xst
.........\...\work
.........\...\....\hdllib.ref
.........\...\....\hdpdeps.ref
.........\...\....\sub00
.........\...\....\.....\vhpl00.vho
.........\...\....\.....\vhpl01.vho
.........\_xmsgs
.........\......\fuse.xmsgs
.........\......\vhpcomp.xmsgs
.........\__ISE_repository_fulladder.ise_.lock

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