Written using C expression calculator, not only can complete the four operations, but also can deal with a number of functions computing, you can tie in with graphviz to draw the expression tree and calculation process.

计算器
......\bin
......\...\calc.exe
......\...\graphviz
......\...\........\bin
......\...\........\...\cdt.dll
......\...\........\...\config
......\...\........\...\dot.exe
......\...\........\...\graph.dll
......\...\........\...\gvc.dll
......\...\........\...\gvplugin_dot_layout.dll
......\...\........\...\gvplugin_pango.dll
......\...\........\...\iconv.dll
......\...\........\...\libcairo-2.dll
......\...\........\...\libexpat.dll
......\...\........\...\libfontconfig-1.dll
......\...\........\...\libfreetype-6.dll
......\...\........\...\libgobject-2.0-0.dll
......\...\........\...\libpango-1.0-0.dll
......\...\........\...\libpangocairo-1.0-0.dll
......\...\........\...\libpangoft2-1.0-0.dll
......\...\........\...\libpangowin32-1.0-0.dll
......\...\........\...\libpng12.dll
......\...\........\...\libxml2.dll
......\...\........\...\lneato.exe
......\...\........\...\ltdl.dll
......\...\........\...\pathplan.dll
......\...\........\...\Settings.ini
......\...\........\etc
......\...\........\...\fonts
......\...\........\...\.....\conf.avail
......\...\........\...\.....\..........\10-autohint.conf
......\...\........\...\.....\..........\10-no-sub-pixel.conf
......\...\........\...\.....\..........\10-sub-pixel-bgr.conf
......\...\........\...\.....\..........\10-sub-pixel-rgb.conf
......\...\........\...\.....\..........\10-sub-pixel-vbgr.conf
......\...\........\...\.....\..........\10-sub-pixel-vrgb.conf
......\...\........\...\.....\..........\10-unhinted.conf
......\...\........\...\.....\..........\20-fix-globaladvance.conf
......\...\........\...\.....\..........\20-lohit-gujarati.conf
......\...\........\...\.....\..........\20-unhint-small-vera.conf
......\...\........\...\.....\..........\30-amt-aliases.conf
......\...\........\...\.....\..........\30-urw-aliases.conf
......\...\........\...\.....\..........\40-generic.conf
......\...\........\...\.....\..........\49-sansserif.conf
......\...\........\...\.....\..........\50-user.conf
......\...\........\...\.....\..........\51-local.conf
......\...\........\...\.....\..........\60-latin.conf
......\...\........\...\.....\..........\65-fonts-persian.conf
......\...\........\...\.....\..........\65-nonlatin.conf
......\...\........\...\.....\..........\69-unifont.conf
......\...\........\...\.....\..........\70-no-bitmaps.conf
......\...\........\...\.....\..........\70-yes-bitmaps.conf
......\...\........\...\.....\..........\80-delicious.conf
......\...\........\...\.....\..........\90-synthetic.conf
......\...\........\...\.....\..........\README
......\...\........\...\.....\conf.d
......\...\........\...\.....\......\20-fix-globaladvance.conf
......\...\........\...\.....\......\20-lohit-gujarati.conf
......\...\........\...\.....\......\20-unhint-small-vera.conf
......\...\........\...\.....\......\30-amt-aliases.conf
......\...\........\...\.....\......\30-urw-aliases.conf
......\...\........\...\.....\......\40-generic.conf
......\...\........\...\.....\......\49-sansserif.conf
......\...\........\...\.....\......\50-user.conf
......\...\........\...\.....\......\51-local.conf
......\...\........\...\.....\......\60-latin.conf
......\...\........\...\.....\......\65-fonts-persian.conf
......\...\........\...\.....\......\65-nonlatin.conf
......\...\........\...\.....\......\69-unifont.conf
......\...\........\...\.....\......\80-delicious.conf
......\...\........\...\.....\......\90-synthetic.conf
......\...\........\...\.....\fonts.conf
......\...\........\...\.....\fonts.dtd
......\...\........\...\gtk-2.0
......\...\........\...\.......\gdk-pixbuf.loaders
......\...\........\...\.......\gtk.immodules
......\...\........\...\.......\gtkrc
......\...\........\...\pango
......\...\........\...\.....\pango.aliases
......\...\........\...\.....\pango.modules
......\...\........\lib
......\...\........\...\lefty
......\...\........\...\.....\box.lefty
......\...\........\...\.....\def.lefty
......\...\........\...\.....\dotty.lefty
......\...\........\...\.....\dotty_draw.lefty
......\...\........\...\.....\dotty_edit.lefty
......\...\........\

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