Problems of input(scanf cin ) while running C/C++ with Textmate 2

I'm using Textmate2 as my coding editor.But what i found is that scanf in c or cin in c++ can't work in Textmate2.I googled for a while.And the solution seems to install a library into Textmate support path.The path can be located by running a shell command "echo "$TM_SUPPORT_PATH"".So i did it.Downloaded the tm_interactive_input.dyllb,copy it into the lib folder in the support path.Everything seems to be the same as the blog told me to do.However ,it still does work.I don't know why.The version of Textmate2 i'm using is Textmate2.0 beta 7.1,the latest version.Do i have any alternatives to fix this problem?