Creating plot via TF1 library

I want to create a plot with a TF1 function in my C++ program. For compiling I use

g++ *.cpp $(root-config --cflags --glibs)

and that works just fine.

But when I do ./a.out afterwars it just won't show me the canvas it created (it says in the shell that a canvas C1 was created).

I already tried using a dummy with cin >> dummy but that doesn't work either