Cannot draw when I doesn't using root prompt

ROOT
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ROOT Version: v6 (git clone from and it is the latest)
Platform: Ubuntu18.04
Compiler: g++ & cmake

Hi, I am a new user of root, I want to draw something using TCanvas. I use the member function Draw() of TCanvas.

I compile the code instead of root prompt. It compiled well, but when I want to run it, it didn’t show anytime and even have errors. However, when I run it in root prompt, it can show the graph. I am curious about it. Could you help me about it? Thank you!

BTW, I can creat a pdf and print the graph in this pdf file. So maybe it is the problem about Draw()?

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Hi @jiangxkjohn ,
and welcome to the ROOT forum.

Please see Standalone C program runs without error but doesn't display histogram - #2 by eguiraud and I draw a canvas with no picture, they should help.

Cheers,
Enrico

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Thank you! It works well!

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