How to use launch terminal？

[threestone_wang]

I use “printf（）” to send message to my computer.is it right to use "printf"?

[KnarfB]

what board are you using?
see How to write your question to maximize your chance... - STMicroelectronics Community 

printf on a STM32 will not automagically be directed to your computer.

The following app note has more info on printf debugging:

STM32 microcontroller debug toolbox - Application note

hth

KnarfB