Hello community

I start a little 3D software.

I use my keyboard to change the shape to display (ex : press '1' to display the A shape, press '2' to display the B shape, ....)
To be sure I use in the function printf to display the pressed key.

So when I press a key, the key is not printed in the standard output and the shape is not changed.

But when I close the program, the outputs are printed at once.

I don't understand what to do to correct the problem......

Thank you for your help.