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I have the paid version of qcad but I cannot do well with the x and y commands, previously used in Robocad under DOS (school version) I took a look in Babacad and if you draw a line there you have a window where you can enter the length that at Qcad too? it would help me a lot.
Greetings
Hubert

If you know the angle, you can use:
Draw > Line > Line from Angle
or
Draw > Line > Horizontal Line
or
Draw > Line > Vertical Line

For all of these tools, you can enter the length in the options toolbar at the top.

Otherwise, you could use
Draw > Line > Line from 2 Points

and restrict the length in the options toolbar: