For applications of fewer than 300 LOC, “Fewer than one defect expected” certainly meets a loose definition of “Bug-free”.
As an example of a program with no defects, I put forth the Overpower Scram Logic for a particular pressurized water reactor. It runs on specialized hardware which can be diagrammed fully in the documentation, but is normally shown as a ‘black box’ with several digital and one analog input, and one digital output.
For applications of fewer than 300 LOC, “Fewer than one defect expected” certainly meets a loose definition of “Bug-free”.
As an example of a program with no defects, I put forth the Overpower Scram Logic for a particular pressurized water reactor. It runs on specialized hardware which can be diagrammed fully in the documentation, but is normally shown as a ‘black box’ with several digital and one analog input, and one digital output.