I am unable to get the logic for showing that the problem of whether a Turing machine prints something is undecidable by showing that the halting problem reduces to it. Please guide me with this.
2026-03-29 17:26:59.1774805219
Show that the problem of deciding whether a Turing machine prints something is undecidable
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Given any TM $M$, construct a TM $M'$ which is the same as $M$ except that the only time it will print something is just before halting. Then if I can decide the "printing problem", I can run my decision procedure on $M'$ and I have decided the halting problem on $M$.