Garbage in, garbage out
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Garbage in, garbage out.
Prov. If you give nonsensical instructions to people or computers, those instructions will produce nonsensical results. Jill: Why is my computer generating all this gibberish? Jane: You must have made a mistake in the program. Garbage in, garbage out. Ed insists that children are so ignorant nowadays because their teachers are incompetent. "Garbage in, garbage out," he says.
Garbage in, garbage out.(mainly American)
something you say which means that something produced from materials of low quality will also be of low quality The meals are pretty poor but then they never use fresh ingredients - garbage in, garbage out.