Paper I · 9 Logical Reasoning & Analytical Ability · 9.7 Coding–decoding

9.7.4 Input–output (machine) coding

A word–number machine changes a line of elements one step at a time by a fixed rule; find the rule from the worked example (which element moves, where it goes, what happens to the rest), then rerun the machine on the new input on paper.

  • APPSC Paper I · Paper I
  • Standard level
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Key terms

  • input-output
  • machine coding
  • word and number arrangement
  • shifting machine
  • swapping machine
  • operation machine
  • steps
  • last step
  • number of steps
  • finding a step
  • reverse working
  • dictionary order
  • ascending and descending order

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Common trapsFoundation
  5. Quick revisionFoundation

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