Numeric comparison tests: multi-part

Numeric comparison tests: multi-part

Prerequisite Concepts

An unparenthesized comparison can consist of more than two parts, provided that the parts are compatible. The operator "!=" is never permitted in a multi-part comparison, and "<" or "<=" cannot be mixed with ">" or ">=".

A multi-part numeric comparison must consist of operators from either one or the other of the following sets (but not both):

"=", "<", or "<="
"=", ">", or ">="

For example, all of the following are valid multi-part numeric comparison tests:

  do when a = b = c = d
  ...
  done

  do when a < b < c < d
  ...
  done

  do when a >= b >= c >= d
  ...
  done

  do when a <= b = c < d
  ...
  done

  do when a = b & b = c & c = d
  ...
  done

  do when a < b & b < c & c < d
  ...
  done

  do when a >= b & b >= c & c >= d
  ...
  done

  do when a <= b & b = c & c <d
  ...
  done

Prerequisite Concepts
   Arithmetic and comparison operators
   Numeric expressions
   Precedence of numeric operators

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