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View Ref-File[ Logical Operators ]

... return either TRUE (-1) or FALSE (0).

==  Equal: return TRUE if operands are equal.
!=  Not Equal: return TRUE if operands are not equal.

<   Less Than: return TRUE if Lvalue is less than Rvalue.
>   Greater Than: return TRUE if Lvalue is greater than Rvalue.

<=  Less Than or Equal: return TRUE if Lvalue is less than or equal to
     Rvalue.

=>  Equal or Greater Than: return TRUE if Lvalue is greater than or
     equal to Rvalue.

&&  Logical And: return TRUE if both operands are TRUE.
||  Logical Or: return TRUE if either operand is TRUE.

Note: Logical expressions are actually implemented using branches, so
      if the Lvalue of an && is FALSE, or the Lvalue of an || is TRUE,
      then the Rvalue is never evaluated.
      The order in which expressions are evaluated can have a
      significant effect on program speed and reliability.

See also Unary Operators !