Topic       : C-Language Documentation
Author      : John Kormylo
Version     : C.HYP 1.0
Subject     : Documentation/C-Language
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Index Size  : 6362
HCP-Version : 3
Compiled on : Atari
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View Ref-File[ Unary Operators ]

... have only one operand (usually the Rvalue); e.g., -x.

-  Unary minus: change sign of Rvalue.
+  Unary plus: return value of Rvalue (no change).
~  One's Complement: invert all bits in Rvalue.
!  Logical Not: replace Rvalue TRUE with FALSE or FALSE with TRUE.
   (0 is FALSE, anything else is TRUE.)
*  Indirection (Rvalue must be a pointer): returns what the pointer
   was pointing to.
&  Address (Rvalue must NOT be a register): returns the address of the
   Rvalue.

++ Increment: add one to variable (changes variable).
   Pre-increment (++Rvalue) returns incremented Rvalue.
   Post-increment (Lvalue++) returns Lvalue before increment.

-- Decrement: subtract one from variable (changes variable).
   Pre-decrement (--Rvalue) returns decremented value.
   Post-decrement (Lvalue--) returns value before decrement.

sizeof returns number of bytes for type or variable name.

(<type>) converts Rvalue from one data type to another, where <type>
   is the desired data type.