Topic       : C-Language Documentation
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View Ref-File[ Unary Operators: sizeof ]

Syntax:
                     sizeof( <type> )
                     sizeof( <name> )
                     sizeof <name>

where <type> is a data type and <name> is the name of a variable,
structure, union, or array.  It returns the size of the operand in
bytes as a long word.

While sizeof looks like a function, it is actually a unary operator
and will be pre-computed by the compiler along with any other constant
expressions.

sizeof(double) depends on whether the -8 option is used.
(See Compiler Options).


Note: To determine the number of elements in an array, use

  sizeof(array_name) / sizeof(array_name[0]);