HP 3000 Manuals HP 3000 Manuals
The sizeof Operator
The sizeof operator is used to determine the size (in bytes) of a data
object or a type.
Syntax
sizeof unary-expression
sizeof (type-name)
Description
The result of the sizeof operator is an unsigned int constant expression
equal to the size of its operand in bytes. You can use the sizeof
operator in two different ways. First, you can apply the sizeof operator
to an expression. The result is the number of bytes required to store
the data object resulting from the expression. Second, it may be
followed by a type name inside parentheses. The result then is the
number of bytes required to store the specified type.
In either usage, the sizeof operator is a compile-time operator that you
can use in place of an integer constant.
The usual conversion of arrays of T to pointers to T is inhibited by the
sizeof operator. The sizeof operator returns the number of bytes in an
array rather than the number of bytes in a pointer.
When you apply the sizeof operator to an expression, the expression is
not compiled into executable code. This means that side effects
resulting from expression evaluation do not take place.