Description |
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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.
