Standard C++ Library Reference ISO/IEC (VERSION3)

promotes its type to one of these. If all of the values representable in the original type are also

representable as type int, then the promoted type is int. Otherwise, the promoted type is

unsigned int. Thus, for signed char, short, and any signed bitfield type, the promoted type is int.

For each of the remaining integer types (char, unsigned char, unsigned short, any plain bitfield

type, or any unsigned bitfield type), the effect of these rules is to favor promoting to int

wherever possible, but to promote to unsigned int if necessary to preserve the original value in

all possible cases.

An rvalue expression is an expression whose value can be determined only when the program

executes. The term also applies to expressions which need not be determined until program

execution.

You use the sizeof operator, as in the expression sizeof X to determine the size in bytes of

an object whose type is the type of X. The translator uses the expression you write for X only to

determine a type; it is not evaluated.

A void expression has type void.

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