【ISO/ANSI/JIS】 C言語なら俺に聞け！ Part 132

【ISO/ANSI/JIS】 C言語なら俺に聞け！ Part 132 at TECH

189:デフォルトの名無しさん
07/09/23 17:55:52
>>127,146-147,166
(unsigned int)(-1) は 6.3.1.3 p2 により UINT_MAX と同じになる。

"if the new type is unsigned, the value is converted by repeatedly adding or
subtracting one more than the maximum value that can be represented in the new type
until the value is in the range of the new type."

-(unsigned int)1 は 6.2.5 p9 により UINT_MAX と同じになる。

"A computation involving unsigned operands can never overflow,
because a result that cannot be represented by the resulting unsigned integer type is
reduced modulo the number that is one greater than the largest value that can be
represented by the resulting type."

引用は ISO のドラフト (n1124) からね。

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