回答編集履歴
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refine
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@@ -27,3 +27,15 @@
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（Teratail/Markdownの制約から 2のn乗 を 2^n と表記しています）
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下記StackOverflowのQ&Aもご参考に：
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* [interpret signed as unsigned](https://stackoverflow.com/q/1751346/684921)
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* [Using -1 as a flag value for unsigned (size_t) types](https://stackoverflow.com/q/22801069/684921)
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* [Is there a difference between -1 and ~0?](https://stackoverflow.com/q/24650019/684921)
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refine
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@@ -18,7 +18,11 @@
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同Noteは、符号付き整数が2の補数表現の場合、ビット幅切詰めが生じない限り、この変換でビットパターンが保持されるという（ある意味自明な）補足説明になっています。
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> If the destination type is unsigned, the resulting value is the least unsigned integer congruent to the source integer (modulo 2^n where n is the number of bits used to represent the unsigned type). [Note: In a two's complement representation, this conversion is conceptual and there is no change in the bit pattern (if there is no truncation). -- end note]
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