int類型究竟佔幾個字節

       最近在看深入理解計算機系統這本書，上面提到了在32位機器和64機器中int類型都佔用4個字節。後來，查了The C Programming language這本書，裏面有一句話是這樣的：Each compiler is free to choose appropriate sizes for its own hardware, subject only to the restrict

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