unsigned char size
From C11 5.2.4.2.1. The values given below shall be replaced by constant expressions suitable for use in #if preprocessing directives. Moreover, except for CHAR_BIT and MB_LEN_MAX, the following shall be replaced by expressions that have the same type as,However, i can store 11 bytes in unsigned char array[10]. No, you cannot: 10 is not a valid index of array[10] . Arrays are indexed from zero to size minus one. According to C99 Standard. 6.5.3.4.3 When [ sizeof operator is] applied to an operand that has,Type, Storage size, Value range. char, 1 byte, -128 to 127 or 0 to 255. unsigned char, 1 byte, 0 to 255. signed char, 1 byte, -128 to 127. int, 2 or 4 bytes, -32,768 to 32,767 or -2,147,483,648 to 2,147,483,647. unsigned int, 2 or 4 bytes, 0 to 65,535 or , However if this is just a pointer to unsigned char which has no relation to a C style string, then there is no way to reliably achieve what you're looking for. C / C++ does not associate a length field with a pointer. You'll need to pass the leng, You can do this with an array: size_t size = sizeof array;. with your example that give: ssize_t count = write(file, buff, sizeof buff); if (count < 0 || (size_t)count != sizeof buff) perror("FAIL to write on exit-n"); }. Note: I use C sema,分類, 類型, 內容. 整數, char, char 類型是通常包含基本執行字元集成員的整數類資料類型；根據預設，這是Microsoft C++ 中的ASCII。 C++ 編譯器會將類型為 char 、 signed``char 和 unsigned``char 的變數視為具有不同的類型。 除非使用/J 編譯選項，否則會將 char 類型的變數提升為 int ，就如同這些變數已預設為 signed``char 類型 ... ,這個...雖然很基本，但確很重要關鍵字位長範圍printf chars char 1 -128..127 (或0..255，與體系結構相關) %c unsigned char 1 0. ,
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 unsigned char size 相關參考資料
About the size of unsigned char type in C++ - Stack Overflow
From C11 5.2.4.2.1. The values given below shall be replaced by constant expressions suitable for use in #if preprocessing directives. Moreover, except for CHAR_BIT and MB_LEN_MAX, the following shal... https://stackoverflow.com c - why sizeof unsigned char array[10] is 10 - Stack Overflow
However, i can store 11 bytes in unsigned char array[10]. No, you cannot: 10 is not a valid index of array[10] . Arrays are indexed from zero to size minus one. According to C99 Standard. 6.5.3.4.3 Wh... https://stackoverflow.com C Data Types
Type, Storage size, Value range. char, 1 byte, -128 to 127 or 0 to 255. unsigned char, 1 byte, 0 to 255. signed char, 1 byte, -128 to 127. int, 2 or 4 bytes, -32,768 to 32,767 or -2,147,483,648 to 2,1... https://www.tutorialspoint.com c++ - How do you determine the length of an unsigned char ...
However if this is just a pointer to unsigned char which has no relation to a C style string, then there is no way to reliably achieve what you're looking for. C / C++ does not associate a length... https://stackoverflow.com linux - C++ unsigned char array length - Stack Overflow
You can do this with an array: size_t size = sizeof array;. with your example that give: ssize_t count = write(file, buff, sizeof buff); if (count < 0 || (size_t)count != sizeof buff) perror(&quo... https://stackoverflow.com 基本類型(C++) - MSDN - Microsoft
分類, 類型, 內容. 整數, char, char 類型是通常包含基本執行字元集成員的整數類資料類型；根據預設，這是Microsoft C++ 中的ASCII。 C++ 編譯器會將類型為 char 、 signed``char 和 unsigned``char 的變數視為具有不同的類型。 除非使用/J 編譯選項，否則會將 char 類型的變數提升為 int ，就如同這些變數已預設為 signed... https://msdn.microsoft.com 資料型態(datatype) @ 新手筆記之Linux全記錄:: 痞客邦::
這個...雖然很基本，但確很重要關鍵字位長範圍printf chars char 1 -128..127 (或0..255，與體系結構相關) %c unsigned char 1 0. http://note1.pixnet.net 資料類型範圍 - MSDN - Microsoft
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