[C Knowledge Point]char unsigned char signed char knowledge point

1.char,unsigned Char, signed char is a single byte.

A 2.signed char range of 128-127 0000 0000 means +0 1000 0000 represents-0. The values of +0 and 0 represent the same value. In order not to waste this bit with 1000 0000 means 128
The unsigned char range is 0-256.
3. Char is interpreted as signed char or unsigned char, depending on the compiler.

The 4.VC compiler, GCC on x86, defines Char as signed char, while ARM-LINUX-GCC defines char as unsigned char.

5.signed Char and unsigned char are represented in memory as a binary string of 01 combinations, different only in the way they are interpreted. There is also a point that is not assigned to int, the high-level extension is different.

Reference URL:

"1" http://blog.sina.com.cn/s/blog_5a3744350100xapg.html

"2" http://cppkey.com/archives/318

[C Knowledge Point]char unsigned char signed char knowledge point