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On x86 systems char is generally signed. On arm systems it is generally unsigned (Apple iOS is an exception).
The rest part of the ASCII is known as extended ASCII. Using char or signed char we cannot store the extended ASCII values. By using the unsigned char, we can store the extended part as its range is 0 to 255.
A signed char is a signed value which is typically smaller than, and is guaranteed not to be bigger than, a short . An unsigned char is an unsigned value which is typically smaller than, and is guaranteed not to be bigger than, a short .
unsigned char ch = 'a'; Initializing an unsigned char: Here we try to insert a char in the unsigned char variable with the help of ASCII value. So the ASCII value 97 will be converted to a character value, i.e. 'a' and it will be inserted in unsigned char.
Following the question titled Warning generated due wrong strcmp parameter handling, there seems to be some questions regarding what the Standard actually guarantees regarding value representation of character types.
This looks fine, but does the Standard guarantee that the (1) will always yield true?
char unsigned * p1 = ...; char * p2 = reinterpret_cast<char *> (p1); *p1 == *p2; // (1) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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