So I recognize that the difference between a signed int and also unsigned int is the a little is supplied to signify if the number if positive or negative, but how does this apply to a char? How deserve to a character be confident or negative?



There"s no dedicated "character type" in C language. Char is an integer type, very same (in the regard) together int, short and also other essence types. Char simply happens to be the the smallest integer type. So, simply like any other creature type, it can be signed or unsigned.

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It is true the (as the name suggests) char is greatly intended come be provided to represent characters. However characters in C are represented by your integer "codes", so there"s nothing unexplained in the fact that an integer kind char is used to offer that purpose.

The only general difference in between char and also other integer varieties is that level char is not associated with signed char, while with other integer species the signed modifier is optional/implied.


I slightly disagree v the above. The unsigned char simply means: usage the most significant bit instead of treating it together a bit flag for +/- sign once performing arithmetic operations.

It makes definition if you usage char together a number because that instance:

typedef char BYTE1;typedef unsigned char BYTE2;BYTE1 a;BYTE2 b;For variable a, just 7 bits are obtainable and its range is (-127 come 127) = (+/-)2^7 -1.For variable b all 8 bits are available and the range is 0 come 255 (2^8 -1).

If you use char together character, "unsigned" is completely ignored through the compiler just as comment are removed from your program.



There room three char types: (plain) char, signed char and unsigned char. Any type of char is typically an 8-bit integer* and also in the sense, a signed and also unsigned char have a useful definition (generally indistinguishable to uint8_t and also int8_t). When offered as a personality in the feeling of text, use a char (also described as a plain char). This is commonly a signed char yet can be enforced either method by the compiler.

* Technically, a char have the right to be any size as lengthy as sizeof(char) is 1, yet it is generally an 8-bit integer.

Representation is the same, the meaning is different. E.g, 0xFF, it both stood for as "FF". When it is treated as "char", the is an unfavorable number -1; but it is 255 together unsigned. When it concerns bit shifting, the is a large difference since the sign little is no shifted. E.g, if you change 255 best 1 bit, it will acquire 127; shifting "-1" right will it is in no effect.

A signed char is a signed worth which is frequently smaller than, and also is guaranteed not to be bigger than, a short. An unsigned char is an unsigned worth which is typically smaller than, and is guaranteed not to be bigger than, a short. A type char there is no a signed or unsigned qualifier might behave as either a signed or unsigned char; this is typically implementation-defined, however there room a pair of instances where the is not:

If, in the target platform"s character set, any of the characters required by conventional C would certainly map come a code greater than the best `signed char`, then `char` need to be unsigned.If `char` and `short` are the same size, then `char` need to be signed.

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Part of the reason there are two dialects of "C" (those wherein char is signed, and also those where it is unsigned) is that there space some implementations wherein char should be unsigned, and also others whereby it should be signed.