是否将“ unsigned int”视为数据类型？

Question

If I have:

unsigned int i;

Is unsigned int considered to be a data type by itself just like an int or a float is a data type? or we just say that int is the data type while the unsigned is just modifying the way the data type works?

Answer 1

C++ standard §3.9.1, paragraphs 2-3: (C is similar)

2. There are five standard signed integer types : “signed char”, “short int”, “int”, “long int”, and “long long int”…
3. For each of the standard signed integer types, there exists a corresponding (but different) standard unsigned integer type: “unsigned char”, “unsigned short int”, “unsigned int”, “unsigned long int”, and “unsigned long long int”…

Answer 2

Yes. From C11 6.2.5 Types, paragraph 6:

For each of the signed integer types, there is a corresponding (but different) unsigned integer type (designated with the keyword unsigned) that uses the same amount of storage (including sign information) and has the same alignment requirements. The type _Bool and the unsigned integer types that correspond to the standard signed integer types are the standard unsigned integer types. The unsigned integer types that correspond to the extended signed integer types are the extended unsigned integer types. The standard and extended unsigned integer types are collectively called unsigned integer types.