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By POSIX, intmax_t designates a signed integer type capable of representing any value of any signed integer type.
Would it be correct that in C99/C11 that intmax_t is always the same size as long long int?
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The intmax_t is the longest integer type in C – it's the same as the long or the long long type. The absolute value of a number ( n ) is the non-negative value of n . In mathematics, we denote the absolute value as below: The absolute value of both n and -n is n.
No, but you can use libraries like GMP to handle bigger numbers.
The int data type is a 32-bit signed two's complement integer. The long data type is a 64-bit signed two's complement integer. The long is a larger data type than int. The difference between int and long is that int is 32 bits in width while long is 64 bits in width.
No. intmax_t can be an extended integer type larger than long long. I'm not aware of any systems that have it defined as such, but you should not assume in application code that they're the same. (Assuming they're the same in OS code may be acceptable if your OS always guarantees that, but it's still probably a bad idea.)
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C99 N1256 standard draft
6.2.5 Types tells us about "extended signed integer types":
4 There are five standard signed integer types, designated as signed char, short int, int, long int, and long long int. (These and other types may be designated in several additional ways, as described in 6.7.2.) There may also be implementation-defined extended signed integer types The standard and extended signed integer types are collectively called signed integer types. 29)
29) Therefore, any statement in this Standard about signed integer types also applies to the extended signed integer types.
7.18.1.5 Greatest-width integer types says that intmax_t is the largest possible "signed integer type", thus including extended ones:
1 The following type designates a signed integer type capable of representing any value of any signed integer type:
intmax_t
6.4.4.1 Integer constants then makes it pretty clear that the extended integer types might be larger than any of the standard ones:
6 If an integer constant cannot be represented by any type in its list, it may have an extended integer type, if the extended integer type can represent its value.
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If long and long long have the same width and representation, which they often do, long could be chosen for intmax_t.
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