Well, even in Java 8, long and int are still signed, only some methods treat them as if they were unsigned. If you want to write unsigned long literal like that, you can do static long values = Long.parseUnsignedLong(“18446744073709551615”); public static void main(String[] args) { System.out.println(values); // -1 System.out.println(Long.toUnsignedString(values)); // 18446744073709551615 }
When comparing signed with unsigned, the compiler converts the signed value to unsigned. For equality, this doesn’t matter, -1 == (unsigned) -1. For other comparisons it matters, e.g. the following is true: -1 > 2U. EDIT: References: 5/9: (Expressions) Many binary operators that expect operands of arithmetic or enumeration type cause conversions and yield result … Read more
From the link above: Several of these types can be modified using the keywords signed, unsigned, short, and long. When one of these type modifiers is used by itself, a data type of int is assumed This means that you can assume the author is using ints.
unsigned really is a shorthand for unsigned int, and so defined in standard C.
Assuming: You have 2’s-complement representations in mind; and, By (unsigned long) you mean unsigned 32-bit integer, then you just need to add 2**32 (or 1 << 32) to the negative value. For example, apply this to -1: >>> -1 -1 >>> _ + 2**32 4294967295L >>> bin(_) ‘0b11111111111111111111111111111111’ Assumption #1 means you want -1 to … Read more
ssize_t is used for functions whose return value could either be a valid size, or a negative value to indicate an error. It is guaranteed to be able to store values at least in the range [-1, SSIZE_MAX] (SSIZE_MAX is system-dependent). So you should use size_t whenever you mean to return a size in bytes, … Read more
The rationale is described in this paper. A quote: When span was adopted into C++17, it used a signed integer both as an index and a size. Partly this was to allow for the use of “-1” as a sentinel value to indicate a type whose size was not known at compile time. But having … Read more
Starting Java 8, there is support for unsigned long (unsigned 64 bits). The way you can use it is: Long l1 = Long.parseUnsignedLong(“17916881237904312345”); To print it, you can not simply print l1, but you have to first: String l1Str = Long.toUnsignedString(l1) Then System.out.println(l1Str);
When you work with unsigned types, modular arithmetic (also known as “wrap around” behavior) is taking place. To understand this modular arithmetic, just have a look at these clocks: 9 + 4 = 1 (13 mod 12), so to the other direction it is: 1 – 4 = 9 (-3 mod 12). The same principle … Read more
if it is use to represent non negative value so why we not using unsigned int instead of size_t Because unsigned int is not the only unsigned integer type. size_t could be any of unsigned char, unsigned short, unsigned int, unsigned long or unsigned long long, depending on the implementation. Second question is that size_t … Read more