0x240000000U

0x240000000U is a hexadecimal integer literal used in the C family of languages to represent an unsigned value. The 0x prefix indicates hexadecimal notation, and the trailing U suffix designates an unsigned type for the literal.

The value of 0x240000000 in decimal is 9,663,676,416. This is larger than the maximum value of a 32-bit unsigned int (4,294,967,295), so on most implementations it does not fit in unsigned int. As a result, the compiler selects the smallest unsigned type that can represent it from the set {unsigned int, unsigned long, unsigned long long}. On systems where unsigned long is 64 bits, the type would be unsigned long. On systems where unsigned long is 32 bits (common 32-bit and LLP64 models), the type would be unsigned long long.

Because the exact type depends on platform, code that uses 0x240000000U may have different signedness or width across environments. If a programmer requires a guaranteed 64-bit type regardless of platform, a common approach is to append of the appropriate suffix, such as 0x240000000ULL, or to use a fixed-width type like std::uint64_t with an explicit literal (for example, 0x240000000ULL in C/C++11 and later).

In practice, 0x240000000U can appear in contexts such as large constants, bit masks, or address-like values in 64-bit computations. See also integer literals, unsigned integer types, and 0x notation for related concepts.

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