ULL Suffix on Numeric Literals
In C programming, encountering code like line = addr & 0x3fULL can raise questions about the purpose of the ULL suffix appended to the hex number. Understanding this suffix requires exploring the concept of data types in numeric literals.
The ULL suffix signifies that the specified numeric literal represents an unsigned long long integer. According to the GCC manual, appending LL to an integer constant denotes a long long integer, while ULL denotes an unsigned long long integer.
This suffix modifier allows programmers to explicitly define the data type of the literal, ensuring correct calculations and data handling. For example, in the given code snippet, 0x3fULL specifies an unsigned long long int with the value 63 (0x3f in hexadecimal).
It's important to note that these suffixes became part of the C99 standard for ISO C. However, they were also supported as compiler extensions in earlier versions of C . With the introduction of C 11, ULL and LL were officially added to the C language specification.
The above is the detailed content of What does the ULL suffix mean in a numeric literal in C programming?. For more information, please follow other related articles on the PHP Chinese website!

This article explains the C Standard Template Library (STL), focusing on its core components: containers, iterators, algorithms, and functors. It details how these interact to enable generic programming, improving code efficiency and readability t

This article details efficient STL algorithm usage in C . It emphasizes data structure choice (vectors vs. lists), algorithm complexity analysis (e.g., std::sort vs. std::partial_sort), iterator usage, and parallel execution. Common pitfalls like

This article details effective exception handling in C , covering try, catch, and throw mechanics. It emphasizes best practices like RAII, avoiding unnecessary catch blocks, and logging exceptions for robust code. The article also addresses perf

The article discusses using move semantics in C to enhance performance by avoiding unnecessary copying. It covers implementing move constructors and assignment operators, using std::move, and identifies key scenarios and pitfalls for effective appl

C 20 ranges enhance data manipulation with expressiveness, composability, and efficiency. They simplify complex transformations and integrate into existing codebases for better performance and maintainability.

The article discusses dynamic dispatch in C , its performance costs, and optimization strategies. It highlights scenarios where dynamic dispatch impacts performance and compares it with static dispatch, emphasizing trade-offs between performance and

Article discusses effective use of rvalue references in C for move semantics, perfect forwarding, and resource management, highlighting best practices and performance improvements.(159 characters)

C memory management uses new, delete, and smart pointers. The article discusses manual vs. automated management and how smart pointers prevent memory leaks.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Dreamweaver Mac version
Visual web development tools