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How to Get User Input in C ? (cin Tutorial)
The most common way to obtain user input in C is std::cin, which needs to include the header file; use >> to read formatted input, and getline to read the entire line. Note that when mixed use, call ignore to clean the buffer, and implement input verification through fail/clear/ignore.
Dec 31, 2025 am 04:29 AM
How to create a header-only library in C ? (Best Practices)
Header-onlyC librariesplaceallcodein.h/.hppfiles,requiringinlinefunctions,templates,andconstexprentitiestoavoidODRviolations;useincludeguards,minimizedependencies,prefertemplates,andtestacrosscompilers.
Dec 31, 2025 am 02:10 AM
How to use C coroutines for building a scalable TCP server
Use C20 coroutines combined with Boost.Asio to build an efficient and scalable TCP server. 1. Choose an asynchronous I/O framework that supports coroutines, such as Boost.Asio, which provides co_await-compatible awaitable types; 2. Write a coroutine-based connection processor, use co_await to suspend I/O operations without blocking threads, and simplify asynchronous logic; 3. Use coroutine loops to asynchronously accept connections, and start session tasks through co_spawn to achieve concurrency; 4. Run coroutines on the io_context event loop, supporting multi-threaded operation to fully utilize the CPU core. Compared with traditional thread or callback models, coroutines reduce memory overhead and improve code readability, and work with non-blocking I
Dec 31, 2025 am 01:55 AM
How to integrate Google Test (gtest) for unit testing in C
Using CMake's FetchContent to integrate GoogleTest is the recommended method. First, declare the googletest dependency in CMakeLists.txt and enable testing, then write a test file containing the TEST macro, and finally build it through cmake and run it with ctest; this method automatically downloads dependencies to ensure cross-platform consistency and does not require system-level installation.
Dec 31, 2025 am 01:47 AM
How to use std::variant in C 17? (Type-Safe Union Tutorial)
std::variant is a type-safe union introduced in C 17. It only holds one value of a specified type at the same time; it supports direct initialization, runtime type checking (holds_alternative), safe access (get_if) and generic access (visit). Implicit conversion is prohibited and recursive definitions need to be avoided.
Dec 31, 2025 am 01:11 AM
How to use std::deque (double-ended queue) in C ? (STL Guide)
std::deque is a sequence container in STL that supports efficient insertion and deletion at both ends. It is implemented using block dynamic arrays and provides O(1) amortized complexity of head and tail operations and random access. The declaration must be included and supports initialization list and iterator traversal, but the memory is not continuous and there is no capacity() interface.
Dec 31, 2025 am 12:55 AM
How to optimize C code for better performance and low latency
Usecompileroptimizationslike-O2,-O3,-march=nativeforperformancegains.2.Writecache-friendlycodewithsequentialaccessandproperdatalayout.3.Reducedynamicallocationsviastackuse,pools,andpre-sizing.4.LeveragemovesemanticsandRVOtoavoidcopies.5.Avoidvirtualf
Dec 31, 2025 am 12:34 AM
How to Implement Function Overloading in C ? (Code Sample)
Function overloading allows functions with the same name but different parameter lists to be defined in the same scope. The compiler statically selects the best match at compile time based on the actual parameters; the return type does not participate in overload resolution, and ambiguity caused by implicit conversion needs to be avoided.
Dec 31, 2025 am 12:28 AM
How to Use References in C ? (Code Example)
C reference is an alias of a variable, which must be initialized when declared and cannot be rebinded; used as a function parameter to avoid copying and support modification of the original object. Returning a reference must ensure the safety of the life cycle of the referenced object; it is safer and more concise than a pointer, but has no null value and rebinding capabilities.
Dec 31, 2025 am 12:22 AM
How to convert a C-style char* to std::string in C ? (And Vice Versa)
C-stylechar can be safely converted to std::string, but when converting std::string to constchar, you need to pay attention to the life cycle: use c_str() or data() to obtain a read-only pointer. The validity period is limited to the existence of the string object and has not been modified; be careful when obtaining a writable char*. It is recommended to use vector or resize to obtain the address, and disable const_cast.
Dec 31, 2025 am 12:08 AM
How to read command-line arguments in C ? (argc, argv tutorial)
The main function in C receives command line parameters through argc and argv: argc is the number of parameters (at least 1, including the program name), argv is an array of pointers pointing to each parameter string, argv[argc] is a null pointer, and argc must be checked before accessing to prevent out-of-bounds.
Dec 30, 2025 am 04:04 AM
How to get the length of a string in C ? (.length() vs .size())
In C, std::string's .length() and .size() functions are exactly the same, both return the number of characters (size_t type); .length() focuses on text semantics, and .size() conforms to the STL container unified interface; both accurately count empty strings, strings containing spaces and '\0'.
Dec 30, 2025 am 03:32 AM
How to Get the Current Time in C ? (chrono Library Tutorial)
It is recommended to use the std::chrono library of C 11 to obtain the current time: first use std::chrono::system_clock::now() to obtain the time_point, then convert it to time_t and format the output with ctime or strftime.
Dec 30, 2025 am 03:23 AM
How to convert a char to an int in C ? (Casting Guide)
Convert char to int in C. If you need an ASCII/Unicode value, you can assign it directly (such as 'A'→65); if it is a numeric character ('0'–'9') and needs to correspond to a numerical value, use c-'0' (such as '7'→7), and it is recommended to verify the range first.
Dec 30, 2025 am 02:38 AM
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