How to input 3 numbers in C language and output them from small to large

The return value types of C language function include int, float, double, char, void and pointer types. int is used to return integers, float and double are used to return floats, and char returns characters. void means that the function does not return any value. The pointer type returns the memory address, be careful to avoid memory leakage.结构体或联合体可返回多个相关数据。

C language functions are reusable code blocks. They receive input, perform operations, and return results, which modularly improves reusability and reduces complexity. The internal mechanism of the function includes parameter passing, function execution, and return values. The entire process involves optimization such as function inline. A good function is written following the principle of single responsibility, small number of parameters, naming specifications, and error handling. Pointers combined with functions can achieve more powerful functions, such as modifying external variable values. Function pointers pass functions as parameters or store addresses, and are used to implement dynamic calls to functions. Understanding function features and techniques is the key to writing efficient, maintainable, and easy to understand C programs.

C language functions are the basis for code modularization and program building. They consist of declarations (function headers) and definitions (function bodies). C language uses values ​​to pass parameters by default, but external variables can also be modified using address pass. Functions can have or have no return value, and the return value type must be consistent with the declaration. Function naming should be clear and easy to understand, using camel or underscore nomenclature. Follow the single responsibility principle and keep the function simplicity to improve maintainability and readability.

Methods to efficiently and elegantly find the greatest common divisor in C language: use phase division to solve by constantly dividing the remainder until the remainder is 0. Two implementation methods are provided: recursion and iteration are concise and clear, and the iterative implementation is higher and more stable. Pay attention to handling negative numbers and 0s, and consider performance optimization, but the phase division itself is efficient enough.

C language functions are reusable code blocks, receive parameters for processing, and return results. It is similar to the Swiss Army Knife, powerful and requires careful use. Functions include elements such as defining formats, parameters, return values, and function bodies. Advanced usage includes function pointers, recursive functions, and callback functions. Common errors are type mismatch and forgetting to declare prototypes. Debugging skills include printing variables and using a debugger. Performance optimization uses inline functions. Function design should follow the principle of single responsibility. Proficiency in C language functions can significantly improve programming efficiency and code quality.

The pointer parameters of C language function directly operate the memory area passed by the caller, including pointers to integers, strings, or structures. When using pointer parameters, you need to be careful to modify the memory pointed to by the pointer to avoid errors or memory problems. For double pointers to strings, modifying the pointer itself will lead to pointing to new strings, and memory management needs to be paid attention to. When handling pointer parameters to structures or arrays, you need to carefully check the pointer type and boundaries to avoid out-of-bounds access.

C language functions have two basic requirements: declaration and definition. The declaration tells the compiler the function name, parameter type and return value type; the definition contains the specific implementation of the function. The parameter transfer method determines the way the function processes data (value transfer or pointer transfer), and the return value determines the execution result of the function. Common errors include forgetting declarations, parameter type mismatch, and memory leaks. Performance optimization techniques include inline functions, and best practices recommend modular design.

The key elements of C function definition include: return type (defining the value returned by the function), function name (following the naming specification and determining the scope), parameter list (defining the parameter type, quantity and order accepted by the function) and function body (implementing the logic of the function). It is crucial to clarify the meaning and subtle relationship of these elements, and can help developers avoid "pits" and write more efficient and elegant code.