Essential C
### Essential C:Stanford CS Education Library Summary #### Introduction "Essential C," authored by Nick Parlante and published as part of the Stanford CS Education Library, offers a concise yet comprehensive overview of the C programming language. This document is particularly valuable for individuals with some prior programming experience looking to understand or refresh their knowledge of C. The guide covers a wide range of topics, including basic data types, operators, control structures, complex data types, functions, and advanced concepts such as pointers and heap memory management. #### Basic Types and Operators In this section, "Essential C" delves into the fundamental data types and operators in C. It explains the various integer types, such as `int`, `short`, and `long`, along with floating-point types like `float` and `double`. The document highlights the importance of understanding type promotion and truncation, which occur when performing operations between different data types. For instance, an operation involving an `int` and a `double` will result in a `double` due to promotion rules. The section also covers assignment, comparison, and arithmetic operators. These include the basic mathematical operations (`+`, `-`, `*`, `/`), as well as compound assignment operators like `+=` and `-=`. Understanding these operators is crucial for manipulating values and performing calculations in C programs. #### Control Structures Control structures are essential for managing program flow. "Essential C" outlines several control structures, including: - **If Statement**: Used for conditional execution based on a boolean expression. - **Conditional Operator** (`?:`): A ternary operator that can be used as a shorthand for simple if-else statements. - **Switch Statement**: Allows for multiple conditions to be checked against a single variable. - **While Loop**: Executes a block of code repeatedly while a condition is true. - **For Loop**: Similar to a while loop but with a more compact syntax for initializing, testing, and updating the loop variable. - **Do-While Loop**: Guarantees that the loop body will execute at least once before checking the condition. - **Break and Continue Statements**: Control the flow within loops. These constructs enable programmers to create complex logic and control the execution sequence of their programs effectively. #### Complex Data Types The document also explores more advanced data types and constructs: - **Structs**: User-defined composite data types that allow grouping related data items. - **Arrays**: Fixed-size collections of elements of the same type. - **Pointers**: Variables that store memory addresses, enabling dynamic memory allocation and manipulation. - **Strings**: Special cases of character arrays used for text representation. Understanding how to use structs, arrays, and pointers is critical for creating efficient and scalable programs. The guide also covers the `typedef` keyword, which simplifies complex data types by assigning them more readable names. #### Functions Functions are central to modular programming in C. "Essential C" discusses the following aspects: - **Function Declaration and Definition**: How to define and call functions. - **Void Functions**: Functions that do not return a value. - **Value Parameters**: Passing arguments by value, where a copy of the argument is made. - **Reference Parameters**: Passing arguments by reference, allowing functions to modify the original variable directly. - **Const Qualifier**: Specifying that a parameter should not be modified within the function. Functions are essential for breaking down large programs into smaller, manageable pieces and for reusing code. #### Odds and Ends This section includes miscellaneous topics that are important for C programming: - **Main Function**: The entry point of every C program. - **Header and Source Files**: The `.h` and `.c` files convention for organizing code and declarations. - **Preprocessor**: A tool that processes source code before actual compilation, handling macros and includes. - **Assert Function**: A debugging tool for ensuring that certain conditions are met during runtime. #### Advanced Arrays and Pointers "Essential C" also delves into more advanced topics: - **Array and Pointer Interaction**: Explaining how arrays and pointers are related and how they interact. - **Base Address and Offset Arithmetic**: Techniques for accessing array elements using pointers. - **Heap Memory Management**: Allocating and deallocating memory dynamically using functions like `malloc` and `free`. - **Heap Arrays**: Creating arrays on the heap rather than the stack for more flexible memory usage. Understanding these concepts is vital for optimizing performance and managing resources efficiently. #### Operators and Standard Library Reference Finally, the document provides a reference guide covering common operators and standard library functions. This section serves as a handy resource for quick lookups and reminders. In conclusion, "Essential C" by Nick Parlante is a valuable resource for anyone interested in learning or revisiting the fundamentals of the C programming language. Its comprehensive coverage of key topics makes it suitable for both beginners and experienced programmers seeking to deepen their understanding of C.
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- ToConnection2013-07-18不错,谢谢,英文版的
- rgqclzz2014-08-17版面不是很好,不过貌似网上也找不到别样的了,好像都是这一版……
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