What is the precedence of logical operators in C language?
The precedence of logical operators in C language from high to low is:! (logical NOT), && (logical AND), || (logical OR). The value of a logical expression is a logical value; logical values are divided into logical true values and logical false values. During judgment, only zero values are judged as logical false values (false), and all non-zero values can be judged as logical true values. value(true).
#C language provides the following three logical operators.
One yuan:! (logical not). Binary: && (logical AND), || (logical OR).
Among the above three logical operators, logical NOT ! has the highest priority, logical AND && comes second, and logical OR || has the lowest priority.
The value of a logical expression is a logical value, that is, Boolean type (bool). This type is new in C99. Some compilers may not support this type yet.
Logical values are divided into logical true values and logical false values. Under normal circumstances, during judgment, only zero values are judged as logical false values (false), and all non-zero values can be judged as logical true values (true); when storing and representing, usually, 1 is used to represent logical values. True value, 0 represents a logical false value.
The operation rules of logical AND && operator: The result is true only when both operands are logically true. In all other cases, the result is false.
The operation rules of logical OR || operator: The result is false only when both operands are logically false. In all other cases, the result is true.
int a=3,b=5;
Then there are:
!a: Since a is non-zero, it is true, !a is false, and its value is 0.
a||b: Since both a and b are non-zero and both are true, the result of logical OR is true and its value is 1.
a&&b: Since both a and b are non-zero and both are true, the result of logical AND is true and its value is 1.
!a||b&&2: Since logical negation! has the highest priority, it is combined with a first, and && has a higher priority than ||, which is equivalent to (!a)||(b&&2), that is, 0|| 1 is true, its value is 1.
Logical AND &&, logical OR || all have "short circuit" characteristics:
Logical AND && "short circuit": When the left operand of logical AND && is logical When false, it is enough to judge that the result of the logical operation is false, so the right operand will no longer be executed.
Logical OR || "Short circuit": When the left operand of logical OR || is logically true, it is enough to judge that the result of the logical operation is true, so the right operand will no longer be executed.
Recommended tutorial: "C Language"
The above is the detailed content of What is the precedence of logical operators in C language?. For more information, please follow other related articles on the PHP Chinese website!
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1386
52
C language data structure: data representation and operation of trees and graphs
Apr 04, 2025 am 11:18 AM
C language data structure: The data representation of the tree and graph is a hierarchical data structure consisting of nodes. Each node contains a data element and a pointer to its child nodes. The binary tree is a special type of tree. Each node has at most two child nodes. The data represents structTreeNode{intdata;structTreeNode*left;structTreeNode*right;}; Operation creates a tree traversal tree (predecision, in-order, and later order) search tree insertion node deletes node graph is a collection of data structures, where elements are vertices, and they can be connected together through edges with right or unrighted data representing neighbors.
The truth behind the C language file operation problem
Apr 04, 2025 am 11:24 AM
The truth about file operation problems: file opening failed: insufficient permissions, wrong paths, and file occupied. Data writing failed: the buffer is full, the file is not writable, and the disk space is insufficient. Other FAQs: slow file traversal, incorrect text file encoding, and binary file reading errors.
C language multithreaded programming: a beginner's guide and troubleshooting
Apr 04, 2025 am 10:15 AM
C language multithreading programming guide: Creating threads: Use the pthread_create() function to specify thread ID, properties, and thread functions. Thread synchronization: Prevent data competition through mutexes, semaphores, and conditional variables. Practical case: Use multi-threading to calculate the Fibonacci number, assign tasks to multiple threads and synchronize the results. Troubleshooting: Solve problems such as program crashes, thread stop responses, and performance bottlenecks.
How to output a countdown in C language
Apr 04, 2025 am 08:54 AM
How to output a countdown in C? Answer: Use loop statements. Steps: 1. Define the variable n and store the countdown number to output; 2. Use the while loop to continuously print n until n is less than 1; 3. In the loop body, print out the value of n; 4. At the end of the loop, subtract n by 1 to output the next smaller reciprocal.
CS-Week 3
Apr 04, 2025 am 06:06 AM
Algorithms are the set of instructions to solve problems, and their execution speed and memory usage vary. In programming, many algorithms are based on data search and sorting. This article will introduce several data retrieval and sorting algorithms. Linear search assumes that there is an array [20,500,10,5,100,1,50] and needs to find the number 50. The linear search algorithm checks each element in the array one by one until the target value is found or the complete array is traversed. The algorithm flowchart is as follows: The pseudo-code for linear search is as follows: Check each element: If the target value is found: Return true Return false C language implementation: #include#includeintmain(void){i
C language data structure: the key role of data structures in artificial intelligence
Apr 04, 2025 am 10:45 AM
C Language Data Structure: Overview of the Key Role of Data Structure in Artificial Intelligence In the field of artificial intelligence, data structures are crucial to processing large amounts of data. Data structures provide an effective way to organize and manage data, optimize algorithms and improve program efficiency. Common data structures Commonly used data structures in C language include: arrays: a set of consecutively stored data items with the same type. Structure: A data type that organizes different types of data together and gives them a name. Linked List: A linear data structure in which data items are connected together by pointers. Stack: Data structure that follows the last-in first-out (LIFO) principle. Queue: Data structure that follows the first-in first-out (FIFO) principle. Practical case: Adjacent table in graph theory is artificial intelligence
Troubleshooting tips for processing files in C language
Apr 04, 2025 am 11:15 AM
Troubleshooting Tips for C language processing files When processing files in C language, you may encounter various problems. The following are common problems and corresponding solutions: Problem 1: Cannot open the file code: FILE*fp=fopen("myfile.txt","r");if(fp==NULL){//File opening failed} Reason: File path error File does not exist without file read permission Solution: Check the file path to ensure that the file has check file permission problem 2: File reading failed code: charbuffer[100];size_tread_bytes=fread(buffer,1,siz
The concept of c language functions and their definition format
Apr 03, 2025 pm 11:33 PM
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.
