Home Java javaTutorial Use switch statements to select different situations

Use switch statements to select different situations

Feb 20, 2024 am 10:38 AM
switch usage case

Use switch statements to select different situations

switch and case are commonly used structures in programming, used to execute different code blocks based on different conditions. This article will introduce the usage of switch and case in detail and provide specific code examples.

The switch statement is a multi-branch selection structure that accepts an expression as a parameter and selects the corresponding code block for execution based on the value of the expression. The switch statement is usually used in conjunction with the case statement, which is used to define specific branches and corresponding execution codes. When the value of the expression is equal to the value of a case, the code block under the case will be executed.

The syntax structure of the switch statement is as follows:

switch(表达式) {
  case 值1:
    // 执行代码块1
    break;
  case 值2:
    // 执行代码块2
    break;
  ...
  default:
    // 执行默认代码块
    break;
}
Copy after login

In the above code, the expression is a variable or expression, which is used to determine which case code block is specifically executed. Each case is followed by a colon (:), indicating the code block under that case. The break statement is used to jump out of the switch statement to avoid continuing to execute other cases. The default keyword is used to specify the default code block to be executed when no case is matched.

The following is a practical example showing how to use switch and case:

#include <iostream>
using namespace std;

int main() {
  int num = 2;
  switch(num) {
    case 1:
      cout << "数字是1" << endl;
      break;
    case 2:
      cout << "数字是2" << endl;
      break;
    case 3:
      cout << "数字是3" << endl;
      break;
    default:
      cout << "数字不是1、2、3" << endl;
      break;
  }
  return 0;
}
Copy after login

In the above code, we define an integer variable num and assign it a value of 2. According to the value of num, the switch statement will execute the code block under the corresponding case. Since the value of num is 2, the code block under the second case will be executed and "the number is 2" will be output.

In addition to integer variables, the switch statement can also be used to determine other types of variables, such as character types, enumeration types, etc.

It should be noted that each case in the switch statement must be followed by a break statement to terminate the case, otherwise the code of the next case will continue to be executed. If the code block of a certain case does not need to be terminated, it can be replaced with an empty statement or using a special comment.

The above is an introduction to the usage of switch and case and specific code examples. By using switches and cases flexibly, we can write clearer and more readable code. I hope this article can be helpful to your study!

The above is the detailed content of Use switch statements to select different situations. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Analyze the usage and classification of JSP comments Analyze the usage and classification of JSP comments Feb 01, 2024 am 08:01 AM

Classification and Usage Analysis of JSP Comments JSP comments are divided into two types: single-line comments: ending with, only a single line of code can be commented. Multi-line comments: starting with /* and ending with */, you can comment multiple lines of code. Single-line comment example Multi-line comment example/**This is a multi-line comment*Can comment on multiple lines of code*/Usage of JSP comments JSP comments can be used to comment JSP code to make it easier to read

Can Elden's Ring be played on switch? Can Elden's Ring be played on switch? Mar 11, 2024 am 11:31 AM

Can Elden's Ring be played on the switch? As a very charming action RPG game, many friends may not know whether it can be played smoothly on the switch platform. The answer is that it cannot be played at the moment. accomplish. Can Ring of Elden be played on switch? Answer: It cannot be played on switch. This highly anticipated Souls series role-playing action game has been officially released. Players can purchase it on PC, PS4/5 and Xbox Series eX|S/XboxOne and experience it immediately. Many friends who own a switch may still be eager to enjoy this game on the NS, but unfortunately, there is no switch version of the game. According to the official website configuration requirements, the game configuration is relatively high, and sw

How to correctly use the exit function in C language How to correctly use the exit function in C language Feb 18, 2024 pm 03:40 PM

How to use the exit function in C language requires specific code examples. In C language, we often need to terminate the execution of the program early in the program, or exit the program under certain conditions. C language provides the exit() function to implement this function. This article will introduce the usage of exit() function and provide corresponding code examples. The exit() function is a standard library function in C language and is included in the header file. Its function is to terminate the execution of the program, and can take an integer

Usage of WPSdatedif function Usage of WPSdatedif function Feb 20, 2024 pm 10:27 PM

WPS is a commonly used office software suite, and the WPS table function is widely used for data processing and calculations. In the WPS table, there is a very useful function, the DATEDIF function, which is used to calculate the time difference between two dates. The DATEDIF function is the abbreviation of the English word DateDifference. Its syntax is as follows: DATEDIF(start_date,end_date,unit) where start_date represents the starting date.

Detailed explanation and usage introduction of MySQL ISNULL function Detailed explanation and usage introduction of MySQL ISNULL function Mar 01, 2024 pm 05:24 PM

The ISNULL() function in MySQL is a function used to determine whether a specified expression or column is NULL. It returns a Boolean value, 1 if the expression is NULL, 0 otherwise. The ISNULL() function can be used in the SELECT statement or for conditional judgment in the WHERE clause. 1. The basic syntax of the ISNULL() function: ISNULL(expression) where expression is the expression to determine whether it is NULL or

How to use Apple shortcuts How to use Apple shortcuts Feb 18, 2024 pm 05:22 PM

How to use Apple shortcut commands With the continuous development of technology, mobile phones have become an indispensable part of people's lives. Among many mobile phone brands, Apple mobile phones have always been loved by users for their stable systems and powerful functions. Among them, the Apple shortcut command function makes users’ mobile phone experience more convenient and efficient. Apple Shortcuts is a feature launched by Apple for iOS12 and later versions. It helps users simplify their mobile phone operations by creating and executing custom commands to achieve more efficient work and

Using the distinct keyword in parsing SQL Using the distinct keyword in parsing SQL Feb 18, 2024 pm 09:21 PM

Detailed explanation of distinct usage in SQL In SQL databases, we often encounter situations where we need to remove duplicate data. At this time, we can use the distinct keyword, which can help us remove duplicate data and make the query results clearer and more accurate. The basic usage of distinct is very simple, just use the distinct keyword in the select statement. For example, the following is a normal select statement: SELECTcolumn_name

Is Switch2 compatible with Switch cartridges? Is Switch2 compatible with Switch cartridges? Jan 28, 2024 am 09:06 AM

Switch2 is a new model announced by Nintendo at Gamescom 2023. Some players are worried about whether there will be compatibility issues between the new model and the cartridges of previous versions. Let’s take a look. Is switch2 compatible with switch cassette? Answer: switch2 is not compatible with switch cassette. Introduction of Switch 2 cartridges According to information from Nintendo’s production chain company, Switch 2 may use 64GB cartridges. Because it has better performance and supports more 3A game masterpieces, it requires a larger cartridge capacity. Because many game works need to be castrated and compressed before they can be stuffed into a game cartridge. Moreover, Switch cartridges are prone to copying game content, so replace them with new cartridges.

See all articles