A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each switch case. The syntax for a switch statement in C programming language is as follows −. Switch case in C. Switch case statements are a substitute for long if statements that compare a variable to several 'integral' values ('integral' values are simply values that can be expressed as an integer, such as the value of a char). The basic format for using switch case is outlined below. The enumeration defines the numeric values use in the switch statement. The std::map contains the link between the valid string values you want to compare some runtime data against, and the numeric enum values you can make a switch on. The string is the key of the map, the enumerator the value. Jun 03, 2015 Write a C program to input week number(1-7) and print day of week name using switch case. C program to find week day name using switch case in C program. Learn C programming, Data Structures tutorials, exercises, examples, programs, hacks, tips and tricks online.
The switch statement in C is a control statement that is useful in a limited number of cases. The switch statement resembles a compound if statement by including a number of different possibilities rather than a single test. Jun 03, 2015 Write a C program to input an alphabet and check vowel or consonant using switch case. Logic to check vowel or consonant using switch case in C programming. Auto tune recorder online. Learn C programming, Data Structures tutorials, exercises, examples, programs, hacks, tips and tricks online.
C/C++ support for Visual Studio Code is provided by a Microsoft C/C++ extension to enable cross-platform C and C++ development on Windows, Linux, and macOS.
Getting started
C/C++ compiler and debugger
The C/C++ extension does not include a C++ compiler or debugger. You will need to install these tools or use those already installed on your computer.
Popular C++ compilers are:
- GCC on Linux
- GCC via Mingw-w64 on Windows
- Microsoft C++ compiler on Windows
- Clang for XCode on macOS
Make sure your compiler executable is in your platform path so the extension can find it. You can check availability of your C++ tools by opening the Integrated Terminal (⌃` (Windows, Linux Ctrl+`)) in VS Code and try running the executable (for example g++ --help).
Install the Microsoft C/C++ extension
- Open VS Code.
- Click the Extensions view icon on the Sidebar (⇧⌘X (Windows, Linux Ctrl+Shift+X)).
- Search for
c++. - Click Install.
Hello World tutorials
Get started with C++ and VS Code with Hello World tutorials for your environment:
Documentation
You can find more documentation on using the Microsoft C/C++ extension under the C++ section, where you'll find topics on:
Remote Development
VS Code and the C++ extension support Remote Development allowing you to work over SSH on a remote machine or VM, inside a Docker container, or in the Windows Subsystem for Linux (WSL).
To install support for Remote Development:
- Install the VS Code Remote Development Extension Pack.
- If the remote source files are hosted in WSL, use the Remote - WSL extension.
- If you are connecting to a remote machine with SSH, use the Remote - SSH extension.
- If the remote source files are hosted in a container (for example, Docker), use the Remote - Containers extension.
Feedback
If you run into any issues or have suggestions for the Microsoft C/C++ extension, please file issues and suggestions on GitHub. If you haven't already provided feedback, please take this quick survey to help shape this extension for your needs.
| Language | ||||
| Standard Library Headers | ||||
| Freestanding and hosted implementations | ||||
| Named requirements | ||||
| Language support library | ||||
| Concepts library(C++20) | ||||
| Diagnostics library | ||||
| Utilities library | ||||
| Strings library | ||||
| Containers library | ||||
| Iterators library | ||||
| Ranges library(C++20) | ||||
| Algorithms library | ||||
| Numerics library | ||||
| Input/output library | ||||
| Localizations library | ||||
| Regular expressions library(C++11) | ||||
| Atomic operations library(C++11) | ||||
| Thread support library(C++11) | ||||
| Filesystem library(C++17) | ||||
| Technical Specifications |
| Labels | ||||
| label : statement | ||||
| Expression statements | ||||
| expression ; | ||||
| Compound statements | ||||
| { statement.. } | ||||
| Selection statements | ||||
| if | ||||
| switch | ||||
| Iteration statements | ||||
| while | ||||
| do-while | ||||
| for | ||||
| range for(C++11) | ||||
| Jump statements | ||||
| break | ||||
| continue | ||||
| return | ||||
| goto | ||||
| Declaration statements | ||||
| declaration ; | ||||
| Try blocks | ||||
| try compound-statementhandler-sequence | ||||
| Transactional memory | ||||
synchronized, atomic_commit, etc(TM TS) |
Transfers control to one of the several statements, depending on the value of a condition.
[edit]Syntax
attr(optional)switch(condition)statement | (until C++17) |
attr(optional)switch(init-statement(optional)condition)statement | (since C++17) |
| attr(C++11) | - | any number of attributes |
| condition | - | any expression of integral or enumeration type, or of a class type contextually implicitly convertible to an integral or enumeration type, or a declaration of a single non-array variable of such type with a brace-or-equals initializer. |
| init-statement(C++17) | - | either
|
| statement | - | any statement (typically a compound statement). case: and default: labels are permitted in statement and break; statement has special meaning. |
attr(optional)caseconstant_expression:statement | (1) |
attr(optional)default:statement | (2) |
| constant_expression | - | a constant expression of the same type as the type of condition after conversions and integral promotions |
[edit]Explanation
The body of a switch statement may have an arbitrary number of case: labels, as long as the values of all constant_expressions are unique (after conversions/promotions). At most one default: label may be present (although nested switch statements may use their own default: labels or have case: labels whose constants are identical to the ones used in the enclosing switch)
If condition evaluates to the value that is equal to the value of one of constant_expressions, then control is transferred to the statement that is labeled with that constant_expression.
Dev C Using Switch H Case
If condition evaluates to the value that doesn't match any of the case: labels, and the default: label is present, control is transferred to the statement labeled with the default: label.
The break statement, when encountered in statement exits the switch statement:
Compilers may issue warnings on fallthrough (reaching the next case label without a break) unless the attribute If init-statement is used, the switch statement is equivalent to
Except that names declared by the init-statement (if init-statement is a declaration) and names declared by condition (if condition is a declaration) are in the same scope, which is also the scope of statement. | (since C++17) |
Because transfer of control is not permitted to enter the scope of a variable, if a declaration statement is encountered inside the statement, it has to be scoped in its own compound statement:
[edit]Keywords
switch,case,default
Switch Dev Menu Download
[edit]Example
The following code shows several usage cases of the switch statement
Without a license key, Little Snitch runs in demo mode, which provides the same protection and functionality as the full version. The demo runs for three hours, and it. Aug 26, 2016 Despite fewer malware threats to Mac systems, there is still a need for data protection. With Little Snitch for Mac, users can prevent personal information from being sent out, although its. Little Snitch. Makes these Internet connections visible and puts you back in control! Decide immediately Alert Mode. Whenever an app attempts to connect to a server on the Internet, Little Snitch shows a connection alert, allowing you to decide whether to allow or deny the connection. No data is transmitted without your consent.
Output:
[edit]See also
C documentation for switch |