{"id":207,"date":"2025-05-02T12:19:38","date_gmt":"2025-05-02T12:19:38","guid":{"rendered":"https:\/\/techkubo.com\/cpp\/?p=207"},"modified":"2025-05-27T17:58:23","modified_gmt":"2025-05-27T17:58:23","slug":"cpp-enumeration-enum","status":"publish","type":"post","link":"https:\/\/techkubo.com\/cpp\/cpp-enumeration-enum\/","title":{"rendered":"C++ Enumeration (enum)"},"content":{"rendered":"\n

In C++, an enumeration<\/strong> (enum<\/code>) is a special data type that represents a set of constant values<\/strong>. It allows for better readability when working with predefined categories or states.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Defining an Enum<\/h2>\n\n\n\n

To create an enum. use the enum keyword followed by its name<\/strong> and a list of constants<\/strong> inside curly braces {}<\/code>.<\/p>\n\n\n\n

Example: Declaring an Enum<\/h4>\n\n\n\n
enum EngineState {  \n    OFF,  \n    IDLE,  \n    RUNNING  \n};\n<\/pre><\/div>\n\n\n\n
<\/p>\n\n\n\n
This enum groups three constant values<\/strong>:<\/p>\n\n\n\n
    \n
  • OFF<\/code> (default value 0<\/code>)<\/li>\n\n\n\n
  • IDLE<\/code> (default value 1<\/code>)<\/li>\n\n\n\n
  • RUNNING<\/code> (default value 2<\/code>)<\/li>\n<\/ul>\n\n\n\n
    <\/p>\n\n\n\n
    Using an Enum<\/h2>\n\n\n\n
    To work with an enum, declare a variable<\/strong> of its type.<\/p>\n\n\n\n
    Example: Assigning and Printing Enum Values<\/h4>\n\n\n\n
    #include <iostream>\nusing namespace std;\n\nint main() {\n    \/\/ Create an enum variable and assign a value\n    enum EngineState engineStatus = IDLE;\n\n    cout << engineStatus;  \/\/ Outputs: 1\n\n    return 0;\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Since IDLE<\/code> is the second item<\/strong>, its default value is 1<\/strong>.<\/p>\n\n\n\n
    Customizing Enum Values<\/h2>\n\n\n\n
    By default, enums start at 0<\/code> and increment by 1<\/code>, but you can assign custom values<\/strong>.<\/p>\n\n\n\n
    Example: Custom Enum Values<\/h4>\n\n\n\n
    enum EngineState {  \n    OFF = 10,  \n    IDLE = 20,  \n    RUNNING = 30  \n};\n\nint main() {\n    EngineState engineStatus = IDLE;\n    cout << engineStatus;  \/\/ Outputs: 20\n\n    return 0;\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Custom values help improve clarity<\/strong> in programs.<\/p>\n\n\n\n
    Automatic Value Increment<\/h2>\n\n\n\n
    If you set a value<\/strong> for one item, the next ones automatically increase<\/strong>.<\/p>\n\n\n\n
    Example<\/h4>\n\n\n\n
    enum EngineState {  \n    OFF = 100,  \n    IDLE,  \/\/ 101  \n    RUNNING  \/\/ 102  \n};\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Using Enum in a switch Statement<\/h2>\n\n\n\n
    Enums are often used in switch<\/code> cases for structured decision-making<\/strong>.<\/p>\n\n\n\n
    Example: Evaluating Engine Status<\/h4>\n\n\n\n
    #include <iostream>\nusing namespace std;\n\nenum EngineState {  \n    OFF = 0,  \n    IDLE,  \n    RUNNING  \n};\n\nint main() {\n    EngineState engineStatus = RUNNING;\n\n    switch (engineStatus) {\n        case OFF:\n            cout << "Engine is OFF.";\n            break;\n        case IDLE:\n            cout << "Engine is IDLING.";\n            break;\n        case RUNNING:\n            cout << "Engine is RUNNING.";\n            break;\n    }\n\n    return 0;\n}\n<\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
    In C++, an enumeration (enum) is a special data type that represents a set of constant values. It allows for […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-207","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nC++ Enumeration (enum) - C++ Tutorial<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/techkubo.com\/cpp\/cpp-enumeration-enum\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++ Enumeration (enum) - C++ Tutorial\" \/>\n<meta property=\"og:description\" content=\"In C++, an enumeration (enum) is a special data type that represents a set of constant values. 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