{"id":4917,"date":"2024-03-14T02:08:04","date_gmt":"2024-03-14T02:08:04","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-declare-variables-and-constants-in-c\/"},"modified":"2025-07-31T15:18:34","modified_gmt":"2025-07-31T15:18:34","slug":"how-to-declare-variables-and-constants-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-declare-variables-and-constants-in-c\/","title":{"rendered":"C# Variables and Constants: Declaration Guide"},"content":{"rendered":"<p>The way to declare variables and constants in C# is as follows:<\/p>\n<p>Declare variables.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u58f0\u660e\u4e00\u4e2a\u6574\u578b\u53d8\u91cf<\/span>\r\n<span class=\"hljs-built_in\">int<\/span> num;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u58f0\u660e\u5e76\u521d\u59cb\u5316\u4e00\u4e2a\u5b57\u7b26\u4e32\u53d8\u91cf<\/span>\r\n<span class=\"hljs-built_in\">string<\/span> name = <span class=\"hljs-string\">\"Alice\"<\/span>;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u58f0\u660e\u4e00\u4e2a\u6d6e\u70b9\u578b\u53d8\u91cf\u5e76\u8d4b\u503c<\/span>\r\n<span class=\"hljs-built_in\">float<\/span> salary;\r\nsalary = <span class=\"hljs-number\">5000.50f<\/span>;\r\n<\/code><\/pre>\n<p>Declare a constant:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u58f0\u660e\u4e00\u4e2a\u6574\u578b\u5e38\u91cf<\/span>\r\n<span class=\"hljs-keyword\">const<\/span> <span class=\"hljs-built_in\">int<\/span> MAX_NUM = <span class=\"hljs-number\">100<\/span>;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u58f0\u660e\u4e00\u4e2a\u5b57\u7b26\u4e32\u5e38\u91cf<\/span>\r\n<span class=\"hljs-keyword\">const<\/span> <span class=\"hljs-built_in\">string<\/span> COMPANY_NAME = <span class=\"hljs-string\">\"ABC Company\"<\/span>;\r\n<\/code><\/pre>\n<p>It is important to note that once a constant is assigned a value, it cannot be changed, whereas the value of a variable can be modified within the program.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The way to declare variables and constants in C# is as follows: Declare variables. \/\/ \u58f0\u660e\u4e00\u4e2a\u6574\u578b\u53d8\u91cf int num; \/\/ \u58f0\u660e\u5e76\u521d\u59cb\u5316\u4e00\u4e2a\u5b57\u7b26\u4e32\u53d8\u91cf string name = &#8220;Alice&#8221;; \/\/ \u58f0\u660e\u4e00\u4e2a\u6d6e\u70b9\u578b\u53d8\u91cf\u5e76\u8d4b\u503c float salary; salary = 5000.50f; Declare a constant: \/\/ \u58f0\u660e\u4e00\u4e2a\u6574\u578b\u5e38\u91cf const int MAX_NUM = 100; \/\/ \u58f0\u660e\u4e00\u4e2a\u5b57\u7b26\u4e32\u5e38\u91cf const string COMPANY_NAME = &#8220;ABC Company&#8221;; It is important to note that [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[3401,4664,824,381,4949],"class_list":["post-4917","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-constants","tag-c-declaration","tag-c-basics","tag-c-programming","tag-variables-in-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C# Variables and Constants: Declaration Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to declare variables and constants in C# with clear examples. 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