{"id":22492,"date":"2024-03-15T23:40:47","date_gmt":"2024-03-15T23:40:47","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-custom-function-in-c-language\/"},"modified":"2024-03-21T23:00:46","modified_gmt":"2024-03-21T23:00:46","slug":"how-to-call-a-custom-function-in-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-call-a-custom-function-in-c-language\/","title":{"rendered":"How to call a custom function in C language?"},"content":{"rendered":"<p>To invoke a custom function, follow these steps:<\/p>\n<ol>\n<li>Function declaration: Before calling a custom function in the program, it is necessary to declare the function. The function declaration includes the return type, function name, and parameter types.<\/li>\n<li>Function definition: Specifying the concrete implementation of a function at a certain place in the program. A function definition includes the return type, function name, types of parameters, and function body.<\/li>\n<li>Function call: Invoking a function at a specific location in a program. It involves using the function name and its parameters.<\/li>\n<\/ol>\n<p>Below is a sample code demonstrating how to call a custom function.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-comment\">\/\/ \u51fd\u6570\u7684\u58f0\u660e<\/span>\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">add<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> num1, <span class=\"hljs-type\">int<\/span> num2)<\/span>;\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> result;\r\n    \r\n    <span class=\"hljs-comment\">\/\/ \u51fd\u6570\u7684\u8c03\u7528<\/span>\r\n    result = add(<span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">3<\/span>);\r\n    \r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"The sum is %d\\n\"<\/span>, result);\r\n    \r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u51fd\u6570\u7684\u5b9a\u4e49<\/span>\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">add<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> num1, <span class=\"hljs-type\">int<\/span> num2)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> sum = num1 + num2;\r\n    <span class=\"hljs-keyword\">return<\/span> sum;\r\n}\r\n<\/code><\/pre>\n<p>In the example code above, we first declare a function called &#8220;add&#8221; at the beginning of the program. This function takes two integer parameters and returns an integer value. We then call the &#8220;add&#8221; function in the main function and assign its return value to the variable &#8220;result&#8221;. Finally, we use the printf function to output the result.<\/p>\n<p>It is important to note that the function declaration can be placed at the beginning of the program or before the function is called, but the function definition must come before the function is called. This is because in the function declaration, the compiler only needs to know the return type, function name, and parameter types of the function, without needing to know the specific implementation of the function. However, in the function definition, the compiler needs to know the specific implementation of the function in order to correctly generate executable code.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To invoke a custom function, follow these steps: Function declaration: Before calling a custom function in the program, it is necessary to declare the function. The function declaration includes the return type, function name, and parameter types. Function definition: Specifying the concrete implementation of a function at a certain place in the program. A function [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-22492","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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>How to call a custom function in C language? - Blog - Silicon Cloud<\/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:\/\/www.silicloud.com\/blog\/how-to-call-a-custom-function-in-c-language\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to call a custom function in C language?\" \/>\n<meta property=\"og:description\" content=\"To invoke a custom function, follow these steps: Function declaration: Before calling a custom function in the program, it is necessary to declare the function. 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