{"id":2859,"date":"2024-03-13T05:34:33","date_gmt":"2024-03-13T05:34:33","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-for-assigning-values-to-a-c-language-double-pointer\/"},"modified":"2024-03-19T14:46:39","modified_gmt":"2024-03-19T14:46:39","slug":"what-is-the-method-for-assigning-values-to-a-c-language-double-pointer","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-for-assigning-values-to-a-c-language-double-pointer\/","title":{"rendered":"What is the method for assigning values to a C language double pointer?"},"content":{"rendered":"<p>In C language, a double pointer refers to a pointer that points to another pointer. To assign a value to a double pointer, first define a single pointer that points to a variable, and then define a double pointer that points to this single pointer. Finally, assign a value to the single pointer through the double pointer.<\/p>\n<p>Below is an example code:<\/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-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> num = <span class=\"hljs-number\">10<\/span>;\r\n    <span class=\"hljs-type\">int<\/span> *ptr = &amp;num; <span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u4e00\u7ea7\u6307\u9488\u6307\u5411num\u53d8\u91cf<\/span>\r\n    <span class=\"hljs-type\">int<\/span> **pptr = &amp;ptr; <span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u4e8c\u7ea7\u6307\u9488\u6307\u5411ptr\u6307\u9488<\/span>\r\n\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"num = %d\\n\"<\/span>, num);\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"*ptr = %d\\n\"<\/span>, *ptr);\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"**pptr = %d\\n\"<\/span>, **pptr);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u7ed9\u4e8c\u7ea7\u6307\u9488\u8d4b\u503c<\/span>\r\n    <span class=\"hljs-type\">int<\/span> newNum = <span class=\"hljs-number\">20<\/span>;\r\n    *ptr = newNum;\r\n\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"num = %d\\n\"<\/span>, num);\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"*ptr = %d\\n\"<\/span>, *ptr);\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"**pptr = %d\\n\"<\/span>, **pptr);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In the example above, we first defined a variable num, then defined a first-level pointer ptr pointing to the num variable. Next, we defined a second-level pointer pptr pointing to the ptr pointer. By assigning a value to ptr using the second-level pointer pptr, we indirectly modified the value of num.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C language, a double pointer refers to a pointer that points to another pointer. To assign a value to a double pointer, first define a single pointer that points to a variable, and then define a double pointer that points to this single pointer. Finally, assign a value to the single pointer through the [&hellip;]<\/p>\n","protected":false},"author":13,"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-2859","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>What is the method for assigning values to a C language double pointer? - 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\/what-is-the-method-for-assigning-values-to-a-c-language-double-pointer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the method for assigning values to a C language double pointer?\" \/>\n<meta property=\"og:description\" content=\"In C language, a double pointer refers to a pointer that points to another pointer. 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