{"id":14225,"date":"2024-03-15T08:42:19","date_gmt":"2024-03-15T08:42:19","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-printf-in-the-c-language\/"},"modified":"2025-08-06T05:43:08","modified_gmt":"2025-08-06T05:43:08","slug":"what-is-the-usage-of-printf-in-the-c-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-printf-in-the-c-language\/","title":{"rendered":"C printf Usage Guide"},"content":{"rendered":"

The printf function in the C language is used to display output, with the following usage:<\/p>\n

    \n
  1. Grammar: the rules governing the structure of words and their arrangement in sentences.<\/li>\n<\/ol>\n
    printf<\/span>(\"\u683c\u5f0f\u63a7\u5236\u5b57\u7b26\u4e32\"<\/span>, \u53c2\u65701<\/span>, \u53c2\u65702<\/span>, ...);\r\n<\/code><\/pre>\n
    In the format control string, there can be both regular characters and format conversion directives to specify the output format, while the parameters are the content to be output.<\/p>\n
      \n
    1. Format conversion indicator:<\/li>\n<\/ol>\n
        \n
      1. %d: output a signed decimal integer.<\/li>\n
      2. Output a decimal unsigned integer.<\/li>\n
      3. %f: Output a floating-point number.<\/li>\n
      4. %c: outputs a single character.<\/li>\n
      5. %s: Prints out a string.<\/li>\n
      6. %p: print out the value of the pointer.<\/li>\n<\/ol>\n
          \n
        1. \u539f\u6587\uff1a\u6211\u559c\u6b22\u8bfb\u4e66\uff0c\u56e0\u4e3a\u5b83\u8ba9\u6211\u611f\u89c9\u5230\u5f88\u653e\u677e\u3002
          \nParaphrase: I enjoy reading because it helps me relax.<\/li>\n<\/ol>\n
          int<\/span> num = 10<\/span>;\r\nfloat<\/span> f = 3.14<\/span>;\r\nchar<\/span> ch = 'A'<\/span>;\r\nchar<\/span> str[10<\/span>] = \"Hello\"<\/span>;\r\nprintf<\/span>(\"\u6574\u6570\uff1a%d\\n\"<\/span>, num);\r\nprintf<\/span>(\"\u6d6e\u70b9\u6570\uff1a%f\\n\"<\/span>, f);\r\nprintf<\/span>(\"\u5b57\u7b26\uff1a%c\\n\"<\/span>, ch);\r\nprintf<\/span>(\"\u5b57\u7b26\u4e32\uff1a%s\\n\"<\/span>, str);\r\nprintf<\/span>(\"\u6307\u9488\uff1a%p\\n\"<\/span>, &num);\r\n<\/code><\/pre>\n
          Output the result:<\/p>\n
          \u6574\u6570\uff1a10\r\n\u6d6e\u70b9\u6570\uff1a3.140000\r\n\u5b57\u7b26\uff1aA\r\n\u5b57\u7b26\u4e32\uff1aHello\r\n\u6307\u9488\uff1a0x7ffd324e6aac\r\n<\/code><\/pre>\n
          Please note that in format control strings, the characters following the % sign such as numbers, symbols, and periods can be used to specify the output format. For example, %5d represents a decimal integer with a width of 5, and %.2f represents a floating point number with two decimal places. For more detailed format specifications, refer to the C language’s formatting input and output documentation.<\/p>\n","protected":false},"excerpt":{"rendered":"
          The printf function in the C language is used to display output, with the following usage: Grammar: the rules governing the structure of words and their arrangement in sentences. printf(“\u683c\u5f0f\u63a7\u5236\u5b57\u7b26\u4e32”, \u53c2\u65701, \u53c2\u65702, …); In the format control string, there can be both regular characters and format conversion directives to specify the output format, while the […]<\/p>\n","protected":false},"author":14,"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":[698,381,9473,3916,1806],"class_list":["post-14225","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c-functions","tag-c-programming","tag-format-specifiers","tag-output-formatting","tag-printf"],"yoast_head":"\nC printf Usage Guide - Blog - 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