{"id":5558,"date":"2021-05-01T21:59:39","date_gmt":"2021-05-01T16:29:39","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=5558"},"modified":"2021-05-02T16:16:04","modified_gmt":"2021-05-02T10:46:04","slug":"fprint-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/fprint-golang\/","title":{"rendered":"Understanding Fprint function in Go (Golang)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang-1024x574.png?resize=399%2C223&#038;ssl=1\" alt=\"\" class=\"wp-image-5559\" width=\"399\" height=\"223\" srcset=\"https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang.png?resize=1024%2C574&amp;ssl=1 1024w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang.png?resize=300%2C168&amp;ssl=1 300w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang.png?resize=768%2C430&amp;ssl=1 768w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang.png?resize=1536%2C861&amp;ssl=1 1536w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang.png?resize=2048%2C1148&amp;ssl=1 2048w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang.png?resize=850%2C476&amp;ssl=1 850w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang.png?w=1280&amp;ssl=1 1280w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/05\/fprint_golang.png?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 399px) 100vw, 399px\" data-recalc-dims=\"1\" \/><\/figure>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/fprint-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/fprint-golang\/#Program\" title=\"Program\">Program<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Fprint<\/strong> is defined in the <strong>fmt<\/strong> package and is used to format a string using the default format specifier and write it to <strong>io.Writer<\/strong> instance passed to it.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><a href=\"https:\/\/golang.org\/pkg\/fmt\/#Fprint\">https:\/\/golang.org\/pkg\/fmt\/#Fprint<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Below is the function prototype of <strong>Fprint<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">func Fprint(w io.Writer, a ...interface{}) (n int, err error)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Fprint<\/strong> is also a variadic function meaning that it can have multiple arguments.\u00a0Here are the details about its arguments<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>The first argument is the <strong>io.Writer<\/strong> instance to which it writes<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>The next is a variable number of arguments. Each of the arguments in this list could be string, int, struct, or anything. That is why it is an empty interface. Each of these arguments is formatted using the default specifier<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Fprint<\/strong> formats the string using the default format specifier but does not add a new line after the string. <strong>Fprint<\/strong> takes a variable number of arguments after the first argument where each argument is an empty interface. Since the argument type is an empty interface we can pass any data type to it. We can pass a string, int, float, struct, or any other data type. Each of the arguments to the <strong>Fprint<\/strong> function is formatted according to the default format specifier of that argument type. For example, the struct will be formatted according to the below specifier<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">%v<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">This format specifier only prints the Value part in the struct. There is also one more function provided by <strong>fmt<\/strong> package which appends a new line &#8211; <strong>Fprintln<\/strong>.<\/p>\n\n\n\n<h2 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Program\"><\/span><strong>Program<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s see an example for the same<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n\t\"fmt\"\n\t\"log\"\n\t\"os\"\n)\n\ntype employee struct {\n\tName string\n\tAge  int\n}\n\nfunc main() {\n\tname := \"John\"\n\tage := 21\n\n\tfmt.Fprint(os.Stdout, \"Name is:\", name, \"\\n\")\n\tfmt.Fprint(os.Stdout, \"Age is:\", age, \"\\n\")\n\n\te := employee{\n\t\tName: name,\n\t\tAge:  age,\n\t}\n\n\tfmt.Fprint(os.Stdout, e, \"\\n\")\n\n\tfmt.Fprint(os.Stdout, \"a\", 12, \"b\", 12.0, \"\\n\")\n\n\tfmt.Fprint(os.Stdout, 12, 12.0, \"\\n\")\n\n\tbytesPrinted, err := fmt.Fprint(os.Stdout, \"Name is: \", name, \"\\n\")\n\tif err != nil {\n\t\tlog.Fatalln(\"Error occured\", err)\n\t}\n\tfmt.Println(bytesPrinted)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Name is:John\nAge is:21\n{John 21}\na12b12\n12 12\nName is: John\n14<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Some important points to note about the <strong>Fprint<\/strong> function<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>In all the <strong>Fprint <\/strong>function above we pass it the instance of <strong>os.Stdout<\/strong> to it which implements the <strong>io.Writer<\/strong> interface. Basically with <strong>os.Stdout<\/strong>, <strong>Fprint <\/strong>writes to standard output. This is how <strong>os.Stdout<\/strong> is defined.<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Stdout = NewFile(uintptr(syscall.Stdout), \"\/dev\/stdout\")<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>It does not append a new line at the end. That is why need to use <strong>&#8220;\\n&#8221;<\/strong> for adding a new line.<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>It only adds space between two arguments if each of them is a non-string. That is why<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">fmt.Fprint(os.Stdout, 12, 12.0, \"\\n\")<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">prints<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">12 12<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">while<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">fmt.Fprint(os.Stdout, \"a\", 12, \"b\", 12.0, \"\\n\")<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">prints<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">a12b12<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>It also returns the number of characters printed and any error if happens<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">bytesPrinted, err := fmt.Fprint(os.Stdout, \"Name is: \", name, \"\\n\")\nif err != nil {\n    log.Fatalln(\"Error occured\", err)\n}\nfmt.Fprint(bytesPrinted)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">will output below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Name is: John\n14<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">The number of <strong>bytesPrinted<\/strong> is 14 as 14 characters are outputted<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Fprint <\/strong>can also be used to write to a file. Since the file instance in golang implements the <strong>io.Writer<\/strong>, this is not a problem. Below is the program for the same<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\nimport (\n    \"fmt\"\n    \"log\"\n    \"os\"\n)\ntype employee struct {\n    Name string\n    Age  int\n}\nfunc main() {\n    file, err := os.Create(\".\/temp.txt\")\n    if err != nil {\n        log.Fatal(err)\n    }\n    name := \"John\"\n    age := 21\n    fmt.Fprint(file, \"Name is:\", name, \"\\n\")\n    fmt.Fprint(file, \"Age is:\", age, \"\\n\")\n    e := employee{\n        Name: name,\n        Age:  age,\n    }\n    fmt.Fprint(file, e, \"\\n\")\n    fmt.Fprint(file, \"a\", 12, \"b\", 12.0, \"\\n\")\n    fmt.Fprint(file, 12, 12.0, \"\\n\")\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\">It will create file name temp.txt in the current directory with the below contents. In this program we replaced <strong>os.Stdou<\/strong>t with the file created.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Name is:John\nAge is:21\n{John 21}\na12b12\n12 12<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Also, check out our Golang advance tutorial Series &#8211; <a href=\"https:\/\/golangbyexamples.com\/golang-comprehensive-tutorial\/\">Golang Advance Tutorial<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewProgram Overview Fprint is defined in the fmt package and is used to format a string using the default format specifier and write it to io.Writer instance passed to&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[3,4],"class_list":["post-5558","post","type-post","status-publish","format-standard","hentry","category-tech","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Understanding Fprint function in Go (Golang) - Welcome To Golang By Example<\/title>\n<meta name=\"description\" content=\"This tutorial contains the details of Fprint function in golang with lot of examples. 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