{"id":5799,"date":"2021-06-06T11:35:37","date_gmt":"2021-06-06T06:05:37","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=5799"},"modified":"2021-06-06T11:44:03","modified_gmt":"2021-06-06T06:14:03","slug":"println-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/println-golang\/","title":{"rendered":"Understanding Println function in Go (Golang)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println-1024x574.png?resize=381%2C213&#038;ssl=1\" alt=\"println\" class=\"wp-image-5800\" width=\"381\" height=\"213\" srcset=\"https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println.png?resize=1024%2C574&amp;ssl=1 1024w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println.png?resize=300%2C168&amp;ssl=1 300w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println.png?resize=768%2C430&amp;ssl=1 768w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println.png?resize=1536%2C861&amp;ssl=1 1536w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println.png?resize=2048%2C1148&amp;ssl=1 2048w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println.png?resize=850%2C476&amp;ssl=1 850w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println.png?w=1280&amp;ssl=1 1280w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/06\/println.png?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 381px) 100vw, 381px\" data-recalc-dims=\"1\" \/><\/figure>\n\n\n\n<p> <\/p>\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\/println-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\/println-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>Println<\/strong> is defined in the <strong>fmt<\/strong> package and is used to format a string and write to standard output<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><a href=\"https:\/\/golang.org\/pkg\/fmt\/#Println\">https:\/\/golang.org\/pkg\/fmt\/#Println<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Below is the function prototype of <strong>Println<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">func Println(a ...interface{}) (n int, err error)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Println<\/strong> formats the string using the default format specifier adds a new line after the string. <strong>Println<\/strong> takes a variable number of arguments where each argument is an empty interface. It returns the number of characters printed and any error if happens. 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>Println<\/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. Let&#8217;s&nbsp; see an example<\/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<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\nimport \"fmt\"\ntype employee struct {\n    Name string\n    Age  int\n}\nfunc main() {\n    name := \"John\"\n    age := 21\n    fmt.Println(\"Name is: \", name)\n    fmt.Println(\"Age is: \", age)\n    e := employee{\n        Name: name,\n        Age:  age,\n    }\n    fmt.Println(e)\n    fmt.Println(\"a\", 12, \"b\", 12.0)\n\n    \n    bytesPrinted, err := fmt.Println(\"Name is: \", name)\n    if err != nil {\n\tlog.Fatalln(\"Error occured\", err)\n    }\n    fmt.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}\na 12 b 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>Println<\/strong> function<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>It appends a newline at the end. That is why each of the output is on a different line<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Each of the arguments will be separated by space in the output. That is why<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">fmt.Println(\"Name is: \", name)<\/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\">Name is: John<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Space is introduced automatically between the two arguments.<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>It returns the number of characters printed or any error if happens<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">bytesPrinted, err := fmt.Println(\"Name is: \", name)\nif err != nil {\n    log.Fatalln(\"Error occured\", err)\n}\nfmt.Println(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\">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 Println is defined in the fmt package and is used to format a string and write to standard output https:\/\/golang.org\/pkg\/fmt\/#Println Below is the function prototype of Println&#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":[],"class_list":["post-5799","post","type-post","status-publish","format-standard","hentry","category-tech"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - 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