{"id":4144,"date":"2020-09-30T22:59:02","date_gmt":"2020-09-30T17:29:02","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=4144"},"modified":"2020-09-30T22:59:16","modified_gmt":"2020-09-30T17:29:16","slug":"integer-constant-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/integer-constant-golang\/","title":{"rendered":"Numeric\/Integer\/Float constant in Go (Golang)"},"content":{"rendered":"\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-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/integer-constant-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/integer-constant-golang\/#Example\" title=\"Example\">Example<\/a><ul class=\"ez-toc-list-level-2\"><li class=\"ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/golangbyexamples.com\/integer-constant-golang\/#Typed_integer_constant\" title=\"Typed integer constant\">Typed integer constant<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/golangbyexamples.com\/integer-constant-golang\/#Untyped_named_integer_constant\" title=\"Untyped named integer constant\">Untyped named integer constant<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/golangbyexamples.com\/integer-constant-golang\/#Untyped_unnamed_integer_constant\" title=\"Untyped unnamed integer constant\">Untyped unnamed integer constant<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/golangbyexamples.com\/integer-constant-golang\/#Numeric_Expressions\" title=\"Numeric Expressions\">Numeric Expressions<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Numeric constant in go are further divided into three types<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Integer<\/li><li>Floats<\/li><li>Complex Numbers<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">To better understand numeric constant in golang it is important to understand typed and untyped constant in go. Please refer to this article for that &#8211;<a href=\"https:\/\/golangbyexamples.com\/typed-untyped-constant-golang\">https:\/\/golangbyexamples.com\/typed-untyped-constant-golang<\/a>\/<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Once you have gone through the article you would have understood that constant can be declared in three ways<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Typed&nbsp; constant<\/li><li>Untyped unnamed&nbsp; constant<\/li><li>Untyped named constant<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">It is the same case with numeric as well.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">A untyped integer constant (both named and unnamed) can be assigned to <strong>int<\/strong> types, <strong>float<\/strong> types and <strong>complex<\/strong> . This is because an int value can be int or float or complex. For eg int value <strong>123<\/strong> can be<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>A <strong>int<\/strong> whose value is 123<\/li><li>A <strong>float<\/strong> whose value is 123.0<\/li><li>A <strong>complex<\/strong> whose imaginary part is 0<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">On the basis of similar logic a untyped <strong>float<\/strong> constant can be assigned to all <strong>floats<\/strong> and <strong>complex<\/strong> types but not <strong>integer<\/strong> because for eg a float 5.3 cannot be an integer.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><br>On the basis of similar logic a untyped <strong>comple<\/strong> constant can be assigned to&nbsp; <strong>complex<\/strong> types but not <strong>integer <\/strong>and <strong>float<\/strong> because for eg a float 5i+3 cannot be an <strong>integer<\/strong> or a <strong>float<\/strong> <\/p>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s see a program to understand it<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example\"><\/span><strong>Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">See below program illustrating the above point. In the program we have example for<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Typed integer constant<\/li><li>Untyped unnamed integer constant<\/li><li>Untyped named integer constant<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc main() {\n\t\/\/Typed int constant\n\tconst aa int = 123\n\tvar uu = aa\n\tfmt.Println(\"Typed named integer constant\")\n\tfmt.Printf(\"uu: Type: %T Value: %v\\n\\n\", uu, uu)\n\n\t\/\/Below line will raise a compilation error\n\t\/\/var v int32 = aa\n\n\t\/\/Untyped named int constant\n\tconst bb = 123\n\tvar ww = bb\n\tvar xx int32 = bb\n\tvar yy float64 = bb\n\tvar zz complex128 = bb\n\tfmt.Println(\"Untyped named integer constant\")\n\tfmt.Printf(\"ww: Type: %T Value: %v\\n\", ww, ww)\n\tfmt.Printf(\"xx: Type: %T Value: %v\\n\", xx, xx)\n\tfmt.Printf(\"yy: Type: %T Value: %v\\n\", yy, yy)\n\tfmt.Printf(\"zz: Type: %T Value: %v\\n\\n\", zz, zz)\n\n\t\/\/Untyped unnamed int constant\n\tvar ll = 123\n\tvar mm int32 = 123\n\tvar nn float64 = 123\n\tvar oo complex128 = 123\n\tfmt.Println(\"Untyped unnamed integer constant\")\n\tfmt.Printf(\"ll: Type: %T Value: %v\\n\", ll, ll)\n\tfmt.Printf(\"mm: Type: %T Value: %v\\n\", mm, mm)\n\tfmt.Printf(\"nn: Type: %T Value: %v\\n\", nn, nn)\n\tfmt.Printf(\"oo: Type: %T Value: %v\\n\", oo, oo)\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\">Typed named integer constant\nuu: Type: int Value: 123\n\nUntyped named integer constant\nww: Type: int Value: 123\nxx: Type: int32 Value: 123\nyy: Type: float64 Value: 123\nzz: Type: complex128 Value: (123+0i)\n\nUntyped unnamed integer constant\nll: Type: int Value: 123\nmm: Type: int32 Value: 123\nnn: Type: float64 Value: 123\noo: Type: complex128 Value: (123+0i)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Now above program shows example of a<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Typed integer constant<\/li><li>Untyped unnamed integer constant<\/li><li>Untyped named integer constant<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s understand each of them and their behaviour<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Typed_integer_constant\"><\/span><strong>Typed integer constant<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">It is defined as below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">const aa int = 123<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Typed integer constant can be assigned to a variable created with <strong>var<\/strong> keyword like below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">var uu = aa<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">It will raise compilation error when assigned to another <strong>int<\/strong> type. So below raises compilation error as <strong>aa<\/strong> variable is already of type <strong>int<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">var v int32 = aa<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Untyped_named_integer_constant\"><\/span><strong>Untyped named integer constant<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">It is defined as below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">const bb = 123<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Untyped named integer constant can be assigned to any <strong>int<\/strong> type, any <strong>float<\/strong> type and any <strong>complex<\/strong> number type and also to any variable created with <strong>var<\/strong> keyword. So below works<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">var ww = bb\nvar xx int32 = bb\nvar yy float64 = bb\nvar zz complex128 = bb<\/code><\/pre>\n\n\n\n<h2 class=\"has-large-font-size wp-block-heading\"><span class=\"ez-toc-section\" id=\"Untyped_unnamed_integer_constant\"><\/span><strong>Untyped unnamed integer constant<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">It is as below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-\">123<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Untyped named integer constant can be assigned to any <strong>int<\/strong> type, any <strong>float<\/strong> type and any <strong>complex<\/strong> number type and also to any variable created with <strong>var<\/strong> keyword. So below works<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">var ww = 123\nvar xx int32 = 123\nvar yy float64 = 123\nvar zz complex128 = 123<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Numeric_Expressions\"><\/span><strong>Numeric Expressions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Due to untyped nature of constant numeric constants, different numeric constant type can be mixed and matched up to form a expression<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\nimport \"fmt\"\nfunc main() {\n    var p = 5.2 \/ 3\n    fmt.Printf(\"p: Type: %T Value: %v\\n\", p, p)\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\">p: Type: float64 Value: 1.7333333333333334<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewExampleTyped integer constantUntyped named integer constantUntyped unnamed integer constantNumeric Expressions Overview Numeric constant in go are further divided into three types Integer Floats Complex Numbers To better understand numeric&#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-4144","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 - 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