{"id":2642,"date":"2022-05-28T21:16:17","date_gmt":"2022-05-28T13:16:17","guid":{"rendered":"https:\/\/jimmyswebnote.com\/?p=2642"},"modified":"2022-05-28T21:19:26","modified_gmt":"2022-05-28T13:19:26","slug":"ruby-integer-float-object","status":"publish","type":"post","link":"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/","title":{"rendered":"Ruby \u6559\u5b78 6 &#8211; Ruby Integer Object, Ruby Float Object \u4ecb\u7d39"},"content":{"rendered":"\n<p>\u5728 Ruby \u4e2d\uff0c\u6578\u5b57\u5206\u70ba\u5169\u7a2e object\uff1aInteger \u548c Float\uff0c\u5206\u5225\u4ee3\u8868\u6574\u6578\u548c\u6d6e\u9ede\u6578\uff0c\u5169\u500b Class \u90fd\u662f\u5f9e Numeric object \u7e7c\u627f\u800c\u4f86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3\nnum2 = 3.14\n\np num1.class\n# Integer\np num2.class\n# Float\np num1.class.superclass\n# Numeric\np num2.class.superclass\n# Numeric\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-verse\">Integer, Float \u548c Symbol \u662f Ruby \u4e2d\u6bd4\u8f03\u7279\u5225\u7684 class\uff0c\u7121\u6cd5\u7528 .new \u5ba3\u544a\u65b0\u7684 object instance\uff0c\u53ef\u4ee5\u53c3\u8003\u9019\u7bc7\u8cc7\u6599\uff1a<a href=\"https:\/\/stackoverflow.com\/questions\/45693111\/why-cant-i-instantiate-integer-class-in-ruby\" target=\"_blank\" rel=\"noreferrer noopener\">Why can't I instantiate Integer class in Ruby? - Stack Overflow<\/a><\/pre>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-663351afc9501\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-663351afc9501\"  aria-label=\"Toggle\" \/><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:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#1_%E5%AE%A3%E5%91%8A_Ruby_Integer_Float_Object\" title=\"1. \u5ba3\u544a Ruby Integer, Float Object\">1. \u5ba3\u544a Ruby Integer, Float Object<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#11_Integer\" title=\"1.1 Integer\">1.1 Integer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#12_Float\" title=\"1.2 Float\">1.2 Float<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#2_Operators\" title=\"2. Operators\">2. Operators<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#21_Equal\" title=\"2.1 Equal ==\">2.1 Equal ==<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#22_Inequal\" title=\"2.2 Inequal !=\">2.2 Inequal !=<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#23_Spaceship_Operator\" title=\"2.3 Spaceship Operator &lt;=&gt;\">2.3 Spaceship Operator &lt;=><\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#24_Arithmetic_Operators\" title=\"2.4 Arithmetic Operators\">2.4 Arithmetic Operators<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#3_Integer_Instance_Methods\" title=\"3. Integer Instance Methods\">3. Integer Instance Methods<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#31_Integer_oddeven\" title=\"3.1 Integer odd?\/even?\">3.1 Integer odd?\/even?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#32_Integer_abs\" title=\"3.2 Integer abs\">3.2 Integer abs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#32_Integer_to_f\" title=\"3.2 Integer to_f\">3.2 Integer to_f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#33_Integer_to_s\" title=\"3.3 Integer to_s\">3.3 Integer to_s<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#4_Float_Instance_Methods\" title=\"4. Float Instance Methods\">4. Float Instance Methods<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#41_Float_floor\" title=\"4.1 Float floor\">4.1 Float floor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#42_Float_ceil\" title=\"4.2 Float ceil\">4.2 Float ceil<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#43_Float_round\" title=\"4.3 Float round\">4.3 Float round<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#44_Float_truncate\" title=\"4.4 Float truncate\">4.4 Float truncate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#45_Floor_abs\" title=\"4.5 Floor abs\">4.5 Floor abs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#46_Float_to_i\" title=\"4.6 Float to_i\">4.6 Float to_i<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/jimmyswebnote.com\/ruby-integer-float-object\/#5_%E5%8F%83%E8%80%83%E8%B3%87%E6%96%99\" title=\"5. \u53c3\u8003\u8cc7\u6599\">5. \u53c3\u8003\u8cc7\u6599<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1_%E5%AE%A3%E5%91%8A_Ruby_Integer_Float_Object\"><\/span>1. \u5ba3\u544a Ruby Integer, Float Object<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"11_Integer\"><\/span>1.1 Integer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u8aa0\u5982\u4e0a\u9762\u63d0\u5230\u7684\uff0c\u7121\u6cd5\u7528 class.new \u5ba3\u544a\u65b0\u7684 object instance\uff0c\u4f46\u53ef\u4ee5\u76f4\u63a5\u5728 Integer class \u5f8c\u9762\u63a5\u8981\u5ba3\u544a\u7684 value\uff0cInteger \u5f8c\u9762\u6709\u5169\u500b argument\uff1a<\/p>\n\n\n\n<ul><li>\u7b2c\u4e00\u500b argument \u70ba Integer \u7684 value\uff0c\u7576\u53ea\u6709\u9019\u500b argument \u6642\uff0cinput Integer \u6216 String \u90fd\u53ef\u4ee5<\/li><li>\u7b2c\u4e8c\u500b argument \u70ba\u5e7e\u9032\u4f4d\uff0c\u6709\u9019\u500b argument \u6642\uff0c\u7b2c\u4e00\u500b argument \u53ea\u80fd\u8f38\u5165\u5b57\u4e32\uff0c\u5426\u5247\u6703\u6709 error<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">p Integer(10)\n# 10\np Integer('10')\n# default \u70ba 10 \u9032\u4f4d\n# 10\np Integer('10', 2)\n# 2 \u9032\u4f4d\n# 2\np Integer('10', 16)\n# 16 \u9032\u4f4d\n# 16\n\np Integer('0b10')\n# 2\n# 0b \u4ee3\u8868 2 \u9032\u4f4d\np Integer('010')\n# 8\n# 0 \u4ee3\u8868 8 \u9032\u4f4d\np Integer('0x10')\n# 16\n# 0b \u4ee3\u8868 16 \u9032\u4f4d<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"12_Float\"><\/span>1.2 Float<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Float \u5c31\u6c92\u90a3\u9ebc\u591a\u8b8a\u5316\u4e86\uff0c\u5f8c\u9762\u76f4\u63a5\u63a5\u8981\u5ba3\u544a\u7684 Float object value\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = Float(3.14)\nnum2 = Float(\"3.14\")\nnum3 = Float(3)\n\np num1\n# 3.14\np num2\n# 3.14\np num3\n# 3.0<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"2_Operators\"><\/span>2. Operators<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4ecb\u7d39\u4e00\u4e0b Numeric object \u5e38\u7528\u5230\u7684 operators\uff1a<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"21_Equal\"><\/span>2.1 Equal ==<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6703\u6bd4\u8f03\u5169\u908a\u7684 object \u662f\u5426\u76f8\u7b49\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3\nnum2 = 3.0\nnum3 = \"3\"\n\np num1 == num2\n# true\np num1 == num3\n# false<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"22_Inequal\"><\/span>2.2 Inequal !=<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6703\u6bd4\u8f03\u5169\u908a\u7684 object \u662f\u5426\u4e0d\u7b49\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3\nnum2 = 3.0\nnum3 = \"3\"\n\np num1 != num2\n# false\np num1 != num3\n# true<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"23_Spaceship_Operator\"><\/span>2.3 Spaceship Operator &lt;=><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u56e0\u70ba &lt;=> \u9577\u5f97\u50cf spaceship\uff0c\u56e0\u6b64\u7a31\u70ba spaceship operator\u3002<\/p>\n\n\n\n<ul><li>\u53f3\u908a\u5927\u65bc\u5de6\u908a\uff1a\u56de\u50b3 -1<\/li><li>\u5de6\u908a\u5927\u65bc\u53f3\u908a\uff1a\u56de\u50b3 1<\/li><li>\u5169\u908a\u76f8\u7b49\uff1a\u56de\u50b3 0<\/li><\/ul>\n\n\n\n<p>spaceship operator \u5e38\u7528\u5728 array \u7684 sort \u4e2d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">p 3 &lt;=> 5\n# -1\np 7 &lt;=> 5\n# 1\np 5 &lt;=> 5\n# 0<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"24_Arithmetic_Operators\"><\/span>2.4 Arithmetic Operators<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u7c21\u55ae\u4ecb\u7d39\u4e00\u4e0b\u56db\u5247\u904b\u7b97\u7b26\u865f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">p 4 + 3\np 4.+(3)\np 4.+ 3\n# 7\n\np 4 - 3\np 4.-(3)\np 4.- 3\n# 1\n\np 4 * 3\np 4.*(3)\np 4.* 3\n# 12\n\np 4 \/ 3\np 4.\/(3)\np 4.\/ 3\np 4.div(3)\n# 1\n\np 4 % 3\np 4.%(3)\np 4.% 3\np 4.modulo(3)\n# 1<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"3_Integer_Instance_Methods\"><\/span>3. Integer Instance Methods<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"31_Integer_oddeven\"><\/span>3.1 Integer odd?\/even?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.odd? \u548c .even? \u7528\u4f86\u5224\u65b7\u6574\u6578\u662f\u5947\u6578\u9084\u662f\u5076\u6578\uff0c\u56e0\u6b64\u53ea\u5b58\u5728\u65bc Integer object instance\uff0c\u4e0d\u5b58\u5728\u65bc Float object instance\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">p 3.odd?\n# true\np 3.even?\n# false\np 3.14.odd?\n# Error!<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"32_Integer_abs\"><\/span>3.2 Integer abs<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u53d6\u7d55\u5c0d\u503c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3\nnum2 = -3\n\np num1.abs\n# 3\np num2.abs\n# 3<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"32_Integer_to_f\"><\/span>3.2 Integer to_f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5c07 Integer object \u8f49\u6210 Float object \u4e26\u56de\u50b3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num = 3\n\np num.to_f\n# 3.0\np num.to_f.class\n# Float<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"33_Integer_to_s\"><\/span>3.3 Integer to_s<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5c07 Integer object \u8f49\u6210 String object \u4e26\u56de\u50b3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num = 3\n\np num.to_s\n# \"3\"\np num.to_s.class\n# String<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"4_Float_Instance_Methods\"><\/span>4. Float Instance Methods<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"41_Float_floor\"><\/span>4.1 Float floor<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u56de\u50b3 &lt;= object \u7684\u6700\u5927 Integer \u6216 Float\u3002<\/p>\n\n\n\n<p>\u6c92\u6709 argument \u6642\u56de\u50b3\u6574\u6578\uff0c\u6709 argument \u6642\uff0cargument \u70ba\u53d6\u5c0f\u6578\u9ede\u5230\u5e7e\u4f4d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3.14\nnum2 = 3.64\nnum3 = -3.14\nnum4 = -3.64\n\np num1.floor\n# 3\np num2.floor\n# 3\np num3.floor\n# -4\np num4.floor\n# -4\n\nnum5 = 12345.6789\nnum6 = -12345.6789\n\np num5.floor(1)\n# 12345.6\np num5.floor(3)\n# 12345.678\np num6.floor(1)\n# -12345.7\np num6.floor(3)\n# -12345.679\n<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"42_Float_ceil\"><\/span>4.2 Float ceil<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u7121\u689d\u4ef6\u9032\u4f4d\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3.14\nnum2 = 3.64\nnum3 = -3.14\nnum4 = -3.64\n\np num1.ceil\n# 4\np num2.ceil\n# 4\np num3.ceil\n# -3\np num4.ceil\n# -3\n\nnum5 = 12345.6789\nnum6 = -12345.6789\n\np num5.ceil(1)\n# 12345.7\np num5.ceil(3)\n# 12345.679\np num6.ceil(1)\n# -12345.6\np num6.ceil(3)\n# -12345.678<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"43_Float_round\"><\/span>4.3 Float round<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u56db\u6368\u4e94\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3.14\nnum2 = 3.64\nnum3 = -3.14\nnum4 = -3.64\n\np num1.round\n# 3\np num2.round\n# 4\np num3.round\n# -3\np num4.round\n# -4\n\nnum5 = 12345.6789\nnum6 = -12345.6789\n\np num5.round(1)\n# 12345.7\np num5.round(3)\n# 12345.679\np num6.round(1)\n# -12345.7\np num6.round(3)\n# -12345.679\n<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"44_Float_truncate\"><\/span>4.4 Float truncate<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u7121\u689d\u4ef6\u6368\u53bb<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3.14\nnum2 = 3.64\nnum3 = -3.14\nnum4 = -3.64\n\np num1.truncate\n# 3\np num2.truncate\n# 3\np num3.truncate\n# -3\np num4.truncate\n# -3\n\nnum5 = 12345.6789\nnum6 = -12345.6789\n\np num5.truncate(1)\n# 12345.6\np num5.truncate(3)\n# 12345.678\np num6.truncate(1)\n# -12345.6\np num6.truncate(3)\n# -12345.678<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"45_Floor_abs\"><\/span>4.5 Floor abs<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u53d6\u7d55\u5c0d\u503c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3.14\nnum2 = 3.64\nnum3 = -3.14\nnum4 = -3.64\n\np num1.abs\n# 3.14\np num2.abs\n# 3.64\np num3.abs\n# 3.14\np num4.abs\n# 3.64<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"46_Float_to_i\"><\/span>4.6 Float to_i<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u8f49\u63db\u6210 Integer object \u5f8c\u56de\u50b3\uff0c\u4f7f\u7528\u7684\u662f truncate \u65b9\u6cd5 ( \u56e0\u6b64\u548c .truncate \u6216\u662f .truncate(0) \u4e00\u6a23 )\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">num1 = 3.14\nnum2 = 3.64\nnum3 = -3.14\nnum4 = -3.64\n\np num1.to_i\n# 3\np num2.to_i\n# 3\np num3.to_i\n# -3\np num4.to_i\n# -3<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"5_%E5%8F%83%E8%80%83%E8%B3%87%E6%96%99\"><\/span>5. \u53c3\u8003\u8cc7\u6599<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.udemy.com\/course\/learn-to-code-with-ruby-lang\/\" target=\"_blank\" rel=\"noreferrer noopener\">Learn to Code with Ruby<\/a><br><a href=\"https:\/\/ruby-doc.org\/core-3.1.2\/Integer.html\" target=\"_blank\" rel=\"noopener\">Class: Integer (Ruby 3.1.2)<\/a><br><a href=\"https:\/\/ruby-doc.org\/core-3.1.2\/Float.html\" target=\"_blank\" rel=\"noopener\">Class: Float (Ruby 3.1.2)<\/a><br><a href=\"https:\/\/ruby-doc.org\/core-3.1.2\/Numeric.html\" target=\"_blank\" rel=\"noopener\">Class: Numeric (Ruby 3.1.2)<\/a><\/p>\n\n\n\n\n\n<p>\u5982\u679c\u89ba\u5f97\u6211\u7684\u6587\u7ae0\u6709\u5e6b\u52a9\u7684\u8a71\uff0c\u6b61\u8fce\u5e6b\u6211\u7684\u7c89\u5c08\u6309\u8b9a\u54e6~\u8b1d\u8b1d\u4f60\uff01<br><\/p>\n\n<iframe loading=\"lazy\" src=\"https:\/\/www.facebook.com\/plugins\/page.php?href=https%3A%2F%2Fwww.facebook.com%2Fjimmyswebnote&amp;tabs=timeline&amp;width=340&amp;height=500&amp;small_header=false&amp;adapt_container_width=true&amp;hide_cover=false&amp;show_facepile=true&amp;appId\" width=\"340\" height=\"500\" style=\"border:none;overflow:hidden\" scrolling=\"no\" frameborder=\"0\" allowfullscreen=\"true\" allow=\"autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share\"><\/iframe>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Ruby \u4e2d\uff0c\u6578\u5b57\u5206\u70ba\u5169\u7a2e object\uff1aInteger \u548c Float\uff0c\u5206\u5225\u4ee3\u8868\u6574\u6578\u548c\u6d6e\u9ede\u6578\uff0c\u5169\u500b Class \u90fd\u662f\u5f9e Numeric object \u7e7c\u627f\u800c\u4f86\uff1a<\/p>\n","protected":false},"author":1,"featured_media":2645,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[184,90],"tags":[194],"_links":{"self":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/2642"}],"collection":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/comments?post=2642"}],"version-history":[{"count":4,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/2642\/revisions"}],"predecessor-version":[{"id":2662,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/2642\/revisions\/2662"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/media\/2645"}],"wp:attachment":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/media?parent=2642"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/categories?post=2642"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/tags?post=2642"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}