{"id":160,"date":"2026-01-04T14:37:01","date_gmt":"2026-01-04T06:37:01","guid":{"rendered":"https:\/\/www.codercat.site\/?p=160"},"modified":"2026-01-04T15:53:24","modified_gmt":"2026-01-04T07:53:24","slug":"%e7%a8%8b%e8%ae%be%e6%9c%9f%e6%9c%ab%e5%a4%8d%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/www.codercat.site\/index.php\/2026\/01\/04\/%e7%a8%8b%e8%ae%be%e6%9c%9f%e6%9c%ab%e5%a4%8d%e4%b9%a0\/","title":{"rendered":"\u7a0b\u8bbe\u671f\u672b\u590d\u4e60"},"content":{"rendered":"\n<p>\u6807\u8bc6\u7b26 identifier<br>An identifier must start with a letter or an underscore. It cannot start with a digit.<br>assignment statement\u8d4b\u503c\u8bed\u53e5<\/p>\n\n\n\n<p><br><strong>Numerical Data Types and Operations<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"585\"   class=\"lazyload\" data-src=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-1024x585.png\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\" class=\"wp-image-161\" srcset=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-1024x585.png 1024w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-300x172.png 300w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-768x439.png 768w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image.png 1165w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure >\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"585\" src=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-1024x585.png\" alt=\"\" class=\"wp-image-161\" srcset=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-1024x585.png 1024w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-300x172.png 300w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-768x439.png 768w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image.png 1165w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/noscript>\n\n\n\n<p>A constant must be declared and initialized in the same statement.<\/p>\n\n\n\n<p>overflow underflow<\/p>\n\n\n\n<p>%remainder *subtraction *multiplication<br>5 \/ 2 yields an integer 2.<br>5.0 \/ 2 yields a double value 2.5<\/p>\n\n\n\n<p>cout &lt;&lt; \"Interest is:\" &lt;&lt;fixed&lt;&lt;setprecision(2)&lt;&lt;interest&lt;&lt;endl;<br>Interest is: 16.40<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"597\"   class=\"lazyload\" data-src=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3-1024x597.png\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\" class=\"wp-image-165\" srcset=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3-1024x597.png 1024w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3-300x175.png 300w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3-768x448.png 768w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3.png 1184w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure >\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"597\" src=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3-1024x597.png\" alt=\"\" class=\"wp-image-165\" srcset=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3-1024x597.png 1024w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3-300x175.png 300w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3-768x448.png 768w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-3.png 1184w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/noscript>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Operator Name<br>! not logical negation<br>&amp;&amp; and logical conjunciton<br>|| or logical disjunction<\/p>\n<\/blockquote>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"656\"   class=\"lazyload\" data-src=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4-1024x656.png\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\" class=\"wp-image-167\" srcset=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4-1024x656.png 1024w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4-300x192.png 300w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4-768x492.png 768w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4.png 1196w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure >\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"656\" src=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4-1024x656.png\" alt=\"\" class=\"wp-image-167\" srcset=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4-1024x656.png 1024w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4-300x192.png 300w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4-768x492.png 768w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-4.png 1196w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"641\"   class=\"lazyload\" data-src=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5-1024x641.png\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\" class=\"wp-image-170\" srcset=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5-1024x641.png 1024w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5-300x188.png 300w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5-768x481.png 768w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5.png 1333w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure >\n<noscript><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"641\" src=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5-1024x641.png\" alt=\"\" class=\"wp-image-170\" srcset=\"https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5-1024x641.png 1024w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5-300x188.png 300w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5-768x481.png 768w, https:\/\/www.codercat.site\/wp-content\/uploads\/2026\/01\/image-5.png 1333w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/noscript>\n\n\n\n<p>\u8f93\u5165\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>string sentence;getline(cin, sentence);\ncout &lt;&lt; \"Interest is:\" &lt;&lt;fixed&lt;&lt;setprecision(2)&lt;&lt;interest&lt;&lt;endl;<\/code><\/pre>\n\n\n\n<p>\u5b57\u7b26\u4e32<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>string s1 = \"Hello\";\nstring s2 = \"Hi\";\nint result = s1.compare(s2);\n\nstring s = \"programming\";cout &lt;&lt; s.substr(0, 3) &lt;&lt; endl;   \/\/ \"pro\"\ncout &lt;&lt; s.substr(3, 4) &lt;&lt; endl;   \/\/ \"gram\"\ncout &lt;&lt; s.substr(7) &lt;&lt; endl;      \/\/ \"ming\"<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>string s = \"Welcome to C++ programming\";\ncout &lt;&lt; s.find(\"come\") &lt;&lt; endl; \/\/ 3\ncout &lt;&lt; s.find('o') &lt;&lt; endl; \/\/ 4\ncout &lt;&lt; s.find(\"Java\") &lt;&lt; endl; \/\/ string::npos (not found)\ncout &lt;&lt; s.find(\"o\", 5)&lt;&lt; endl; \/\/ search from index 5 onward<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u64cd\u4f5c<\/strong><\/td><td><strong>\u793a\u4f8b\u4ee3\u7801<\/strong><\/td><td><strong>\u8bf4\u660e<\/strong><\/td><\/tr><tr><td>\u62fc\u63a5<\/td><td>s3&nbsp;=&nbsp;s1&nbsp;+&nbsp;s2;<\/td><td>\u5408\u5e76\u4e24\u4e2a\u5b57\u7b26\u4e32<\/td><\/tr><tr><td>\u8ffd\u52a0<\/td><td>s1&nbsp;+=&nbsp;\"!\";<\/td><td>\u5728\u672b\u5c3e\u8ffd\u52a0\u5185\u5bb9<\/td><\/tr><tr><td>\u957f\u5ea6<\/td><td>s1.length()&nbsp;\/&nbsp;s1.size()<\/td><td>\u8fd4\u56de\u5b57\u7b26\u6570<\/td><\/tr><tr><td>\u6e05\u7a7a<\/td><td>s1.clear()<\/td><td>\u53d8\u4e3a\u7a7a\u5b57\u7b26\u4e32<\/td><\/tr><tr><td>\u5224\u65ad\u7a7a<\/td><td>s1.empty()<\/td><td>\u8fd4\u56detrue\u6216false<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>When a function contains a mixture of parameters with and without default values, those with default values must be declared last.<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6807\u8bc6\u7b26 identifierAn identifier must start with a letter or an unders &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-160","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/posts\/160","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/comments?post=160"}],"version-history":[{"count":11,"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/posts\/160\/revisions"}],"predecessor-version":[{"id":178,"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/posts\/160\/revisions\/178"}],"wp:attachment":[{"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/media?parent=160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/categories?post=160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codercat.site\/index.php\/wp-json\/wp\/v2\/tags?post=160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}