{"id":3265,"date":"2025-03-29T15:02:42","date_gmt":"2025-03-29T07:02:42","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3265"},"modified":"2025-03-29T15:02:42","modified_gmt":"2025-03-29T07:02:42","slug":"c-%e6%95%b0%e5%ad%97","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/29\/c-%e6%95%b0%e5%ad%97\/","title":{"rendered":"C++ \u6570\u5b57"},"content":{"rendered":"\n<p>\u5728 C++ \u4e2d\uff0c<strong>\u6570\u5b57<\/strong>\u4e3b\u8981\u6d89\u53ca <strong>\u6574\u6570\uff08integer\uff09<\/strong> \u548c <strong>\u6d6e\u70b9\u6570\uff08floating-point number\uff09<\/strong>\uff0c\u5b83\u4eec\u5bf9\u5e94\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\u3002\u4e0b\u9762\u662f\u5173\u4e8e C++ \u6570\u5b57\u7684\u5168\u9762\u89e3\u8bfb\uff0c\u5305\u62ec\u57fa\u7840\u6982\u5ff5\u3001\u6570\u636e\u7c7b\u578b\u3001\u64cd\u4f5c\u3001\u8fdb\u5236\u8868\u793a\u3001\u7c7b\u578b\u8f6c\u6362\u3001\u6570\u5b66\u51fd\u6570\u7b49\u5185\u5bb9\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. C++ \u6570\u5b57\u7684\u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n<p>C++ \u63d0\u4f9b\u4e86\u591a\u4e2a\u7528\u4e8e\u5b58\u50a8\u6570\u5b57\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u4e3b\u8981\u5206\u4e3a <strong>\u6574\u6570\u7c7b\u578b<\/strong> \u548c <strong>\u6d6e\u70b9\u6570\u7c7b\u578b<\/strong>\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.1 \u6574\u6570\u7c7b\u578b\uff08Integer Types\uff09<\/h3>\n\n\n\n<p>\u6574\u6570\u7c7b\u578b\u7528\u4e8e\u5b58\u50a8 <strong>\u6ca1\u6709\u5c0f\u6570\u90e8\u5206\u7684\u6570\u5b57<\/strong>\uff0c\u5e38\u89c1\u7684\u6574\u6570\u7c7b\u578b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7c7b\u578b<\/th><th>\u5927\u5c0f\uff08\u4f4d\uff09<\/th><th>\u53d6\u503c\u8303\u56f4\uff08\u5e26\u7b26\u53f7\uff09<\/th><th>\u53d6\u503c\u8303\u56f4\uff08\u65e0\u7b26\u53f7\uff09<\/th><\/tr><\/thead><tbody><tr><td><code>short<\/code><\/td><td>\u901a\u5e38 16<\/td><td>-32,768 ~ 32,767<\/td><td>0 ~ 65,535<\/td><\/tr><tr><td><code>int<\/code><\/td><td>\u901a\u5e38 32<\/td><td>-2,147,483,648 ~ 2,147,483,647<\/td><td>0 ~ 4,294,967,295<\/td><\/tr><tr><td><code>long<\/code><\/td><td>\u901a\u5e38 32 \u6216 64<\/td><td>-2,147,483,648 ~ 2,147,483,647 (32\u4f4d)<\/td><td>0 ~ 4,294,967,295<\/td><\/tr><tr><td><code>long long<\/code><\/td><td>\u901a\u5e38 64<\/td><td>-9,223,372,036,854,775,808 ~ 9,223,372,036,854,775,807<\/td><td>0 ~ 18,446,744,073,709,551,615<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>\u65e0\u7b26\u53f7\u6574\u6570<\/strong>\uff08<code>unsigned<\/code>\uff09\u4e0d\u5141\u8bb8\u8d1f\u6570\uff0c\u5b83\u7684\u6700\u5927\u503c\u6bd4\u5e26\u7b26\u53f7\u6574\u6570\u591a\u4e00\u500d\u3002\u4f8b\u5982\uff0c<code>unsigned int<\/code> \u7684\u8303\u56f4\u662f <code>0 ~ 4,294,967,295<\/code>\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int a = 10;             \/\/ \u666e\u901a\u6574\u6570\n    unsigned int b = 20;    \/\/ \u65e0\u7b26\u53f7\u6574\u6570\n    long c = 100000L;       \/\/ \u957f\u6574\u6570\n    long long d = 123456789012345LL; \/\/ \u8d85\u957f\u6574\u6570\n\n    cout &lt;&lt; \"a: \" &lt;&lt; a &lt;&lt; endl;\n    cout &lt;&lt; \"b: \" &lt;&lt; b &lt;&lt; endl;\n    cout &lt;&lt; \"c: \" &lt;&lt; c &lt;&lt; endl;\n    cout &lt;&lt; \"d: \" &lt;&lt; d &lt;&lt; endl;\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1.2 \u6d6e\u70b9\u6570\u7c7b\u578b\uff08Floating-point Types\uff09<\/h3>\n\n\n\n<p>\u6d6e\u70b9\u6570\u7528\u4e8e\u8868\u793a\u5e26\u5c0f\u6570\u7684\u6570\u5b57\uff0c\u4e3b\u8981\u7c7b\u578b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7c7b\u578b<\/th><th>\u5927\u5c0f\uff08\u4f4d\uff09<\/th><th>\u7cbe\u5ea6\uff08\u6709\u6548\u4f4d\u6570\uff09<\/th><th>\u53d6\u503c\u8303\u56f4<\/th><\/tr><\/thead><tbody><tr><td><code>float<\/code><\/td><td>\u901a\u5e38 32<\/td><td>7 \u4f4d<\/td><td>\u7ea6 3.4E-38 ~ 3.4E+38<\/td><\/tr><tr><td><code>double<\/code><\/td><td>\u901a\u5e38 64<\/td><td>15 \u4f4d<\/td><td>\u7ea6 1.7E-308 ~ 1.7E+308<\/td><\/tr><tr><td><code>long double<\/code><\/td><td>\u901a\u5e38 80\/128<\/td><td>18+ \u4f4d<\/td><td>\u53d6\u51b3\u4e8e\u5b9e\u73b0\uff08\u901a\u5e38\u6bd4 <code>double<\/code> \u7cbe\u786e\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    float a = 3.14f;       \/\/ \u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\n    double b = 3.1415926;  \/\/ \u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\n    long double c = 2.718281828L; \/\/ \u957f\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\n\n    cout &lt;&lt; \"float a: \" &lt;&lt; a &lt;&lt; endl;\n    cout &lt;&lt; \"double b: \" &lt;&lt; b &lt;&lt; endl;\n    cout &lt;&lt; \"long double c: \" &lt;&lt; c &lt;&lt; endl;\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u8fdb\u5236\u8868\u793a\uff08Binary, Octal, Hexadecimal\uff09<\/h2>\n\n\n\n<p>C++ \u5141\u8bb8\u4e0d\u540c\u8fdb\u5236\u7684\u6570\u503c\u8868\u793a\uff0c\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5341\u8fdb\u5236<\/strong>\uff08\u9ed8\u8ba4\uff09<code>10<\/code><\/li>\n\n\n\n<li><strong>\u4e8c\u8fdb\u5236<\/strong>\uff08<code>0b<\/code> \u524d\u7f00\uff09<code>0b1010<\/code><\/li>\n\n\n\n<li><strong>\u516b\u8fdb\u5236<\/strong>\uff08<code>0<\/code> \u524d\u7f00\uff09<code>012<\/code><\/li>\n\n\n\n<li><strong>\u5341\u516d\u8fdb\u5236<\/strong>\uff08<code>0x<\/code> \u524d\u7f00\uff09<code>0xA<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int dec = 10;     \/\/ \u5341\u8fdb\u5236\n    int bin = 0b1010; \/\/ \u4e8c\u8fdb\u5236\n    int oct = 012;    \/\/ \u516b\u8fdb\u5236\n    int hex = 0xA;    \/\/ \u5341\u516d\u8fdb\u5236\n\n    cout &lt;&lt; \"Decimal: \" &lt;&lt; dec &lt;&lt; endl;\n    cout &lt;&lt; \"Binary: \" &lt;&lt; bin &lt;&lt; endl;\n    cout &lt;&lt; \"Octal: \" &lt;&lt; oct &lt;&lt; endl;\n    cout &lt;&lt; \"Hexadecimal: \" &lt;&lt; hex &lt;&lt; endl;\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u7c7b\u578b\u8f6c\u6362\uff08Type Conversion\uff09<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 \u9690\u5f0f\u8f6c\u6362\uff08\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\uff09<\/h3>\n\n\n\n<p>C++ \u4f1a\u5728\u4e0d\u540c\u7c7b\u578b\u95f4\u81ea\u52a8\u8f6c\u6362\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>double x = 10; \/\/ int \u8f6c double<\/code><\/pre>\n\n\n\n<p>\u4f46\u9700\u8981\u6ce8\u610f <strong>\u7cbe\u5ea6\u4e22\u5931<\/strong> \u548c <strong>\u6ea2\u51fa\u95ee\u9898<\/strong>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 \u663e\u5f0f\u8f6c\u6362\uff08\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff09<\/h3>\n\n\n\n<p>\u4f7f\u7528 <strong>C \u98ce\u683c<\/strong> \u6216 <strong>C++ <code>static_cast<\/code><\/strong> \u8fdb\u884c\u8f6c\u6362\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int a = 10;\ndouble b = (double)a; \/\/ C \u98ce\u683c\ndouble c = static_cast&lt;double&gt;(a); \/\/ C++ \u98ce\u683c<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u6570\u5b66\u8fd0\u7b97\u4e0e\u5e93\u51fd\u6570<\/h2>\n\n\n\n<p>C++ \u63d0\u4f9b\u4e86 <strong>\u6570\u5b66\u8fd0\u7b97\u7b26<\/strong> \u548c <strong>\u6570\u5b66\u5e93\u51fd\u6570\uff08<code>&lt;cmath&gt;<\/code> \u5934\u6587\u4ef6\uff09<\/strong> \u8fdb\u884c\u6570\u503c\u8ba1\u7b97\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 \u5e38\u89c1\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u8fd0\u7b97\u7b26<\/th><th>\u63cf\u8ff0<\/th><th>\u793a\u4f8b<\/th><\/tr><\/thead><tbody><tr><td><code>+<\/code><\/td><td>\u52a0<\/td><td><code>a + b<\/code><\/td><\/tr><tr><td><code>-<\/code><\/td><td>\u51cf<\/td><td><code>a - b<\/code><\/td><\/tr><tr><td><code>*<\/code><\/td><td>\u4e58<\/td><td><code>a * b<\/code><\/td><\/tr><tr><td><code>\/<\/code><\/td><td>\u9664<\/td><td><code>a \/ b<\/code><\/td><\/tr><tr><td><code>%<\/code><\/td><td>\u53d6\u6a21<\/td><td><code>a % b<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">4.2 \u5e38\u89c1\u6570\u5b66\u51fd\u6570<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u51fd\u6570<\/th><th>\u63cf\u8ff0<\/th><th>\u793a\u4f8b<\/th><\/tr><\/thead><tbody><tr><td><code>sqrt(x)<\/code><\/td><td>\u5f00\u5e73\u65b9<\/td><td><code>sqrt(9) \u2192 3<\/code><\/td><\/tr><tr><td><code>pow(x, y)<\/code><\/td><td>\u5e42\u8fd0\u7b97<\/td><td><code>pow(2, 3) \u2192 8<\/code><\/td><\/tr><tr><td><code>abs(x)<\/code><\/td><td>\u7edd\u5bf9\u503c<\/td><td><code>abs(-5) \u2192 5<\/code><\/td><\/tr><tr><td><code>floor(x)<\/code><\/td><td>\u5411\u4e0b\u53d6\u6574<\/td><td><code>floor(3.7) \u2192 3<\/code><\/td><\/tr><tr><td><code>ceil(x)<\/code><\/td><td>\u5411\u4e0a\u53d6\u6574<\/td><td><code>ceil(3.2) \u2192 4<\/code><\/td><\/tr><tr><td><code>round(x)<\/code><\/td><td>\u56db\u820d\u4e94\u5165<\/td><td><code>round(3.5) \u2192 4<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\n#include &lt;cmath&gt;\nusing namespace std;\n\nint main() {\n    cout &lt;&lt; \"sqrt(16): \" &lt;&lt; sqrt(16) &lt;&lt; endl;\n    cout &lt;&lt; \"pow(2, 3): \" &lt;&lt; pow(2, 3) &lt;&lt; endl;\n    cout &lt;&lt; \"abs(-10): \" &lt;&lt; abs(-10) &lt;&lt; endl;\n    cout &lt;&lt; \"floor(3.7): \" &lt;&lt; floor(3.7) &lt;&lt; endl;\n    cout &lt;&lt; \"ceil(3.2): \" &lt;&lt; ceil(3.2) &lt;&lt; endl;\n    cout &lt;&lt; \"round(3.5): \" &lt;&lt; round(3.5) &lt;&lt; endl;\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. \u53c2\u8003\u94fe\u63a5<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/en.cppreference.com\/\">C++ \u5b98\u65b9\u6587\u6863<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cplusplus.com\/reference\/cmath\/\">C++ <code>&lt;cmath><\/code> \u6570\u5b66\u5e93\u51fd\u6570<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 C++ \u4e2d\uff0c\u6570\u5b57\u4e3b\u8981\u6d89\u53ca \u6574\u6570\uff08integer\uff09 \u548c \u6d6e\u70b9\u6570\uff08floating-point number\uff09 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3266,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[81],"tags":[],"class_list":["post-3265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3265","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3265"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3265\/revisions"}],"predecessor-version":[{"id":3267,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3265\/revisions\/3267"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3266"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}