{"id":15393,"date":"2024-11-17T20:50:21","date_gmt":"2024-11-17T12:50:21","guid":{"rendered":"https:\/\/fwq.ai\/blog\/?p=15393"},"modified":"2024-11-17T20:50:21","modified_gmt":"2024-11-17T12:50:21","slug":"float%e4%b8%8edouble%e7%9a%84%e8%8c%83%e5%9b%b4%e5%92%8c%e7%b2%be%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/15393\/","title":{"rendered":"float\u4e0edouble\u7684\u8303\u56f4\u548c\u7cbe\u5ea6"},"content":{"rendered":"

\u4e00\u3001\u8303\u56f4<\/h1>\n

float\u00a0<\/strong>\u548c\u00a0double<\/strong>\u00a0\u7684\u8303\u56f4\u662f\u7531\u6307\u6570\u7684\u4f4d\u6570\u6765\u51b3\u5b9a\u7684\u3002
\nfloat<\/strong>\u00a0\u7684\u6307\u6570\u4f4d\u67098\u4f4d\uff0c\u800c\u00a0double<\/strong>\u00a0\u7684\u6307\u6570\u4f4d\u670911\u4f4d\uff0c\u5206\u5e03\u5982\u4e0b\uff1a<\/p>\n

float<\/strong>\uff1a<\/p>\n\n\n\n
1bit\uff08\u7b26\u53f7\u4f4d\uff09<\/td>\n\u00a08bits\uff08\u6307\u6570\u4f4d\uff09<\/td>\n\u00a023bits\uff08\u5c3e\u6570\u4f4d\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

double<\/strong>\uff1a<\/p>\n\n\n\n
\u00a01bit\uff08\u7b26\u53f7\u4f4d\uff09<\/td>\n\u00a011bits\uff08\u6307\u6570\u4f4d\uff09<\/td>\n\u00a052bits\uff08\u5c3e\u6570\u4f4d\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u4e8e\u662f\uff0cfloat<\/strong>\u00a0\u7684\u6307\u6570\u8303\u56f4\u4e3a-127~+128\uff0c\u800c\u00a0double<\/strong>\u00a0\u7684\u6307\u6570\u8303\u56f4\u4e3a-1023~+1024\uff0c\u5e76\u4e14\u6307\u6570\u4f4d\u662f\u6309\u8865\u7801\u7684\u5f62\u5f0f\u6765\u5212\u5206\u7684\u3002\u5176\u4e2d\u8d1f\u6307\u6570\u51b3\u5b9a\u4e86\u6d6e\u70b9\u6570\u6240\u80fd\u8868\u8fbe\u7684\u7edd\u5bf9\u503c\u6700\u5c0f\u7684\u975e\u96f6\u6570\uff1b\u800c\u6b63\u6307\u6570\u51b3\u5b9a\u4e86\u6d6e\u70b9\u6570\u6240\u80fd\u8868\u8fbe\u7684\u7edd\u5bf9\u503c\u6700\u5927\u7684\u6570\uff0c\u4e5f\u5373\u51b3\u5b9a\u4e86\u6d6e\u70b9\u6570\u7684\u53d6\u503c\u8303\u56f4\u3002
\nfloat<\/strong>\u00a0\u7684\u8303\u56f4\u4e3a-2^128 ~ +2^128\uff0c\u4e5f\u5373-3.40E+38 ~ +3.40E+38\uff1bdouble<\/strong>\u00a0\u7684\u8303\u56f4\u4e3a-2^1024 ~ +2^1024\uff0c\u4e5f\u5373-1.79E+308 ~ +1.79E+308\u3002<\/p>\n

\u4e8c\u3001\u7cbe\u5ea6<\/h1>\n

float<\/strong>\u00a0\u548c\u00a0double<\/strong>\u00a0\u7684\u7cbe\u5ea6\u662f\u7531\u5c3e\u6570\u7684\u4f4d\u6570\u6765\u51b3\u5b9a\u7684\u3002\u6d6e\u70b9\u6570\u5728\u5185\u5b58\u4e2d\u662f\u6309\u79d1\u5b66\u8ba1\u6570\u6cd5\u6765\u5b58\u50a8\u7684\uff0c\u5176\u6574\u6570\u90e8\u5206\u59cb\u7ec8\u662f\u4e00\u4e2a\u9690\u542b\u7740\u7684\u201c1\u201d\uff0c\u7531\u4e8e\u5b83\u662f\u4e0d\u53d8\u7684\uff0c\u6545\u4e0d\u80fd\u5bf9\u7cbe\u5ea6\u9020\u6210\u5f71\u54cd\u3002<\/p>\n

float<\/strong>\uff1a2^23 = 8388608\uff0c\u4e00\u5171\u4e03\u4f4d\uff0c\u8fd9\u610f\u5473\u7740\u6700\u591a\u80fd\u67097\u4f4d\u6709\u6548\u6570\u5b57\uff0c\u4f46\u7edd\u5bf9\u80fd\u4fdd\u8bc1\u7684\u4e3a6\u4f4d\uff0c\u4e5f\u5373float\u7684\u7cbe\u5ea6\u4e3a6~7\u4f4d\u6709\u6548\u6570\u5b57\uff1b<\/p>\n

double<\/strong>\uff1a2^52 = 4503599627370496\uff0c\u4e00\u517116\u4f4d\uff0c\u540c\u7406\uff0cdouble\u7684\u7cbe\u5ea6\u4e3a15~16\u4f4d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e00\u3001\u8303\u56f4 float\u00a0\u548c\u00a0double\u00a0\u7684\u8303\u56f4\u662f\u7531\u6307\u6570\u7684\u4f4d\u6570\u6765\u51b3\u5b9a\u7684\u3002 float\u00a0\u7684\u6307\u6570\u4f4d\u67098\u4f4d\uff0c\u800c\u00a0double\u00a0\u7684\u6307\u6570\u4f4d\u670911\u4f4d\uff0c\u5206\u5e03\u5982\u4e0b\uff1a float\uff1a 1bit\uff08\u7b26\u53f7\u4f4d\uff09 \u00a08bits\uff08\u6307\u6570\u4f4d\uff09 \u00a023bits\uff08\u5c3e\u6570\u4f4d\uff09 double\uff1a \u00a01bit\uff08\u7b26\u53f7\u4f4d\uff09 \u00a011bits\uff08\u6307\u6570\u4f4d\uff09 \u00a052bits\uff08\u5c3e\u6570\u4f4d\uff09   \u4e8e\u662f\uff0cfloat\u00a0\u7684\u6307\u6570\u8303\u56f4\u4e3a-127~+128\uff0c\u800c\u00a0double\u00a0\u7684\u6307\u6570\u8303\u56f4\u4e3a-1023~+1024\uff0c\u5e76\u4e14\u6307\u6570\u4f4d\u662f\u6309\u8865\u7801\u7684\u5f62\u5f0f\u6765\u5212\u5206\u7684\u3002\u5176\u4e2d\u8d1f\u6307\u6570\u51b3\u5b9a\u4e86\u6d6e\u70b9\u6570\u6240\u80fd\u8868\u8fbe\u7684\u7edd\u5bf9\u503c\u6700\u5c0f\u7684\u975e\u96f6\u6570\uff1b\u800c\u6b63\u6307\u6570\u51b3\u5b9a\u4e86\u6d6e\u70b9\u6570\u6240\u80fd\u8868\u8fbe\u7684\u7edd\u5bf9\u503c\u6700\u5927\u7684\u6570\uff0c\u4e5f\u5373\u51b3\u5b9a\u4e86\u6d6e\u70b9\u6570\u7684\u53d6\u503c\u8303\u56f4\u3002 float\u00a0\u7684\u8303\u56f4\u4e3a-2^128 ~ +2^128\uff0c\u4e5f\u5373-3.40E+38 ~ +3.40E+38\uff1bdouble\u00a0\u7684\u8303\u56f4\u4e3a-2^1024 ~ +2^1024\uff0c\u4e5f\u5373-1.79E+308 ~ +1.79E+308\u3002 \u4e8c\u3001\u7cbe\u5ea6 float\u00a0\u548c\u00a0double\u00a0\u7684\u7cbe\u5ea6\u662f\u7531\u5c3e\u6570\u7684\u4f4d\u6570\u6765\u51b3\u5b9a\u7684\u3002\u6d6e\u70b9\u6570\u5728\u5185\u5b58\u4e2d\u662f\u6309\u79d1\u5b66\u8ba1\u6570\u6cd5\u6765\u5b58\u50a8\u7684\uff0c\u5176\u6574\u6570\u90e8\u5206\u59cb\u7ec8\u662f\u4e00\u4e2a\u9690\u542b\u7740\u7684\u201c1\u201d\uff0c\u7531\u4e8e\u5b83\u662f\u4e0d\u53d8\u7684\uff0c\u6545\u4e0d\u80fd\u5bf9\u7cbe\u5ea6\u9020\u6210\u5f71\u54cd\u3002 float\uff1a2^23 = 8388608\uff0c\u4e00\u5171\u4e03\u4f4d\uff0c\u8fd9\u610f\u5473\u7740\u6700\u591a\u80fd\u67097\u4f4d\u6709\u6548\u6570\u5b57\uff0c\u4f46\u7edd\u5bf9\u80fd\u4fdd\u8bc1\u7684\u4e3a6\u4f4d\uff0c\u4e5f\u5373float\u7684\u7cbe\u5ea6\u4e3a6~7\u4f4d\u6709\u6548\u6570\u5b57\uff1b double\uff1a2^52 = 4503599627370496\uff0c\u4e00\u517116\u4f4d\uff0c\u540c\u7406\uff0cdouble\u7684\u7cbe\u5ea6\u4e3a15~16\u4f4d\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-15393","post","type-post","status-publish","format-standard","hentry","category-docker"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/15393","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=15393"}],"version-history":[{"count":1,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/15393\/revisions"}],"predecessor-version":[{"id":15394,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/15393\/revisions\/15394"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=15393"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=15393"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=15393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}