编程如何给定一个精度

Ⅰ c++中单双精度再编程中怎样确定简单通俗的来。

简单来说，单精度(single precision)浮点数精度比双精度(double precision)浮点数范围小，精度低，前者十进制有效数字7~8位，后者十进制有效数字14~15位。一般是指IEC-559/IEEE-754标准定义的二进制浮点数。
1L和2L错误，C++中有三种浮点数float、double和long double，精度（包括范围）float<=double<=long double，具体精度由实现定义。一般实现中， float即为单精度浮点数，double即为双精度浮点数。
单精度精度相对比较小，但相对来说比较快，只是在PC上有硬件浮点运算器实现时相差可能相对不明显。对于性能较低（嵌入式设备）或效率要求很高的场合（例如字形渲染），应该尽可能自定义的定点数代替浮点数，即使因为复杂性等原因而不得不用浮点数，也尽可能用单精度代替双精度（除非精度要求很高或者范围很大float放不下）。而其它情况下（效率要求一般的数值计算），用double代替float可以少关心一些精度问题。
另外，long double是长双精度(long double)浮点数，往往用软件实现（CPU中的FPU可能只支持80位二进制浮点数，不能实现长双精度浮点数的计算），可能会显著慢于float和double运算。
注意，C++中默认不加后缀的浮点常数字面量表示是double类型，加后缀f或F是float，l是double，L是long double。
浮点数算术表达式中如果有不同精度的运算数，整数会转换为浮点数，低精度运算数会隐式地转换为高精度运算数。

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鍦ㄨ緭鍑烘椂
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Ⅲ 鎴戠殑AI璇曢獙绮惧害瀹氫箟

鎴戠殑AI璇曢獙绮惧害瀹氫箟

绮惧害瀹氫箟绡

Accuracy measure - 鍑嗙‘搴︽祴閲

Correctness assessment - 姝ｇ‘鎬ц瘎浼

Degree of exactness - 绮剧‘绋嬪害

Precision vs. recall - 绮惧害涓庡彫鍥炵巼

Consistency of measurements - 娴嬮噺鐨勪竴鑷存

Error margin - 璇宸鑼冨洿

Reliability of data - 鏁版嵁鐨勫彲闈犳

Precision in scientific research - 绉戝︾爺绌朵腑鐨勭簿纭搴

Statistical precision - 缁熻＄簿纭搴

Precision engineering - 绮惧瘑宸ョ▼

Precision medicine - 绮惧噯鍖诲

Precision manufacturing - 绮惧瘑鍒堕

Precision agriculture - 绮惧噯鍐滀笟

Precision tools - 绮惧瘑宸ュ叿

Precision cutting - 绮剧‘鍒囧壊

Precision measurement instruments - 绮惧瘑娴嬮噺浠鍣

Precision optics - 绮惧瘑鍏夊

Precision mechanics - 绮惧瘑鏈烘

Precision machining - 绮惧瘑鍔犲伐

Precision control systems - 绮惧瘑鎺у埗绯荤粺

Precision in data analysis - 鏁版嵁鍒嗘瀽涓鐨勭簿纭搴

Precision in financial forecasting - 閲戣瀺棰勬祴涓鐨勭簿纭搴

Precision in weather prediction - 澶╂皵棰勬姤涓鐨勭簿纭搴

Precision in navigation systems - 瀵艰埅绯荤粺涓鐨勭簿纭搴

Precision in GPS technology - GPS鎶鏈涓鐨勭簿纭搴

Precision in medical diagnostics - 鍖诲﹁瘖鏂涓鐨勭簿纭搴

Precision in DNA sequencing - DNA娴嬪簭涓鐨勭簿纭搴

Precision in drug delivery - 鑽鐗╄緭閫佷腑鐨勭簿纭搴

Precision in surgical proceres - 鎵嬫湳绋嬪簭涓鐨勭簿纭搴

Precision in robotics - 鏈哄櫒浜烘妧鏈涓鐨勭簿纭搴

Precision in artificial intelligence - 浜哄伐鏅鸿兘涓鐨勭簿纭搴

Precision in computer programming - 璁＄畻鏈虹紪绋嬩腑鐨勭簿纭搴

Precision in language translation - 璇瑷缈昏瘧涓鐨勭簿纭搴

Precision in image recognition - 鍥惧儚璇嗗埆涓鐨勭簿纭搴

Precision in speech synthesis - 璇闊冲悎鎴愪腑鐨勭簿纭搴

Precision in sentiment analysis - 鎯呮劅鍒嗘瀽涓鐨勭簿纭搴

Precision in recommendation systems - 鎺ㄨ崘绯荤粺涓鐨勭簿纭搴

Precision in fraud detection - 娆鸿瘓妫娴嬩腑鐨勭簿纭搴

Precision in customer segmentation - 瀹㈡埛缁嗗垎涓鐨勭簿纭搴

Precision in market research - 甯傚満鐮旂┒涓鐨勭簿纭搴

Precision in risk assessment - 椋庨櫓璇勪及涓鐨勭簿纭搴

Precision in decision making - 鍐崇瓥涓鐨勭簿纭搴

Precision in project management - 椤圭洰绠＄悊涓鐨勭簿纭搴

Precision in time management - 鏃堕棿绠＄悊涓鐨勭簿纭搴

Precision in communication - 娌熼氫腑鐨勭簿纭搴

Precision in problem-solving - 瑙ｅ喅闂棰樹腑鐨勭簿纭搴

Precision in interpersonal relationships - 浜洪檯鍏崇郴涓鐨勭簿纭搴

Precision in creative expression - 鍒涢犳ц〃杈句腑鐨勭簿纭搴

Precision in athletic performance - 杩愬姩琛ㄧ幇涓鐨勭簿纭搴

Precision in musical composition - 闊充箰鍒涗綔涓鐨勭簿纭搴

Precision in artistic techniques - 鑹烘湳鎶宸т腑鐨勭簿纭搴

Precision in dance movements - 鑸炶箞鍔ㄤ綔涓鐨勭簿纭搴

Precision in culinary skills - 鐑归オ鎶宸т腑鐨勭簿纭搴

Precision in fashion design - 鏃惰呰捐′腑鐨勭簿纭搴

Precision in interior decoration - 瀹ゅ唴瑁呴グ涓鐨勭簿纭搴

Precision in architectural drawings - 寤虹瓚缁樺浘涓鐨勭簿纭搴

Precision in photography - 鎽勫奖涓鐨勭簿纭搴

Precision in painting techniques - 缁樼敾鎶宸т腑鐨勭簿纭搴

Precision in calligraphy strokes - 涔︽硶绗旂敾涓鐨勭簿纭搴

Precision in pottery shaping - 闄惰壓閫犲瀷涓鐨勭簿纭搴