[C&C++] 浮點數精準度 (Floating-Point Precision)
很多程式設計師都會有浮點數精準度 (Floating-Point Precision)的問題，但常常只知道double的精準度大於float，卻不知道double精準度多少，也不知道float精準度多少，反正就用精準度最大的double就好。但其實原理很簡單，計算機概論中就有提到IEEE 754對浮點數的規範，只要稍微瞭解一下其定義即可。
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