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C ++中的copysign ()函数接受两个参数，并返回一个值，该值具有第一个参数的大小和第二个参数的符号。 该函数在 <cmath> 头文件中定义。 float copysign(float x, float y); long double copysign(long double x, long double y); Promoted copysign(Type1 x, Type2 y); // Additional overloads for arithmetic types. 从C ++ 11开始，如果传递给copysign ()的参数为long double，则返回类型Promoted为long double。 如果不是，则返回类型Promoted为double。

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若无错误发生，则返回以 x 的模与 y 的符号组成的浮点值。 若 x 为 NaN ，则返回带 y 符号的 NaN 。 若 y 为 -0 ，则仅若实现支持与算术运算一致的有符号零，结果才为负。 此函数不受制于任何指定于 math_errhandling 的错误. 若实现支持 IEEE 浮点算术（ IEC 60559 ），则. 返回值是准确的（决不引发 FE_INEXACT ）且独立于当前 舍入模式。

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An Imp is a mythological being similar to a fairy or fiend, frequently described in folklore and superstition. The word may perhaps derive from the term ympe, used to denote a young grafted tree. Imps are often described as mischievous more than …

The Imp is Dreams' fully customisable cursor with an expressive face that changes expressions using the touchpad on the Dualshock 4. When starting a new game, players have several different pre-made Imp shapes and colors to choose from as …