std::frexp

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Defined in header <cmath>
float       frexp( float arg, int* exp );
double      frexp( double arg, int* exp );
long double frexp( long double arg, int* exp );
double      frexp( Integral arg, int* exp );
 （C++11 起）
分解浮点值尾数和指数.
Original:
Decomposes given floating point value to significand and exponent.
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[编辑] 参数

arg -
浮点值
Original:
floating point value
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exp -
为整数值的指针存储的指数
Original:
pointer to integer value to store the exponent to
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[编辑] 返回值

有效位[0.5; 1)的范围内的给定的浮点数。该指数是把整数值指出，exp.
Original:
significand of the given floating point number in the range of [0.5; 1). The exponent is put into integer value pointed to by exp.
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[编辑] 另请参阅
2次方乘以一个数
Original:
multiplies a number by 2 raised to a power
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（函数） [edit]
（C++11）
提取指数的数量
Original:
extracts exponent of the number
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（函数） [edit]
（C++11）
提取指数的数量
Original:
extracts exponent of the number
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（函数） [edit]
分解一个数字的整数部分和小数部分
Original:
decomposes a number into integer and fractional parts
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（函数） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/math/frexp&oldid=29006”