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std::remquo

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float remquo( float x, float y, int *quo );
 (1) ( C++11)
double remquo( double x, double y, int *quo );
 (2) ( C++11)
long double remquo( long double x, long double y, int *quo );
 (3) ( C++11)
Promoted remquo( Arithmetic x, Arithmetic y, int *quo );
 (4) ( C++11)
x/y remainder . , x/y quo.
:
Computes the remainder of the floating point division operation x/y as the remainder function does. Additionally, the sign and at least the three of the last bits of x/y will be stored in quo.
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- , double. long double, long double, double
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If any argument has integral type, it is cast to double. If any other argument is long double, then the return type is long double, otherwise it is double
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x, y
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floating point values
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quo
.. x/y
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pointer to an integer value to store some bits of x/y in
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remainder of dividing arguments
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: sin(x) x, std::sin , std::remquo, , .
:
This function is useful when implementing periodic functions with the period exactly representable as a floating-point value: when calculating sin(x) for a very large x, calling std::sin directly may result in a large error, but if the function argument is first reduced with std::remquo, the low-order bits of the quotient may be used to determine the sign and the remainder may be used to calculate the value with high precision.
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