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std::remquo

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Revision as of 23:18, 31 May 2013 by P12bot (Talk | contribs)

 
 
 
Common mathematical functions
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Basic operations
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remquo
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Defined in header <cmath>
float       remquo( float x, float y, int *quo );
(1) (since C++11)
double      remquo( double x, double y, int *quo );
(2) (since C++11)
long double remquo( long double x, long double y, int *quo );
(3) (since C++11)
Promoted    remquo( Arithmetic x, Arithmetic y, int *quo );
(4) (since C++11)

Computes the remainder of the floating point division operation x/y as the Template:rlpt function does. Additionally, the sign and at least the three of the last bits of x/y will be stored in quo.

4) 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

Contents

Parameters

x, y - floating point values
quo - pointer to an integer value to store some bits of x/y in

Return value

remainder of dividing arguments

Notes

This function is useful when implementing periodic functions with the period exactly representable as a floating-point value: when calculating sin(πx) 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.

See also

(C++11)
signed remainder of the division operation
(function) [edit]
remainder of the floating point division operation
(function) [edit]
computes quotient and remainder of integer division
(function) [edit]