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std::nextafter, std::nexttoward cppreference.com
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float nextafter( float from, float to );
 (1) ( C++11)
double nextafter( double from, double to );
 (2) ( C++11)
long double nextafter( long double from, long double to );
 (3) ( C++11)
Promoted nextafter( Arithmetic from, Arithmetic to );
 (4) ( C++11)
float nexttoward( float from, long double to );
 (5) ( C++11)
double nexttoward( double from, long double to );
 (6) ( C++11)
long double nexttoward( long double from, long double to );
 (7) ( C++11)
double nexttoward( Integral from, long double to );
 (8) ( C++11)
from to. from to, to .
:
Returns the next representable value of from in the direction of to. If from equals to to, to is returned.
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4)

- , double. long double, long double, double
:
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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from, to
:
floating point values
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from to.
:
the next representable value of from in the direction of to.
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