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float fdim( float x, float y );
 (1) ( C++11)
double fdim( double x, double y );
 (2) ( C++11)
long double fdim( long double x, long double y );
 (3) ( C++11)
Promoted fdim( Arithmetic x, Arithmetic y );
 (4) ( C++11)
x y.
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Returns the positive difference between x and y.
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fmax (x - y, 0), x y, 0, x - y.
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This could be implemented as fmax (x - y, 0), so if x y, the result is always equals to 0, otherwise it is x - y.
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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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x, y
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floating point value
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The positive difference value.
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