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std::fdim

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

Returns the positive difference between x and y. 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.

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.

Parameters

x, y - floating point value

Return value

The positive difference value.

See also

computes absolute value of an integral value (|x|)
(function) [edit]
(C++11)
larger of two floating point values
(function) [edit]