std::fdim

From Cppreference

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Defined in header <cmath>
float       fdim( float x, float y );		(since C++11)
double      fdim( double x, double y );		(since C++11)
long double fdim( long double x, long double y );		(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.

[edit] Parameters

x, y

-

floating point value

[edit] Return value

The positive difference value.

[edit] See also

abs(int) labs llabs imaxabs (C++11)	computes absolute value of an integral value (|x|) (function)
fmax (C++11)	larger of two floating point values (function)