fdim()

The fdim() function returns the positive difference between two arguments.

cmath library must be added at the top of the file.

std:fdim(x, y)

If the first argument is greater than the second argument fdim() returns the first argument minus the second argument, otherwise it returns zero.

double result1;
double result2;

result1 = std::fdim(6, 2); // 4
result2 = std::fdim(4, 8); // 0

Use fdim() to return the positive difference between 8 and 5:

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