Need help writing this distance function in C++ below:

This distance() function computes the distance between two colours, a and b. If you look at these two colours as a three-dimensional vector, computing the distance between the two colours is the same as computing the distance between two points:

It is easiest to compute the corresponding subtractions in three distinct variables first, then square those values, sum them, and finally compute the sqrt. You will need to use a floating-point type (e.g., double or float) for these values to properly compute the distance.

When done writing this function, test it to be sure it works properly.

//////////////////////////////////////////////////////////////////////////Code Below/////////////////////////////////////////////////////////////////

#include // for std::sqrt #include // for std::array #include // for std::vector #include // for std::numeric_limits #include // for std::string #include // for std::istream #include // for std::ostream #include // for std::cin, std::cout #include // for std::transform

using namespace std; // place this after the #includes

struct rgb { unsigned char red; unsigned char green; unsigned char blue; };

istream& operator >>(istream& is, rgb& colour) { unsigned r, g, b; is >> r >> g >> b; if(r

ostream& operator (colour.red) (colour.green) (colour.blue); return os; } double distance(rgb const& a, rgb const& b) { //CODE HERE }