Complete this program, by adding a function called mag( ) to calculate the magnitude of a vector. You'll need to add a prototype before main( ), and the implementation (header & body) of the function after main( );

reminder: mag = sqrt (x ² + y ²)

Calling it with something like:

vec_length = mag(x, y);

int main(void) { double x = 0; double y = 0; double v=3.0, w=4.0; double m; cout << "Please enter the X coordinate: "; cin >> x; cout << "Please enter the Y coordinate: "; cin >> y; m = mag(x,y); // you need to write this function! cout << "The magnitude of ( "<< x << " , "<< y <<" ) is: " << m << endl; m = mag(v,w); // now get the magnitude of vector (v,w) cout << "The magnitude of ( "<< v << " , "<< w <<" ) is: " << m << endl; return 0; } //.................put your mag function here................... // be sure to add comments describing the inputs and outputs so a reader would // know how to use it.