write a C++ programm that lets the user input a vector (of size n)

use following functions and implemt them later on in the main function...

double max(vector &v) -->finds the max value in the vector

double min(vector &v) -->finds the min value in the vector

double dotProduct(vector&v1,vector &v2) -->finds the dot product of two vectors vector product(vector&v, double d) -->finds the product of the digit and the vector

double norm(vector &v) -->finds the length of a vector

void normalize(vector &v) -->finds the normalized vector

where is it useful to use const reference parameters in here and why